15 changed files with 554 additions and 921 deletions
--- a/fast-servo/linien-gateware/cores/adc.py
+++ b/fast-servo/linien-gateware/cores/adc.py
@ -20,15 +20,13 @@
 from migen import *
 from migen.genlib.cdc import MultiReg
 from misoc.interconnect.csr import AutoCSR, CSRStatus, CSRStorage
-from misoc.interconnect.stream import AsyncFIFO


-class CRG(Module):
+class _CRG(Module):
    def __init__(self, platform, dco_clk, dco_freq=200e6):
        self.clock_domains.cd_dco = ClockDomain()
        self.clock_domains.cd_dco2x = ClockDomain()
        self.clock_domains.cd_dco2d = ClockDomain()
-        self.clock_domains.cd_dco2d_45_degree = ClockDomain()
        dco_clk_p, dco_clk_n = dco_clk

        dco_clk_buf = Signal()
@ -43,83 +41,59 @@ class CRG(Module):
        clk_dco = Signal()
        clk_dco2x = Signal()
        clk_dco2d = Signal()
-        clk_dco2d_45_degree = Signal()
-        mmcm_ps_psdone = Signal()
-
        self.locked = Signal()
-        self.mmcm_rst = Signal()
-        self.ddr_clk_phase_shift_en = Signal()
-        self.ddr_clk_phase_incdec = Signal()

        platform.add_period_constraint(dco_clk_p, 1e9 / dco_freq)
        self.specials += [
            Instance(
-                "MMCME2_ADV",
+                "PLLE2_BASE",
                p_BANDWIDTH="OPTIMIZED",
                p_DIVCLK_DIVIDE=1,
                p_CLKFBOUT_PHASE=0.0,
-                p_CLKFBOUT_MULT_F=4,  # VCO @ 800 MHz
+                p_CLKFBOUT_MULT=4,  # VCO @ 800 MHz
                p_CLKIN1_PERIOD=(1e9 / dco_freq),
                p_REF_JITTER1=0.01,
                p_STARTUP_WAIT="FALSE",
                i_CLKIN1=dco_clk_buf,
                i_PWRDWN=0,
-                i_RST=ResetSignal("sys") | self.mmcm_rst,
+                i_RST=ResetSignal("sys"),
                i_CLKFBIN=clk_feedback_buf,
                o_CLKFBOUT=clk_feedback,
-
-                p_CLKOUT0_USE_FINE_PS="TRUE",
-                p_CLKOUT0_DIVIDE_F=8,
-                p_CLKOUT0_PHASE=45.0,
+                p_CLKOUT0_DIVIDE=4,
+                p_CLKOUT0_PHASE=0.0,
                p_CLKOUT0_DUTY_CYCLE=0.5,
-                o_CLKOUT0=clk_dco2d_45_degree,  # 100 MHz <- dco_clk / 2 = 200 MHz / 2
-                o_LOCKED=self.locked,
-
+                o_CLKOUT0=clk_dco,  # 200 MHz <- dco_clk
                p_CLKOUT1_DIVIDE=2,
                p_CLKOUT1_PHASE=0.0,
                p_CLKOUT1_DUTY_CYCLE=0.5,
                o_CLKOUT1=clk_dco2x,  # 400 MHZ <- 2 * dco_clk = 2*200 MHz
-                
                p_CLKOUT2_DIVIDE=8,
                p_CLKOUT2_PHASE=0.0,
                p_CLKOUT2_DUTY_CYCLE=0.5,
                o_CLKOUT2=clk_dco2d,  # 100 MHz <- dco_clk / 2 = 200 MHz / 2
-                
-                p_CLKOUT3_DIVIDE=4,
-                p_CLKOUT3_PHASE=0.0,
-                p_CLKOUT3_DUTY_CYCLE=0.5,
-                o_CLKOUT3=clk_dco,  # 200 MHz <- dco_clk
-
-                i_PSCLK=ClockSignal(),
-                i_PSEN=self.ddr_clk_phase_shift_en,
-                i_PSINCDEC=self.ddr_clk_phase_incdec,
-                o_PSDONE=mmcm_ps_psdone,
+                o_LOCKED=self.locked,
            )
        ]

        self.specials += Instance("BUFG", i_I=clk_feedback, o_O=clk_feedback_buf)
        self.specials += Instance("BUFG", i_I=clk_dco, o_O=self.cd_dco.clk)
        self.specials += Instance("BUFG", i_I=clk_dco2d, o_O=self.cd_dco2d.clk)
-        self.specials += Instance("BUFG", i_I=clk_dco2d_45_degree, o_O=self.cd_dco2d_45_degree.clk)
        self.specials += Instance("BUFG", i_I=clk_dco2x, o_O=self.cd_dco2x.clk)

-        # Ignore dco2d to mmcm dco_clk path created by SoC's rst.
-        platform.add_false_path_constraints(self.cd_dco2d.clk, dco_clk_buf)
-        self.specials += Instance("FD", p_INIT=1, i_D=~self.locked, i_C=self.cd_dco2d.clk, o_Q=self.cd_dco2d.rst)

 class ADC(Module, AutoCSR):
    def __init__(self, platform, dco_freq=200e6):
        adc_pads = platform.request("adc")
        afe_pads = platform.request("adc_afe")

-        self.frame_csr = CSRStatus(5)
+        self.frame_csr = CSRStatus(4)
        self.data_ch0 = CSRStatus(16)
        self.data_ch1 = CSRStatus(16)

        self.tap_delay = CSRStorage(5)
        self.bitslip_csr = CSRStorage(1)

-        self.afe_ctrl = CSRStorage(7)
+        self.afe_ctrl = CSRStorage(4)

        tap_delay_val = Signal(5)
        bitslip = Signal()
@ -131,17 +105,7 @@ class ADC(Module, AutoCSR):
        ch2_shdn = Signal()

        self.data_out = [Signal(16, reset_less=True), Signal(16, reset_less=True)]
-        self.data_out_cdc = [Signal(16, reset_less=True), Signal(16, reset_less=True)]
        self.s_frame = Signal(4)
-        self.s_frame_cdc = Signal(4)
-
-        self.submodules.cdc_fifo = ClockDomainsRenamer({"write": "dco2d", "read": "sys"})(AsyncFIFO([("data", 36)], 4))
-        self.comb += [
-            self.cdc_fifo.sink.data.eq(Cat(self.data_out_cdc[0], self.data_out_cdc[1], self.s_frame_cdc)),
-            self.cdc_fifo.sink.stb.eq(~ResetSignal("dco2d")),
-            Cat(self.data_out[0], self.data_out[1], self.s_frame).eq(self.cdc_fifo.source.data),
-            self.cdc_fifo.source.ack.eq(~ResetSignal("sys")),
-        ]

        ###

@ -153,14 +117,11 @@ class ADC(Module, AutoCSR):
            # dco_clk.n.eq(adc_pads.dco_n),
            tap_delay_val.eq(self.tap_delay.storage),
            Cat(ch1_gain_x10, ch2_gain_x10, ch1_shdn, ch2_shdn).eq(
-                self.afe_ctrl.storage[0:4]
+                self.afe_ctrl.storage
            ),
        ]

-        self.submodules.crg = CRG(platform, dco_clk, dco_freq)
-        self.comb += self.afe_ctrl.storage[4].eq(self.crg.mmcm_rst)
-        self.comb += self.afe_ctrl.storage[5].eq(self.crg.ddr_clk_phase_shift_en)
-        self.comb += self.afe_ctrl.storage[6].eq(self.crg.ddr_clk_phase_incdec)
+        self.submodules._crg = _CRG(platform, dco_clk, dco_freq)

        self.specials += MultiReg(self.bitslip_csr.re, bitslip_re_dco_2d, "dco2d")
        self.sync.dco2d += [
@ -168,8 +129,7 @@ class ADC(Module, AutoCSR):
        ]

        self.comb += [
-            self.frame_csr.status[0:4].eq(self.s_frame[0:4]),
-            self.frame_csr.status[4].eq(self.crg.locked),
+            self.frame_csr.status.eq(self.s_frame),
            self.data_ch0.status.eq(self.data_out[0]),
            self.data_ch1.status.eq(self.data_out[1]),
        ]
@ -186,7 +146,7 @@ class ADC(Module, AutoCSR):

        self.specials += Instance(
            "LTC2195",
-            i_rst_in=ResetSignal("dco2d"),
+            i_rst_in=ResetSignal("sys"),
            i_clk200=ClockSignal("idelay"),
            i_DCO=ClockSignal("dco"),
            i_DCO_2D=ClockSignal("dco2d"),
@ -198,9 +158,9 @@ class ADC(Module, AutoCSR):
            i_D1_in_n=adc_pads.data1_n,
            i_bitslip=bitslip,
            i_delay_val=tap_delay_val,
-            o_ADC0_out=self.data_out_cdc[1],        # LANES swapped on hardware
-            o_ADC1_out=self.data_out_cdc[0],
-            o_FR_out=self.s_frame_cdc,
+            o_ADC0_out=self.data_out[1],        # LANES swapped on hardware
+            o_ADC1_out=self.data_out[0],
+            o_FR_out=self.s_frame,
            o_o_data_from_pins=dummy,
            o_idelay_rdy=dummy_idelay_rdy,
        )
--- a/fast-servo/linien-gateware/cores/dac.py
+++ b/fast-servo/linien-gateware/cores/dac.py
@ -20,7 +20,6 @@
 from migen import *
 from misoc.interconnect.csr import AutoCSR, CSRStorage
 from migen.genlib.io import DDROutput
-from misoc.interconnect.stream import AsyncFIFO


 class DAC(Module, AutoCSR):
@ -39,51 +38,37 @@ class DAC(Module, AutoCSR):
        output_data_ch1 = Signal(14)

        self.data_in = [Signal(14, reset_less=True), Signal(14, reset_less=True)]
-        self.data_in_csr = [Signal(14, reset_less=True), Signal(14, reset_less=True)]
-        
-        self.data_in_cdc = [Signal(14, reset_less=True), Signal(14, reset_less=True)]
-        self.data_in_csr_cdc = [Signal(14, reset_less=True), Signal(14, reset_less=True)]
        platform.add_period_constraint(dac_pads.dclkio, 10.0)

-        self.submodules.cdc_fifo = ClockDomainsRenamer({"write": "sys", "read": "dco2d"})(AsyncFIFO([("data", 56)], 4))
-        self.comb += [
-            self.data_in_csr[0].eq(self.output_value_ch0.storage), 
-            self.data_in_csr[1].eq(self.output_value_ch1.storage),
-            self.cdc_fifo.sink.data.eq(Cat(self.data_in[0], self.data_in[1], self.data_in_csr[0], self.data_in_csr[1])),
-            self.cdc_fifo.sink.stb.eq(~ResetSignal("sys")),
-            Cat(self.data_in_cdc[0], self.data_in_cdc[1], self.data_in_csr_cdc[0], self.data_in_csr_cdc[1]).eq(self.cdc_fifo.source.data),
-            self.cdc_fifo.source.ack.eq(~ResetSignal("dco2d")),
-        ]
-
        self.comb += [
            Cat(manual_override, ch0_pd, ch1_pd).eq(self.dac_ctrl.storage),
-            dac_pads.rst.eq(ResetSignal("dco2d")),
+            dac_pads.rst.eq(ResetSignal("sys")),
            dac_afe_pads.ch1_pd_n.eq(~ch0_pd),
            dac_afe_pads.ch2_pd_n.eq(~ch1_pd),
            output_data_ch0.eq(
-                Mux(manual_override, self.data_in_csr_cdc[0], self.data_in_cdc[0])
+                Mux(manual_override, self.output_value_ch0.storage, self.data_in[0])
            ),
            output_data_ch1.eq(
-                Mux(manual_override, self.data_in_csr_cdc[1], self.data_in_cdc[1])
+                Mux(manual_override, self.output_value_ch1.storage, self.data_in[1])
            ),
        ]

-        self.specials += [
-            Instance("ODDR", 
-                i_C=ClockSignal("dco2d"), 
-                i_CE=~ResetSignal("dco2d"), 
-                i_D1=output_data_ch0[lane], # DDR CLK Rising Edge
-                i_D2=output_data_ch1[lane], # DDR CLK Falling Edge
-                o_Q=dac_pads.data[lane],
-                p_DDR_CLK_EDGE="SAME_EDGE") 
-            for lane in range(14)]
-        self.specials += Instance("ODDR", 
-                i_C=ClockSignal("dco2d_45_degree"), 
-                i_CE=~ResetSignal("dco2d"), 
-                i_D1=0, 
-                i_D2=1, 
-                o_Q=dac_pads.dclkio,
-                p_DDR_CLK_EDGE="SAME_EDGE")
+        # data
+        for lane in range(14):
+            self.specials += DDROutput(
+                i1 = output_data_ch0[lane], 
+                i2 = output_data_ch1[lane], 
+                o = dac_pads.data[lane], 
+                clk = ClockSignal("dco2d")
+            )
+        
+        # clock forwarding
+        self.specials += DDROutput(
+            i1 = 0b0,
+            i2 = 0b1,
+            o = dac_pads.dclkio,
+            clk = ClockSignal("dco2d"),
+        )


 class AUX_DAC_CTRL(Module, AutoCSR):
--- a/fast-servo/linien-gateware/fast_servo_soc.py
+++ b/fast-servo/linien-gateware/fast_servo_soc.py
@ -147,7 +147,6 @@ class BaseSoC(PS7, AutoCSR):
        # self.add_main_adc(platform)
        self.submodules.adc = ADC(platform)
        self.csr_devices.append("adc")
-        platform.add_false_path_constraints(self.crg.cd_sys.clk, self.adc.crg.cd_dco2d.clk)

        # self.add_main_dac(platform)
        self.submodules.dac = DAC(platform)
--- a/fast-servo/linien-pyrp3-monitor.patch
+++ b/fast-servo/linien-pyrp3-monitor.patch
@ -1,141 +0,0 @@
-# Fix for bus error issues when compiling cpython extensions in pyrp3 v1.2.0+
-# Patch sourced from: https://github.com/linien-org/pyrp3/tree/e6688acf8bd79d2dbe1d192d09c1a1baf1f6c67b (setup.py & monitor/Makefile)
-# Reference: https://github.com/elhep/Fast-Servo-Firmware/blob/master/OS/scripts/linien_install_requirements.sh#L28
-
-diff --git a/monitor/Makefile b/monitor/Makefile
-new file mode 100644
-index 0000000..044d88e
--- /dev/null
-+++ b/monitor/Makefile
-@@ -0,0 +1,31 @@
-+# Makefile for libmonitor
-+
-+OBJS = monitor.o
-+SRCS = $(subst .o,.c, $(OBJS))
-+OSOBJS = monitor.os
-+TARGETLIB=libmonitor.so
-+CFLAGS=-g -std=gnu99 -Wall -Werror
-+LIBS=-lm -lpthread
-+
-+# Use CROSS_COMPILE=arm-linux-gnueabi-
-+CC=$(CROSS_COMPILE)gcc
-+INSTALL_DIR ?= .
-+
-+
-+all: $(TARGETLIB)
-+lib: $(TARGETLIB)
-+
-+%.os: %.c
-+	$(CC) -c -fPIC $(CFLAGS) $< -o $@
-+
-+$(TARGETLIB): $(OSOBJS)
-+	$(CC) -o $@ -shared $^ $(CFLAGS) $(LIBS)
-+
-+clean:
-+	rm -f $(TARGETLIB) *.o *.os
-+
-+# Install target - creates 'lib/' sub-directory in $(INSTALL_DIR) and copies all
-+# executables to that location.
-+install:
-+	mkdir -p $(INSTALL_DIR)/lib
-+	cp $(TARGETLIB) $(INSTALL_DIR)/lib
-\ No newline at end of file
-diff --git a/pyrp3/raw_memory.py b/pyrp3/raw_memory.py
-index ce1b28e..233b82a 100644
--- a/pyrp3/raw_memory.py
-+++ b/pyrp3/raw_memory.py
-@@ -1,12 +1,9 @@
- from ctypes import POINTER, c_uint32, cast, cdll, create_string_buffer, sizeof
-from importlib.machinery import EXTENSION_SUFFIXES
- from pathlib import Path
- 
- import numpy as np
- 
-libmonitor_file = str(
-    Path(__file__).parent / ".." / "monitor{}".format(EXTENSION_SUFFIXES[0])
-)
-+libmonitor_file = 'libmonitor.so'
- 
- libmonitor = cdll.LoadLibrary(libmonitor_file)
- libmonitor.read_value.restype = c_uint32
-diff --git a/setup.py b/setup.py
-index 98bdaee..b0a8af4 100644
--- a/setup.py
-+++ b/setup.py
-@@ -1,5 +1,10 @@
- import re
-from distutils.core import Extension, setup
-+import os
-+
-+from distutils.core import setup
-+from distutils.command.build import build
-+from distutils.command.install import install
-+
- from pathlib import Path
- 
- # from https://stackoverflow.com/a/7071358/2750945
-@@ -11,9 +16,50 @@ if mo:
-     verstr = mo.group(1)
- else:
-     raise RuntimeError("Unable to find version string in %s." % (VERSIONFILE,))
-+
-+# Patch from https://github.com/linien-org/pyrp3/blob/e6688acf8bd79d2dbe1d192d09c1a1baf1f6c67b/setup.py#L16-L55
-+build_dir = "monitor/"
-+
-+def compile_libmonitor():
-+    cwd = os.getcwd()  # get current directory
-+    try:
-+        os.chdir(build_dir)
-+        os.system("make clean")
-+        os.system("make all")
-+    finally:
-+        os.chdir(cwd)
-+
-+
-+def install_libmonitor(prefix=""):
-+    cwd = os.getcwd()  # get current directory
-+    try:
-+        os.chdir(build_dir)
-+        os.system("make install INSTALL_DIR={prefix}".format(prefix=prefix))
-+    finally:
-+        os.chdir(cwd)
-+
-+
-+class lib_build(build):
-+    def run(self):
-+        compile_libmonitor()
-+        build.run(self)
-+
-+
-+class lib_install(install):
-+    def run(self):
-+        compile_libmonitor()
-+        install_libmonitor(self.prefix)
-+        # install.run(self)
-+
-+# Will use nix to install libmonitor
-+cmdclass = {
-+    "build": lib_build
-+}
-+
- this_directory = Path(__file__).parent
- long_description = (this_directory / "README.rst").read_text()
- 
-+
- setup(
-     name="pyrp3",
-     version=verstr,
-@@ -32,6 +78,7 @@ setup(
-         "cached_property>=1.5.2",
-         "numpy>=1.11.0",
-     ],
-+    cmdclass=cmdclass,
-     classifiers=[
-         "Intended Audience :: Developers",
-         "Intended Audience :: Education",
-@@ -45,5 +92,4 @@ setup(
-         "Topic :: Software Development :: Libraries :: Python Modules",
-     ],
-     keywords=["redpitaya", "FPGA", "zynq"],
-    ext_modules=[Extension("monitor", ["monitor/monitor.c"])],
- )
--- a/fast-servo/pyfastservo/adc.py
+++ b/fast-servo/pyfastservo/adc.py
@ -17,9 +17,11 @@
 # You should have received a copy of the GNU General Public License
 # along with this program. If not, see <https://www.gnu.org/licenses/>.

-import time
+import mmap
+import os
+
 import spidev
-from pyfastservo.common import (
+from common import (
    ADC_AFE_CTRL_ADDR,
    ADC_BITSLIP_ADDR,
    ADC_CH0_HIGH_ADDR,
@ -31,8 +33,6 @@ from pyfastservo.common import (
    AUX_ADC_ADDR,
    MAP_MASK,
    PAGESIZE,
-    write_to_memory,
-    read_from_memory
 )

 # /dev/spidev1.0  <=> spidev<BUS>.<DEVICE>
@ -44,181 +44,276 @@ AUX_ADC_PORT_A = 2
 AUX_ADC_PORT_B = 3


-def spi_write(spi, address, value):
-    spi.xfer2([address, value])
-
-def spi_read(spi, address):
-    rx_buffer = spi.xfer2([0x80 | address, 0x00])
-    return rx_buffer[1]
-
-def main_adc_config(spi, test_pattern):
+def main_adc_config(test_pattern):
    high_word = (test_pattern & 0xFF00) >> 8
    low_word = test_pattern & 0xFF

-    spi_write(spi, 0x00, 0x80)              # reset
-    spi_write(spi, 0x01, 0x20)              # REGISTER A1: set to Two's complement Data Format
-    spi_write(spi, 0x02, 0x15)              # REGISTER A2: set to LVDS output, set 4 data lanes and turn on test mode
-    spi_write(spi, 0x03, high_word)         # REGISTER A3: test pattern high word
-    spi_write(spi, 0x04, low_word)          # REGISTER A4: test pattern low word
-
-def main_adc_test_mode(spi, enable):
-    reg_contents = 0x15 if enable else 0x11 # set to LVDS output, set 4 data lanes and turn on or off test mode
-    spi_write(spi, 0x02, reg_contents)
-
-def verify_adc_registers(spi, reg_to_check):
-    for register, expected_value in reg_to_check.items():
-        value = spi_read(spi, register)
-        print(f"Spi readback register 0x{register:02x}: 0x{value:02x}")
-        if value != expected_value:
-            print(f"Different value read than sent in reg 0x{register:02x}")
-
-def read_frame():
-    return read_from_memory(ADC_FRAME_ADDR, 1)[0]
-
-def perform_bitslip():
-    for i in range(4):
-        current_frame = read_frame()
-        if current_frame & 0x0F != 0x0C:
-            print(f"Performing bitslip (iteration: {i}). Current frame: 0x{current_frame:02x}")
-            write_to_memory(ADC_BITSLIP_ADDR, 1)
-        else:
-            print(f"No bitslip required; Current frame: 0x{current_frame:02x}")
-            return
-
-def mmcm_rst():
-    curr_cfg = read_from_memory(ADC_AFE_CTRL_ADDR, 1)[0] & 0x0F
-    write_to_memory(ADC_AFE_CTRL_ADDR, 0x10 | curr_cfg) # Reset MMCM
-    write_to_memory(ADC_AFE_CTRL_ADDR, 0x00 | curr_cfg) # Release MMCM Reset
-    while not(read_frame() & 0x10):
-        print(f"Waiting for MMCM to lock")
-        time.sleep(0.001)
-
-def inc_ddr_clk_phase():
-    curr_cfg = read_from_memory(ADC_AFE_CTRL_ADDR, 1)[0] & 0x1F
-    write_to_memory(ADC_AFE_CTRL_ADDR, 0x40 | curr_cfg) # Set MMCM Phase Shift to be INC
-    write_to_memory(ADC_AFE_CTRL_ADDR, 0x60 | curr_cfg) # Assert MMCM Phase Shift EN High
-    write_to_memory(ADC_AFE_CTRL_ADDR, curr_cfg)        # Deassert MMCM Phase Shift EN High
-
-def dec_ddr_clk_phase():
-    curr_cfg = read_from_memory(ADC_AFE_CTRL_ADDR, 1)[0] & 0x1F
-    write_to_memory(ADC_AFE_CTRL_ADDR, 0x00 | curr_cfg) # Set MMCM Phase Shift to be DEC
-    write_to_memory(ADC_AFE_CTRL_ADDR, 0x20 | curr_cfg) # Assert MMCM Phase Shift EN High
-    write_to_memory(ADC_AFE_CTRL_ADDR, curr_cfg)        # Deassert MMCM Phase Shift EN High
-
-def find_edge():
-    prev_frame = read_frame()
-    for tap_delay in range(32):
-        write_to_memory(ADC_DELAY_ADDR, tap_delay)
-        current_frame = read_frame()
-
-        print(f"Tap delay: {tap_delay}, Current frame: 0x{current_frame:02x}")
-        print(f"prev_frame: 0x{prev_frame:02x}")
-
-        if current_frame != prev_frame:
-            final_delay = ((tap_delay+1) // 2) + 2
-            print(f"Edge detected; setting iDelay to: {final_delay}")
-            write_to_memory(ADC_DELAY_ADDR, final_delay)
-            return
-
-        prev_frame = current_frame
-
-    # If no edge detected
-    final_delay = 11
-    print(f"No edge detected; setting iDelay to: {final_delay}")
-    write_to_memory(ADC_DELAY_ADDR, final_delay)
-
-def read_adc_channel(high_addr, low_addr):
-    return (read_from_memory(high_addr, 1)[0] << 8) | read_from_memory(low_addr, 1)[0]
-
-def print_adc_channels():
-    adc_ch0 = read_adc_channel(ADC_CH0_HIGH_ADDR, ADC_CH0_LOW_ADDR)
-    adc_ch1 = read_adc_channel(ADC_CH1_HIGH_ADDR, ADC_CH1_LOW_ADDR)
-    print(f"Final ADC_CH0: 0x{adc_ch0:04x}")
-    print(f"Final ADC_CH1: 0x{adc_ch1:04x}")
-
-def enable_adc_afe(ch1_x10=False, ch2_x10=False):
-    ctrl_value = (ch2_x10 << 1) | ch1_x10
-    write_to_memory(ADC_AFE_CTRL_ADDR, ctrl_value)
-    afe_ctrl = read_from_memory(ADC_AFE_CTRL_ADDR, 1)[0]
-    print(f"ADC_AFE_CTRL: 0x{afe_ctrl:02X}")
-    return afe_ctrl
-
-def search_edge():
-    for tap_delay in range(32):
-        print(f"iDelay to: {tap_delay}")
-        write_to_memory(ADC_DELAY_ADDR, tap_delay)
-        time.sleep(1)
-        current_frame = read_frame()
-        print(f"Tap delay: {tap_delay}, Current frame: 0x{current_frame:02x}")
-        print_adc_channels()
-
-def print_adc_channel(ch):
-    if ch == 0:
-        adc_ch0 = read_adc_channel(ADC_CH0_HIGH_ADDR, ADC_CH0_LOW_ADDR)
-        print(f"Final ADC_CH0: 0x{adc_ch0:04x}")
-    if ch == 1:
-        adc_ch1 = read_adc_channel(ADC_CH1_HIGH_ADDR, ADC_CH1_LOW_ADDR)
-        print(f"Final ADC_CH1: 0x{adc_ch1:04x}")
-
-def find_min_max_ch(ch):
-    test = []
-    for i in range(100):
-        if ch == 0:
-            test.append(read_adc_channel(ADC_CH0_HIGH_ADDR, ADC_CH0_LOW_ADDR))
-        else:
-            test.append(read_adc_channel(ADC_CH1_HIGH_ADDR, ADC_CH1_LOW_ADDR)) 
-        print("ch", ch, hex(test[-1]))
-    print("Min:", hex(min(test)))
-    print("Max:", hex(max(test)))
-    print("Diff:", hex(max(test)-min(test)))
-
-
-def configure_ltc2195():
    spi = spidev.SpiDev()
+
    try:
        spi.open(MAIN_ADC_BUS, MAIN_ADC_DEVICE)
        spi.max_speed_hz = 50000
        spi.mode = 0b00  # CPOL = 0 CPHA = 0
-        spi.cshigh = False
+        spi.cshigh = True
+        # spi.read0 = False

-        test_pattern = 0x811F
-        main_adc_config(spi, test_pattern)
+        spi_buffer = [0x00, 0x80]  # reset
+        rx_buffer = [0x00, 0x00]

-        verify_adc_registers(spi, {
-            0x01: 0x20,
-            0x02: 0x15,
-            0x03: (test_pattern & 0xFF00) >> 8,
-            0x04: test_pattern & 0xFF
-        })
+        spi.xfer2(spi_buffer)

-        # ADC software reset put its PLL to sleep momentarily. Thus, MMCM needs to be reset as well.
-        mmcm_rst()
+        # REGISTER A1
+        spi_buffer = [0x01, 0x20]  # set to Two's complement Data Format
+        spi.xfer2(spi_buffer)

-        # Performing Word Align
-        perform_bitslip()
-        find_edge()
+        # read values back
+        spi_buffer = [0x81, 0x00]
+        rx_buffer = spi.xfer2(spi_buffer)
+        print(f"Spi readback register 0x01: 0x{rx_buffer[1]:02x}")
+        if rx_buffer[1] != 0x20:
+            print("Different value read than sent in reg 0x02")

-        # Printing it once is not enough to check whether the alignment is correct.
-        for i in range(100):
-            print_adc_channels()
+        # REGISTER A2
+        spi_buffer = [
+            0x02,
+            0x15,
+        ]  # set to LVDS output, set 4 data lanes and turn on test mode
+        spi.xfer2(spi_buffer)

-        main_adc_test_mode(spi, False)
-        verify_adc_registers(spi, {0x02: 0x11})  # Verify test mode is off
+        # read values back
+        spi_buffer = [0x82, 0x00]
+        rx_buffer = spi.xfer2(spi_buffer)
+        print(f"Spi readback register 0x02: 0x{rx_buffer[1]:02x}")
+        if rx_buffer[1] != 0x15:
+            print("Different value read than sent in reg 0x02")

-        # FIXME: AFE Gain 1x is not functional on that batch of fast servo under development
-        enable_adc_afe(ch1_x10=1, ch2_x10=1)
+        # REGISTER A3
+        # test pattern high word
+        spi_buffer = [0x03, high_word]
+        spi.xfer2(spi_buffer)

-        #find_min_max_ch(0)
-        #find_min_max_ch(1)
+        # read balues back
+        spi_buffer = [0x83, 0x00]
+        rx_buffer = spi.xfer2(spi_buffer)
+        print(f"Spi readback register 0x03: 0x{rx_buffer[1]:02x}")
+        if rx_buffer[1] != high_word:
+            print("Different value read than sent in reg 0x03")

-        #for i in range(10):
-        #    print_adc_channel(0)
+        # REGISTER A4
+        # test pattern low word
+        spi_buffer = [0x04, low_word]
+        spi.xfer2(spi_buffer)

-        #for i in range(10):
-        #    print_adc_channel(1)
+        # read balues back
+        spi_buffer = [0x84, 0x00]
+        rx_buffer = spi.xfer2(spi_buffer)
+        print(f"Spi readback register 0x04: 0x{rx_buffer[1]:02x}")
+        if rx_buffer[1] != low_word:
+            print("Different value read than sent in reg 0x04")
+    finally:
+        spi.close()
+
+
+def main_adc_test_mode(enable):
+    spi = spidev.SpiDev()
+
+    try:
+        spi.open(MAIN_ADC_BUS, MAIN_ADC_DEVICE)
+        spi.max_speed_hz = 50000
+        spi.mode = 0b00  # CPOL = 0 CPHA = 0
+        spi.cshigh = True
+        # spi.read0 = True
+
+        reg_contents = (
+            0x15 if enable else 0x11
+        )  # set to LVDS output, set 4 data lanes and turn on or off test mode
+        spi_buffer = [0x02, reg_contents]
+        spi.xfer2(spi_buffer)
+
+        # read values back
+        spi_buffer = [0x82, 0x00]
+        rx_buffer = spi.xfer2(spi_buffer)
+        print(f"Spi readback register 0x02: 0x{rx_buffer[1]:02x}")
+        if rx_buffer[1] != reg_contents:
+            print("Different value read than sent in reg 0x02")
+    finally:
+        spi.close()
+
+
+def read_from_memory(address, n_bytes):
+    assert n_bytes <= 4
+    addr = address
+
+    try:
+        f = os.open("/dev/mem", os.O_SYNC | os.O_RDWR)
+        with mmap.mmap(
+            f,
+            PAGESIZE,
+            mmap.MAP_SHARED,
+            mmap.PROT_READ | mmap.PROT_WRITE,
+            offset=addr & ~MAP_MASK,
+        ) as mem:
+            start_addr = addr & MAP_MASK
+            stop_addr = start_addr + 4
+            # print(f"addr: 0x{addr:x}\tstart_addr: 0x{start_addr}\tstop_addr: 0x{stop_addr}")
+            contents = mem[start_addr:stop_addr]
+            read_value = list(contents)[:n_bytes]
+            # print("Read value: ", read_value)
+    finally:
+        os.close(f)
+
+    return read_value
+
+
+def write_to_memory(address, value):
+    value_bytes = value.to_bytes(4, "little")
+    addr = address
+
+    try:
+        f = os.open("/dev/mem", os.O_SYNC | os.O_RDWR)
+        with mmap.mmap(
+            f,
+            PAGESIZE,
+            mmap.MAP_SHARED,
+            mmap.PROT_READ | mmap.PROT_WRITE,
+            offset=addr & ~MAP_MASK,
+        ) as mem:
+            start_addr = addr & MAP_MASK
+            stop_addr = start_addr + 4
+            # print(f"addr: 0x{addr:x}\tstart_addr: 0x{start_addr}\tstop_addr: 0x{stop_addr}")
+            mem[start_addr:stop_addr] = value_bytes
+            contents = mem[start_addr:stop_addr]
+            # print("Read value: ", list(contents), " written value: ", list(value_bytes))
+    finally:
+        os.close(f)
+
+
+def word_align():
+
+    value = 0
+    edge_detected = False
+    transition = False
+    tap_delay = 0
+
+    for i in range(4):
+        current_frame = read_from_memory(ADC_FRAME_ADDR, 1)[0]
+        if current_frame != 0x0C:
+            print(
+                f"Performing bitslip (bitslip iteration: {i}). Reason: current_frame is 0x{current_frame:02x} instead of 0x0C"
+            )
+            write_to_memory(ADC_BITSLIP_ADDR, 1)
+        else:
+            print(f"No bitslip required; Currernt frame = 0x{current_frame:02x}")
+            break
+
+    current_frame = read_from_memory(ADC_FRAME_ADDR, 1)[0]
+    prev_frame = current_frame
+
+    for i in range(32):
+        write_to_memory(ADC_DELAY_ADDR, tap_delay)
+        if edge_detected == 1:
+            break
+        current_frame = read_from_memory(ADC_FRAME_ADDR, 1)[0]
+
+        print(f"Tap delay: {tap_delay}")
+        print(f"Current frame: 0x{current_frame:02x}")
+
+        if current_frame == prev_frame:
+            tap_delay += 1
+        elif not transition:
+            tap_delay += 1
+            transition = True
+        elif transition:
+            tap_delay = i // 2
+            edge_detected = True
+
+        prev_frame = current_frame
+
+    if not edge_detected:
+        tap_delay = 11  # empirically tested to work best
+        write_to_memory(ADC_DELAY_ADDR, tap_delay)
+        print(f"No edge detected; setting iDelay to: {tap_delay}")
+    if edge_detected:
+        write_to_memory(ADC_DELAY_ADDR, tap_delay + 2)
+        print(f"Edge detected; setting iDelay to (tap_delay + 2): {tap_delay} + 2")
+
+    adc_ch0 = read_from_memory(ADC_CH0_HIGH_ADDR, 4)
+    print(f"ADC_CH0: 0x{adc_ch0}")
+
+    adc_ch0 = (read_from_memory(ADC_CH0_HIGH_ADDR, 1)[0] << 8) | read_from_memory(
+        ADC_CH0_LOW_ADDR, 1
+    )[0]
+    adc_ch1 = (read_from_memory(ADC_CH1_HIGH_ADDR, 1)[0] << 8) | read_from_memory(
+        ADC_CH1_LOW_ADDR, 1
+    )[0]
+    print(f"Final ADC_CH0: 0x{adc_ch0:04x}")
+    print(f"Final ADC_CH1: 0x{adc_ch1:04x}")
+
+
+def modify_bit(original_value, position, bit_value):
+    mask = 1 << position
+    return (original_value & ~mask) | (bit_value << position)
+
+
+def adc_aux_config():
+    # MSB to LSB
+    # | RANGE | ADDR [2:0] | DIFF |
+    #       DIFF = 0    =>  configure as single ended (it is negated in gateware)
+    #       RANGE = 0   =>  configure as 0-2.5 Vref
+    to_write = 0b00000
+    write_to_memory(AUX_ADC_ADDR, to_write)
+
+
+def adc_aux_read(port, type, pin):
+    # port:
+    #   1 - port A
+    #   2 - port B
+    # type:
+    #   0 - single-ended
+    #   1 - differential
+    # pin:
+    #   0b000   - VA1/VB1
+    #   0b001   - VA2/VB2
+    #   0b010   - VA3/VB3
+    #   0b011   - VA4/VB4
+
+    assert type in (0, 1)
+    assert port in (1, 2)
+
+    write_buffer = [0, 0]
+    read_buffer = [0, 0]
+
+    aux_config_reg = read_from_memory(AUX_ADC_ADDR, 1)[0]
+    aux_config = (aux_config_reg & 0b10001) | pin << 1
+    write_to_memory(AUX_ADC_ADDR, aux_config)
+
+    spi = spidev.SpiDev()
+    try:
+        spi.open(1, 3)  # AUX ADC 1?
+        spi.max_speed_hz = 5000
+        spi.mode = 0b00
+        spi.cshigh = True
+
+        read_buffer = spi.xfer2(write_buffer)
+        mu_voltage = read_buffer[0] << 8 | read_buffer[1] >> 2
+        print(f"MU_voltage: 0x{mu_voltage:04X}")
+        print(f"Read_buffer[0]: 0x{read_buffer[0]:02X}")
+        print(f"Read_buffer[1]: 0x{read_buffer[1]:02X}")
+        return mu_voltage * 2.5 / 4096

    finally:
        spi.close()

+
+def main():
+    main_adc_config(0x811F)
+    word_align()
+
+    main_adc_test_mode(False)
+
+    write_to_memory(ADC_AFE_CTRL_ADDR, 0b1100) # {-, -, ch2_X10, ch1_X10}
+    print(read_from_memory(ADC_AFE_CTRL_ADDR, 1)[0])
+
+
 if __name__ == "__main__":
-    configure_ltc2195()
+    main()
--- a/fast-servo/pyfastservo/common.py
+++ b/fast-servo/pyfastservo/common.py
@ -17,16 +17,13 @@
 # You should have received a copy of the GNU General Public License
 # along with this program. If not, see <https://www.gnu.org/licenses/>.

-import os
-import mmap
-
 CSR_SIZE = 0x800
 MAP_SIZE = 0x1000
 MAP_MASK = 0xFFF
 PAGESIZE = 0x1000

-# LINIEN_OFFSET = 0x0
-LINIEN_OFFSET = 0x300000
+LINIEN_OFFSET = 0x0
+# LINIEN_OFFSET = 0x300000

 # ----------------------------------------------------------------
 # FRONT PANEL LEDS REGISTER ADDRESSES
@ -75,46 +72,3 @@ CH0_HIGH_WORD_ADDR      =   DAC_BASE_ADDR + CH0_HIGH_WORD_OFFSET
 CH0_LOW_WORD_ADDR       =   DAC_BASE_ADDR + CH0_LOW_WORD_OFFSET
 CH1_HIGH_WORD_ADDR      =   DAC_BASE_ADDR + CH1_HIGH_WORD_OFFSET
 CH1_LOW_WORD_ADDR       =   DAC_BASE_ADDR + CH1_LOW_WORD_OFFSET
-
-
-def read_from_memory(address, n_bytes):
-    assert n_bytes <= 4
-    addr = address
-
-    try:
-        f = os.open("/dev/mem", os.O_SYNC | os.O_RDWR)
-        with mmap.mmap(
-            f,
-            PAGESIZE,
-            mmap.MAP_SHARED,
-            mmap.PROT_READ | mmap.PROT_WRITE,
-            offset=addr & ~MAP_MASK,
-        ) as mem:
-            start_addr = addr & MAP_MASK
-            stop_addr = start_addr + 4
-            contents = mem[start_addr:stop_addr]
-            read_value = list(contents)[:n_bytes]
-    finally:
-        os.close(f)
-
-    return read_value
-
-def write_to_memory(address, value):
-    value_bytes = value.to_bytes(4, "little")
-    addr = address
-
-    try:
-        f = os.open("/dev/mem", os.O_SYNC | os.O_RDWR)
-        with mmap.mmap(
-            f,
-            PAGESIZE,
-            mmap.MAP_SHARED,
-            mmap.PROT_READ | mmap.PROT_WRITE,
-            offset=addr & ~MAP_MASK,
-        ) as mem:
-            start_addr = addr & MAP_MASK
-            stop_addr = start_addr + 4
-            mem[start_addr:stop_addr] = value_bytes
-            contents = mem[start_addr:stop_addr]
-    finally:
-        os.close(f)
--- a/fast-servo/pyfastservo/dac.py
+++ b/fast-servo/pyfastservo/dac.py
@ -17,10 +17,11 @@
 # You should have received a copy of the GNU General Public License
 # along with this program. If not, see <https://www.gnu.org/licenses/>.

-import time
+import mmap
+import os

 import spidev
-from pyfastservo.common import (
+from common import (
    CH0_HIGH_WORD_ADDR,
    CH0_LOW_WORD_ADDR,
    CH1_HIGH_WORD_ADDR,
@ -28,69 +29,117 @@ from pyfastservo.common import (
    CTRL_ADDR,
    MAP_MASK,
    PAGESIZE,
-    write_to_memory,
-    read_from_memory
 )

 # /dev/spidev2.0  <=> spidev<BUS>.<DEVICE>
 MAIN_DAC_BUS = 2
 MAIN_DAC_DEVICE = 0
+
 DAC_VERSION = 0x0A


-def spi_write(spi, address, value):
-    spi.xfer2([address, value])
+def main_dac_init():
+    spi = spidev.SpiDev()

-def spi_read(spi, address):
-    rx_buffer = spi.xfer2([0x80 | address, 0x00])
-    return rx_buffer[1]
+    try:
+        spi.open(MAIN_DAC_BUS, MAIN_DAC_DEVICE)
+        spi.max_speed_hz = 5000
+        spi.mode = 0b00  # CPOL = 0 CPHA = 0
+        spi.cshigh = True

-def soft_reset(spi):
-    spi_write(spi, 0x00, 0x10)  # Software reset
-    spi_write(spi, 0x00, 0x00)  # Release software reset
-    spi_read(spi, 0x00)         # Read reset address (necessary for reset to take effect)
+        spi_buffer = [0x00, 0x10]  # software reset
+        spi.xfer2(spi_buffer)

-def check_version(spi):
-    version = spi_read(spi, 0x1F)
-    print(f"DAC version: 0x{version:02X}")
-    return version == DAC_VERSION
+        spi_buffer = [0x00, 0x00]  # release software reset
+        spi.xfer2(spi_buffer)

-def configure_dac(spi):
-    power_down_reg = spi_read(spi, 0x01)
-    spi_write(spi, 0x01, power_down_reg & ~(1 << 0))  # Clear EXTREF bit for internal reference
-    spi_write(spi, 0x0D, 0x00)      # Set RREF to 10 kΩ for 1.0V reference
-    spi_write(spi, 0x04, 0xA0)      # Enable on-chip IRSET (1.6 kΩ for 20mA output)
-    spi_write(spi, 0x07, 0xA0)      # Enable on-chip QRSET (1.6 kΩ for 20mA output)
-    spi_write(spi, 0x05, 0x00)      # Disable internal IRCML
-    spi_write(spi, 0x08, 0x00)      # Disable internal QRCML
-    spi_write(spi, 0x02, 0xB4)      # Enable 2's complement, IFirst: True, IRising: True, DCI_EN: Enabled
-    spi_write(spi, 0x14, 0x00)      
-    spi_write(spi, 0x14, 0x08)      # Trigger the retimer to reacquire the clock relationship
-    spi_write(spi, 0x14, 0x00)
+        spi_buffer = [
+            0x80,
+            0x00,
+        ]  # for some reason it is needed to read the reset address for reset to actually reset
+        rx_buffer = spi.xfer2(spi_buffer)

-def dac_self_calibration(spi):
-    spi_write(spi, 0x12, 0x00)      # Reset calibration status
-    spi_write(spi, 0x0E, 0x08)      # Enable calibration clock, default divide ratio
-    spi_write(spi, 0x0E, 0x38)      # CALSELI = 1, CALSELQ = 1, CALCLK = 1
-    spi_write(spi, 0x12, 0x10)      # Set CALEN bit
+        spi_buffer = [0x9F, 0x00]  # hardware version
+        rx_buffer = spi.xfer2(spi_buffer)
+        if rx_buffer[1] != DAC_VERSION:
+            print(f"Unrecognized device: 0x{rx_buffer[1]:02X}")

-    while True:
-        status = spi_read(spi, 0x0F)
-        if status & 0xC0 == 0xC0:   # Both CALSTATI and CALSTATQ are 1
-            break
-        time.sleep(0.01)
+        print("=== Contents of spi buffer after DAC VERSION read back: ===")
+        print(f"0x{rx_buffer[0]:02X}{rx_buffer[1]:02X}")
+
+        spi_buffer = [0x82, 00]
+        rx_buffer = spi.xfer2(spi_buffer)
+        print(f"0x{rx_buffer[0]:02X}{rx_buffer[1]:02X}")
+
+        # set to 2's complement and I to be first of pair on data input pads
+        spi_buffer = [0x02, 0xB4]
+        rx_buffer = spi.xfer2(spi_buffer)
+        spi_buffer = [0x82, 00]
+        rx_buffer = spi.xfer2(spi_buffer)
+        print(f"0x{rx_buffer[0]:02X}{rx_buffer[1]:02X}")
+
+        for i in range(10):
+            spi_buffer = [0x94, 0x00]
+            rx_buffer = spi.xfer2(spi_buffer)
+            print(f"0x{rx_buffer[0]:02X}{rx_buffer[1]:02X}")
+
+    finally:
+        spi.close()
+
+
+def read_from_memory(address, n_bytes):
+    assert n_bytes <= 4
+    addr = address
+
+    try:
+        f = os.open("/dev/mem", os.O_SYNC | os.O_RDWR)
+        with mmap.mmap(
+            f,
+            PAGESIZE,
+            mmap.MAP_SHARED,
+            mmap.PROT_READ | mmap.PROT_WRITE,
+            offset=addr & ~MAP_MASK,
+        ) as mem:
+            start_addr = addr & MAP_MASK
+            stop_addr = start_addr + 4
+            # print(f"addr: 0x{addr:x}\tstart_addr: 0x{start_addr}\tstop_addr: 0x{stop_addr}")
+            contents = mem[start_addr:stop_addr]
+            read_value = list(contents)[:n_bytes]
+    finally:
+        os.close(f)
+
+    return read_value
+
+
+def write_to_memory(address, value):
+    value_bytes = value.to_bytes(4, "little")
+    addr = address
+
+    try:
+        f = os.open("/dev/mem", os.O_SYNC | os.O_RDWR)
+        with mmap.mmap(
+            f,
+            PAGESIZE,
+            mmap.MAP_SHARED,
+            mmap.PROT_READ | mmap.PROT_WRITE,
+            offset=addr & ~MAP_MASK,
+        ) as mem:
+            start_addr = addr & MAP_MASK
+            stop_addr = start_addr + 4
+            mem[start_addr:stop_addr] = value_bytes
+            contents = mem[start_addr:stop_addr]
+    finally:
+        os.close(f)

-    spi_write(spi, 0x12, 0x00)      # Clear calibration bits
-    spi_write(spi, 0x0E, 0x30)      # Keep CALSELI and CALSELQ set, clear CALCLK
-    print("DAC self-calibration completed")

 def manual_override(enable=True):
    reg_contents = read_from_memory(CTRL_ADDR, 1)[0]
+    print(f"REG contents: 0b{reg_contents:03b}")
    to_write = reg_contents | 0b1 if enable else reg_contents & 0b110
    write_to_memory(CTRL_ADDR, to_write)
-    print(f"Set DAC Output Manual Override: {enable}")

-def power_down_afe(channel, power_down=True):
+
+def power_down(channel, power_down=True):
    assert channel in (0, 1)

    bitmask = 1 << (channel + 1) & 0b111
@ -101,68 +150,33 @@ def power_down_afe(channel, power_down=True):
    to_write = reg_contents | value
    write_to_memory(CTRL_ADDR, to_write)
    reg_contents = read_from_memory(CTRL_ADDR, 1)[0]
-    print(f"Power Down DAC AFE Ch{channel}: {power_down}")
+    print(f"REG contents: 0b{reg_contents:03b}")

-def set_dac_output(value):
-    value = min(value, 0x3FFF)
-    low_word = value & 0xFF
-    high_word = (value >> 8) & 0x3F

-    # Note: DAC HIGH word and LOW word output are not updated 
-    #   at the same time. On scope, you will see more than one step
-    #   of value changed.
-    write_to_memory(CH0_HIGH_WORD_ADDR, high_word)
-    write_to_memory(CH0_LOW_WORD_ADDR, low_word)
-    write_to_memory(CH1_HIGH_WORD_ADDR, high_word)
-    write_to_memory(CH1_LOW_WORD_ADDR, low_word)
-    print(f"DAC output set to: 0x{value:04X}")
-
-def check_clk_relationship(spi):
-    clkmode_reg = spi_read(spi, 0x14)
-    print(f"CLKMODE reg: 0x{clkmode_reg:02X}")
-    if clkmode_reg & 0b00010000:
-        print("Clock relationship is not found")
-        return False
+def write_sample(channel, sample):
+    assert channel in (0, 1)
+    if channel == 0:
+        addresses = [CH0_HIGH_WORD_ADDR, CH0_LOW_WORD_ADDR]
    else:
-        print("Clock relationship is found")
-        return True
+        addresses = [CH1_HIGH_WORD_ADDR, CH1_LOW_WORD_ADDR]

-def configure_ad9117():
-    spi = spidev.SpiDev()
-    spi.open(MAIN_DAC_BUS, MAIN_DAC_DEVICE)
-    spi.max_speed_hz = 5000
-    spi.mode = 0b00  # CPOL = 0 CPHA = 0
-    spi.cshigh = False
+    low_word_value = sample & 0xFF
+    high_word_value = (sample >> 8) & 0x3F
+    values = [high_word_value, low_word_value]
+    for addr, value in zip(addresses, values):
+        write_to_memory(addr, value)

-    try:
-        soft_reset(spi)
-        if not check_version(spi):
-            print("Unrecognized DAC version")
-            return False

-        power_down_afe(0, True)
-        power_down_afe(1, True)
+def write_ramp():
+    signal = [i for i in range(16384)]

-        configure_dac(spi)
-        check_clk_relationship(spi)
-        dac_self_calibration(spi)
+    for value in signal:
+        write_sample(0, value)

-        # Enable DAC outputs
-        spi_write(spi, 0x01, spi_read(spi, 0x01) & ~((1 << 4) | (1 << 3)))
-
-        power_down_afe(0, False)
-        power_down_afe(1, False)
-        manual_override(False)
-
-        print("AD9117 configuration completed successfully")
-        return True
-
-    except Exception as e:
-        print(f"Error configuring AD9117: {e}")
-        return False
-
-    finally:
-        spi.close()
+def main():
+    main_dac_init()
+    power_down(0, False)
+    power_down(1, False)
    
 if __name__ == "__main__":
-    configure_ad9117()
+    main()
--- a/fast-servo/pyfastservo/fp_leds.py
+++ b/fast-servo/pyfastservo/fp_leds.py
@ -21,7 +21,7 @@ import mmap
 import os
 import time

-from pyfastservo.common import (
+from common import (
    LED0_BASE_ADDR,
    LED1_BASE_ADDR,
    LED2_BASE_ADDR,
--- a/fast-servo/pyfastservo/initialize.py
+++ b/fast-servo/pyfastservo/initialize.py
@ -17,12 +17,14 @@
 # You should have received a copy of the GNU General Public License
 # along with this program. If not, see <https://www.gnu.org/licenses/>.

-from pyfastservo import adc, si5340, dac
+import adc
+import si5340
+import dac

 def main():
    si5340.configure_si5340()
-    adc.configure_ltc2195()
-    dac.configure_ad9117()
+    adc.main()
+    dac.main()

 if __name__ == "__main__":
    main()
--- a/fast-servo/pyfastservo/si5340.py
+++ b/fast-servo/pyfastservo/si5340.py
@ -17,264 +17,102 @@
 # You should have received a copy of the GNU General Public License
 # along with this program. If not, see <https://www.gnu.org/licenses/>.

-# Additional Reference:
-# https://github.com/torvalds/linux/blob/master/drivers/clk/clk-si5341.c
-
-import time
 from smbus2 import SMBus

 BUS_NO = 0
 IC_ADDR = 0x74

-DEVICE_READY = 0x00FE
-PLL_M_DEN = 0x023B
-STATUS = 0x000C
-STATUS_STICKY = 0x0011
+PAGE_ADDR = 0x1

-STATUS_LOSREF = 0x04
-STATUS_LOL = 0x08
+OUT0_MUX_SEL_ADDR = 0x15
+OUT1_MUX_SEL_ADDR = 0x1A
+OUT2_MUX_SEL_ADDR = 0x29
+OUT3_MUX_SEL_ADDR = 0x2E
+
+OUT2_AMPL_ADDR = 0x28
+
+OUT3_PDN_ADDR = 0x2B
+OUT3_FORMAT_ADDR = 0x2C
+OUT3_AMPL_ADDR = 0x2D


-def write_register(bus, address, value):
-    page = address >> 8
-    register = address & 0xFF
-    bus.write_byte_data(IC_ADDR, 0x01, page)
-    try:
-        bus.write_byte_data(IC_ADDR, register, value)
-    except Exception as e:
-        raise Exception(f"Write failed 0x{value:02X} at 0x{address:04X}: {e}")
+N1_DIVIDER_UPDATE_ADDR = 0x17

-def write_preamble(bus):
-    preamble = [
-        (0x0B24, 0xC0),
-        (0x0B25, 0x00),
-        (0x0502, 0x01),
-        (0x0505, 0x03),
-        (0x0957, 0x17),
-        (0x0B4E, 0x1A),
+data_to_write = 0
+clk_out_addr = [
+    OUT0_MUX_SEL_ADDR,
+    OUT1_MUX_SEL_ADDR,
+    OUT2_MUX_SEL_ADDR,
+    OUT3_MUX_SEL_ADDR,
 ]
-    for address, value in preamble:
-        write_register(bus, address, value)
-
-def write_postamble(bus):
-    postamble = [
-        (0x001C, 0x01),  # Soft reset
-        (0x0B24, 0xC3),
-        (0x0B25, 0x02),
-    ]
-    for address, value in postamble:
-        write_register(bus, address, value)
-
-def wait_device_ready(bus):
-    for _ in range(15):
-        if bus.read_byte_data(IC_ADDR, DEVICE_READY) == 0x0F:
-            return True
-        time.sleep(0.02)
-    return False
-
-def wait_for_lock(bus):
-    for _ in range(10):
-        status = bus.read_byte_data(IC_ADDR, STATUS)
-        if not (status & (STATUS_LOSREF | STATUS_LOL)):
-            return True
-        time.sleep(0.01)
-    return False
-
-def check_pll_status(bus):
-    pll_status = bus.read_byte_data(IC_ADDR, 0x0C)
-    pll_locked = not (pll_status & STATUS_LOL)
-    print(f"PLL {'locked' if pll_locked else 'unlocked'}")
-    return pll_locked
-
-def check_los_status(bus):
-    los_status = bus.read_byte_data(IC_ADDR, 0x0D)
-    xaxb_los = (los_status & 0x10) != 0
-    print(f"XA/XB LOS {'asserted' if xaxb_los else 'deasserted'}")
-    return not xaxb_los

 def configure_si5340():
    with SMBus(BUS_NO) as bus:
-        if not wait_device_ready(bus):
-            print("Device not ready. Aborting.")
-            return

-        # Programming sequence from ClockBuilder Pro, default settings
-        # to initialize system using XTAL input
-        main_config = [
-            (0x0006, 0x00),  # TOOL_VERSION
-            (0x0007, 0x00),  # Not in datasheet
-            (0x0008, 0x00),  # Not in datasheet
-            (0x000B, 0x74),  # I2C_ADDR
-            (0x0017, 0xD0),  # INT mask (disable interrupts)
-            (0x0018, 0xFF),  # INT mask
-            (0x0021, 0x0F),  # Select XTAL as input
-            (0x0022, 0x00),  # Not in datasheet
-            (0x002B, 0x02),  # SPI config
-            (0x002C, 0x20),  # LOS enable for XTAL
-            (0x002D, 0x00),  # LOS timing
-            (0x002E, 0x00),  # LOS trigger (thresholds)
-            (0x002F, 0x00),
-            (0x0030, 0x00),
-            (0x0031, 0x00),
-            (0x0032, 0x00),
-            (0x0033, 0x00),
-            (0x0034, 0x00),
-            (0x0035, 0x00),  # LOS trigger (thresholds) end
-            (0x0036, 0x00),  # LOS clear (thresholds)
-            (0x0037, 0x00),
-            (0x0038, 0x00),
-            (0x0039, 0x00),
-            (0x003A, 0x00),
-            (0x003B, 0x00),
-            (0x003C, 0x00),
-            (0x003D, 0x00),  # LOS clear (thresholds) end
-            (0x0041, 0x00),  # LOS0_DIV_SEL
-            (0x0042, 0x00),  # LOS1_DIV_SEL
-            (0x0043, 0x00),  # LOS2_DIV_SEL
-            (0x0044, 0x00),  # LOS3_DIV_SEL
-            (0x009E, 0x00),  # LOL_SET_THR
-            (0x0102, 0x01),  # Enable outputs
-            (0x013F, 0x00),  # OUTX_ALWAYS_ON
-            (0x0140, 0x00),  # OUTX_ALWAYS_ON
-            (0x0141, 0x40),  # OUT_DIS_LOL_MSK, OUT_DIS_MSK_LOS_PFD
-            (0x0202, 0x00),  # XAXB_FREQ_OFFSET (=0)
+        bus.write_byte_data(IC_ADDR, PAGE_ADDR, 0x0)  # setting page to page 0

-            # PLL Configuration
-            (0x0235, 0x00),  # M_NUM
-            (0x0236, 0x00),
-            (0x0237, 0x00),
-            (0x0238, 0x80),
-            (0x0239, 0x89),
-            (0x023A, 0x00),
-            (0x023B, 0x00),  # M_DEN
-            (0x023C, 0x00),
-            (0x023D, 0x00),
-            (0x023E, 0x80),
+        # read device id
+        low_word = bus.read_byte_data(IC_ADDR, 0x2)
+        high_word = bus.read_byte_data(IC_ADDR, 0x3)

-            # Synthesizer configuration
-            (0x0302, 0x00),  # N0_NUM
-            (0x0303, 0x00),
-            (0x0304, 0x00),
-            (0x0305, 0x00),
-            (0x0306, 0x21),
-            (0x0307, 0x00),
-            (0x0308, 0x00),  # N0_DEN
-            (0x0309, 0x00),
-            (0x030A, 0x00),
-            (0x030B, 0x80),
-            (0x030C, 0x01), # N0_UPDATE
+        print(f"DEV ID: 0x{high_word:2x}{low_word:2x}")

-            # N1 Configuration (1:1 ratio)
-            (0x030D, 0x00),  # N1_NUM
-            (0x030E, 0x00),
-            (0x030F, 0x00),
-            (0x0310, 0x00),
-            (0x0311, 0x00),
-            (0x0312, 0x01),
-            (0x0313, 0x00),  # N1_DEN
-            (0x0314, 0x00),
-            (0x0315, 0x00),
-            (0x0316, 0x01),
-            (0x0317, 0x01),  # N1_UPDATE
+        data_to_write = 0x1
+        bus.write_byte_data(
+            IC_ADDR, PAGE_ADDR, data_to_write
+        )  # change to page 1 for output settings

-            # N2 Configuration (1:1 ratio)
-            (0x0318, 0x00),  # N2_NUM
-            (0x0319, 0x00),
-            (0x031A, 0x00),
-            (0x031B, 0x00),
-            (0x031C, 0x00),
-            (0x031D, 0x01),
-            (0x031E, 0x00),  # N2_DEN
-            (0x031F, 0x00),
-            (0x0320, 0x00),
-            (0x0321, 0x01),
-            (0x0322, 0x01),  # N2_UPDATE
+        readback = bus.read_byte_data(IC_ADDR, PAGE_ADDR)
+        if data_to_write != readback:
+            raise ValueError(f"Failed to set page.")

-            # N3 Configuration (1:1 ratio)
-            (0x0323, 0x00),  # N3_NUM
-            (0x0324, 0x00),
-            (0x0325, 0x00),
-            (0x0326, 0x00),
-            (0x0327, 0x00),
-            (0x0328, 0x01),
-            (0x0329, 0x00),  # N3_DEN
-            (0x032A, 0x00),
-            (0x032B, 0x00),
-            (0x032C, 0x01),
-            (0x032D, 0x01),  # N3_UPDATE
+        for addr in clk_out_addr:
+            bus.write_byte_data(IC_ADDR, addr, 1)  # set source to N1

-            # Output configuration
-            (0x0112, 0x06),  # OUT0 config
-            (0x0113, 0x09),  # OUT0 format
-            (0x0114, 0x3B),  # OUT0 CM/AMPL
-            (0x0115, 0x28),  # OUT0 MUX_SEL
+        bus.write_byte_data(IC_ADDR, OUT2_AMPL_ADDR, 13)
+        readback = bus.read_byte_data(IC_ADDR, OUT2_AMPL_ADDR)
+        # if data_to_write != readback:
+        #     raise ValueError(f"Problematic read: {readback}.")

-            (0x0117, 0x06),  # OUT1 config
-            (0x0118, 0x09),  # OUT1 format
-            (0x0119, 0x3B),  # OUT1 CM/AMPL
-            (0x011A, 0x28),  # OUT1 MUX_SEL
+        bus.write_byte_data(IC_ADDR, OUT2_AMPL_ADDR, 0x6B)  # setting OUT2 to LVDS25

-            (0x0126, 0x06),  # OUT2 config
-            (0x0127, 0x09),  # OUT2 format
-            (0x0128, 0x3B),  # OUT2 CM/AMPL
-            (0x0129, 0x28),  # OUT2 MUX_SEL
+        bus.write_byte_data(IC_ADDR, OUT3_FORMAT_ADDR, 0xCC)  # SETTING out3 to LVCMOS 18
+        # bus.write_byte_data(IC_ADDR, 0x2E, 0x09)		# SETTING out3 to LVCMOS 33

-            (0x012B, 0x06),  # OUT3 config
-            (0x012C, 0xCC),  # OUT3 format
-            (0x012D, 0x00),  # OUT3 CM/AMPL
-            (0x012E, 0x58),  # OUT3 MUX_SEL
+        readback = bus.read_byte_data(IC_ADDR, OUT3_PDN_ADDR)
+        print(f"Si5340 OUTx_PDN CLK3: 0x{readback}")

-            # Miscellaneous configuration
-            (0x090E, 0x02),  # XAXB_EXTCLK_EN=0 XAXB_PDNB=1 (use XTAL)
-            (0x091C, 0x04),  # ZDM_EN=4 (Normal mode)
-            (0x0943, 0x00),  # IO_VDD_SEL
-            (0x0949, 0x00),  # IN_EN (disable input clocks)
-            (0x094A, 0x00),  # INx_TO_PFD_EN (disabled)
-            (0x094E, 0x49),  # REFCLK_HYS_SEL (set by CBPro)
-            (0x094F, 0x02),  # Not in datasheet
-            (0x095E, 0x00),  # M_INTEGER (set by CBPro)
-            (0x0A02, 0x00),  # N_ADD_0P5 (set by CBPro)
-            (0x0A03, 0x01),  # N_CLK_TO_OUTX_EN
-            (0x0A04, 0x01),  # N_PIBYP
-            (0x0A05, 0x01),  # N_PDNB
-            (0x0A14, 0x00),  # N0_HIGH_FREQ (set by CBPro)
-            (0x0A1A, 0x00),  # N1_HIGH_FREQ (set by CBPro)
-            (0x0A20, 0x00),  # N2_HIGH_FREQ (set by CBPro)
-            (0x0A26, 0x00),  # N3_HIGH_FREQ (set by CBPro)
-            (0x0B44, 0x0F),  # PDIV_ENB (set by CBPro)
-            (0x0B4A, 0x0E),  # N_CLK_DIS
-            (0x0B57, 0x0E),  # VCO_RESET_CALCODE (set by CBPro)
-            (0x0B58, 0x01),  # VCO_RESET_CALCODE (set by CBPro)
-        ]
+        readback = bus.read_byte_data(IC_ADDR, OUT3_FORMAT_ADDR)
+        print(f"Si5340 OUTx_FORMAT CLK3: 0x{readback}")

-        write_preamble(bus)
+        readback = bus.read_byte_data(IC_ADDR, OUT3_AMPL_ADDR)
+        print(f"Si5340 OUTx_AMPL CLK3: 0x{readback}")

-        time.sleep(0.3)
+        readback = bus.read_byte_data(IC_ADDR, OUT3_MUX_SEL_ADDR)
+        print(f"Si5340 OUTx_CM CLK3: 0x{readback}")

-        print("Writing main configuration...")
-        for address, value in main_config:
-            write_register(bus, address, value)
-        print("Main configuration written")
+        bus.write_byte_data(
+            IC_ADDR, PAGE_ADDR, 0x3
+        )  # setting page to 3 to change dividers values

-        write_postamble(bus)
+        n1_numerator = [0x0, 0x0, 0x0, 0x60, 0x22, 0x0]
+        n1_numerator_10M = [0x0, 0x0, 0x0, 0xC0, 0x57, 0x1]
+        n1_num_addr = [0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12]
+        n1_denom_addr = [0x13, 0x14, 0x15, 0x16]
+        for addr, value in zip(n1_num_addr, n1_numerator):
+            bus.write_byte_data(IC_ADDR, addr, value)

-        if not wait_for_lock(bus):
-            print("Error waiting for input clock or PLL lock")
-        else:
-            print("Input clock present and PLL locked")
+        bus.write_byte_data(IC_ADDR, N1_DIVIDER_UPDATE_ADDR, 1)

-        bus.write_byte_data(IC_ADDR, STATUS_STICKY, 0)
+        for addr in n1_num_addr:
+            readback = bus.read_byte_data(IC_ADDR, addr)
+            print(f"Numerator buffer: 0x{readback:02x}")

-        # Final status check
-        pll_locked = check_pll_status(bus)
-        xaxb_signal_present = check_los_status(bus)
+        for addr in n1_denom_addr:
+            readback = bus.read_byte_data(IC_ADDR, addr)
+            print(f"Denominator buffer: 0x{readback:02x}")

-        if not pll_locked:
-            print("Error: PLL is not locked")
-        elif not xaxb_signal_present:
-            print("Error: XA/XB signal is lost")
-        else:
-            print("Si5340 configuration completed successfully")
+        bus.write_byte_data(IC_ADDR, PAGE_ADDR, 0x0)  # setting page to page 0

 if __name__ == "__main__":
    configure_si5340()
--- a/flake.lock
+++ b/flake.lock
@ -18,16 +18,16 @@
    },
    "nixpkgs": {
      "locked": {
-        "lastModified": 1723938990,
-        "narHash": "sha256-9tUadhnZQbWIiYVXH8ncfGXGvkNq3Hag4RCBEMUk7MI=",
+        "lastModified": 1709237383,
+        "narHash": "sha256-cy6ArO4k5qTx+l5o+0mL9f5fa86tYUX3ozE1S+Txlds=",
        "owner": "NixOS",
        "repo": "nixpkgs",
-        "rev": "c42fcfbdfeae23e68fc520f9182dde9f38ad1890",
+        "rev": "1536926ef5621b09bba54035ae2bb6d806d72ac8",
        "type": "github"
      },
      "original": {
        "owner": "NixOS",
-        "ref": "nixos-24.05",
+        "ref": "nixos-unstable",
        "repo": "nixpkgs",
        "type": "github"
      }
@ -64,11 +64,11 @@
    "src-migen": {
      "flake": false,
      "locked": {
-        "lastModified": 1721561053,
-        "narHash": "sha256-z3LRhNmKZrjr6rFD0yxtccSa/SWvFIYmb+G/D5d2Jd8=",
+        "lastModified": 1702942348,
+        "narHash": "sha256-gKIfHZxsv+jcgDFRW9mPqmwqbZXuRvXefkZcSFjOGHw=",
        "owner": "m-labs",
        "repo": "migen",
-        "rev": "9279e8623f8433bc4f23ac51e5e2331bfe544417",
+        "rev": "50934ad10a87ade47219b796535978b9bdf24023",
        "type": "github"
      },
      "original": {
@ -80,11 +80,11 @@
    "src-misoc": {
      "flake": false,
      "locked": {
-        "lastModified": 1715647536,
-        "narHash": "sha256-q+USDcaKHABwW56Jzq8u94iGPWlyLXMyVt0j/Gyg+IE=",
+        "lastModified": 1699352904,
+        "narHash": "sha256-SglyTmXOPv8jJOjwAjJrj/WhAkItQfUbvKfUqrynwRg=",
        "ref": "refs/heads/master",
-        "rev": "fea9de558c730bc394a5936094ae95bb9d6fa726",
-        "revCount": 2455,
+        "rev": "a53859f2167c31ab5225b6c09f30cf05527b94f4",
+        "revCount": 2452,
        "submodules": true,
        "type": "git",
        "url": "https://github.com/m-labs/misoc.git"
--- a/flake.nix
+++ b/flake.nix
@ -1,7 +1,7 @@
 {
  description = "Firmware for Sinara Fast-Servo based on Not-OS and Linien";
  
-  inputs.nixpkgs.url = github:NixOS/nixpkgs/nixos-24.05;
+  inputs.nixpkgs.url = github:NixOS/nixpkgs/nixos-unstable;
  inputs.not-os.url = github:cleverca22/not-os;
  inputs.not-os.inputs.nixpkgs.follows = "nixpkgs";

@ -11,7 +11,7 @@
  outputs = { self, nixpkgs, not-os, src-migen, src-misoc }:
    let
      pkgs = import nixpkgs { system = "x86_64-linux"; overlays = [ crosspkgs-overlay ]; };
-      pkgs-armv7l = pkgs.pkgsCross.zynq-armv7l-linux;
+      not-os-cfg = not-os-configured.config.system;
      fsbl-support = ./fast-servo/fsbl-support;

      patched-not-os = pkgs.applyPatches {
@ -100,49 +100,38 @@
        runScript = "vivado";
      };

-      pyrp3 = pkgs-armv7l.python3Packages.buildPythonPackage rec {
+      pyrp3 = pkgs.python3Packages.buildPythonPackage rec {
        pname = "pyrp3";
        version = "1.2.0";
        pyproject = true;
        src = pkgs.fetchFromGitHub {
          owner = "linien-org";
-          repo = "pyrp3";
+          repo = "${pname}";
          rev = "v${version}";
          hash = "sha256-43TTlpJ5SMAjQM71bNVvrWQyciRXM3zpuA/Dw41AEgU=";
        };
-        patches = ./fast-servo/linien-pyrp3-monitor.patch;
-        nativeBuildInputs = with pkgs-armv7l.python3Packages; [
-          setuptools wheel setuptools-scm
-        ] ++ (with pkgs-armv7l; [ gcc gnumake ]);
-        propagatedBuildInputs = with pkgs-armv7l.python3Packages; [
+        nativeBuildInputs = with pkgs.python3Packages; [ setuptools wheel setuptools-scm ];
+        propagatedBuildInputs = with pkgs.python3Packages; [
          myhdl
          rpyc4
          cached-property
          numpy
        ];
-        postInstall = ''
-          cp monitor/libmonitor.so $out/lib
-        '';
-        postFixup = ''
-          substituteInPlace $out/${pkgs.python3.sitePackages}/pyrp3/raw_memory.py \
-            --replace "libmonitor.so" "$out/lib/libmonitor.so"
-        '';
      };

-      linien-server = pkgs-armv7l.python3Packages.buildPythonPackage rec {
+      linien-server = pkgs.python3Packages.buildPythonPackage rec {
        pname = "linien-server";
        pyproject = true;
        inherit (pkgs.python3Packages.linien-common) src version;
        sourceRoot = "source/linien-server";
        postPatch = ''
-          cp ${fast-servo-gateware}/csrmap.py linien_server/csrmap.py
          substituteInPlace linien_server/acquisition.py \
            --replace "  start_nginx()" "" \
            --replace "  stop_nginx()" "" \
            --replace "  flash_fpga()" ""
        '';
-        nativeBuildInputs = [ pkgs-armv7l.python3Packages.setuptools ];
-        propagatedBuildInputs = with pkgs-armv7l.python3Packages; [
+        nativeBuildInputs = [ pkgs.python3Packages.setuptools ];
+        propagatedBuildInputs = with pkgs.python3Packages; [
          appdirs
          certifi
          click
@ -154,6 +143,15 @@
        ];
      };

+      not-os-configured = (import patched-not-os {
+        inherit nixpkgs;
+        extraModules = [
+          "${patched-not-os}/zynq_image.nix"
+        ];
+        system = "x86_64-linux";
+        inherit crossSystem;
+      });
+
      fast-servo-gateware = pkgs.stdenv.mkDerivation rec {
        name = "fast-servo-gateware";
        inherit (pkgs.python3Packages.linien-common) src;
@ -186,33 +184,11 @@
          mkdir -p $out $out/nix-support
          cp gateware/build/top.bit $out
          cp linien-server/linien_server/gateware.bin $out
-          cp linien-server/linien_server/csrmap.py $out
          echo file binary-dist $out/top.bit >> $out/nix-support/hydra-build-products
          echo file binary-dist $out/gateware.bin >> $out/nix-support/hydra-build-products
        '';
      };

-      pyfastservo = pkgs-armv7l.python3Packages.buildPythonPackage rec {
-        name = "pyfastservo";
-        src = ./fast-servo;
-        preBuild = ''
-          cat > setup.py << EOF
-          from setuptools import setup
-
-          setup(
-            name="pyfastservo",
-            packages=["pyfastservo"],
-            install_requires=["spidev", "smbus2"],
-            entry_points = {"console_scripts": ["fp_leds=pyfastservo.fp_leds:main"]},
-          )
-          EOF
-        '';
-        propagatedBuildInputs = with pkgs-armv7l.python3Packages; [
-          spidev
-          smbus2
-        ];
-      };
-
      mkbootimage = pkgs.stdenv.mkDerivation {
        pname = "mkbootimage";
        version = "2.3dev";
@ -237,37 +213,6 @@
      };

      board-package-set = { board }: let
-        not-os-configured = (import patched-not-os {
-          inherit nixpkgs;
-          extraModules = [
-            "${patched-not-os}/zynq_image.nix"
-          ] ++ pkgs.lib.optionals (board == "fast-servo") [
-            ({ config, pkgs, lib, ... }: {
-              environment.systemPackages = [
-                linien-server
-                (pkgs.python3.withPackages(ps: [ pyfastservo ]))
-              ];
-              boot.postBootCommands = lib.mkAfter ''
-
-                # Program the FPGA
-                set +x
-                echo "Loading bitstream into SRAM..."
-                echo 0 > /sys/class/fpga_manager/fpga0/flags
-                mkdir -p /lib/firmware
-                cp ${fast-servo-gateware}/gateware.bin /lib/firmware/
-                echo gateware.bin > /sys/class/fpga_manager/fpga0/firmware
-
-                # Run device init scripts
-                echo "Initializing clock generator, ADC, and DAC..."
-                python3 -m pyfastservo.initialize
-              '';
-            })];
-          system = "x86_64-linux";
-          inherit crossSystem;
-        });
-
-        not-os-build = not-os-configured.config.system.build;
-
        fsbl = pkgs.stdenv.mkDerivation {
          name = "${board}-fsbl";
          src = pkgs.fetchFromGitHub {
@ -306,8 +251,7 @@
          dontFixup = true;
        };

-        u-boot = (pkgs-armv7l.buildUBoot {
-            name = "${board}-u-boot";
+        u-boot = (pkgs.pkgsCross.zynq-armv7l-linux.buildUBoot {
            defconfig = "xilinx_zynq_virt_defconfig";
            patches = [] ++ pkgs.lib.optional (board == "fast-servo") ./fast-servo/u-boot.patch;
            preConfigure = ''
@ -317,7 +261,7 @@
              CONFIG_SYS_PROMPT="${board}-boot> "
              CONFIG_AUTOBOOT=y
              CONFIG_BOOTCOMMAND="${builtins.replaceStrings [ "\n" ] [ "; " ] ''
-                setenv bootargs 'root=/dev/mmcblk0p2 console=ttyPS0,115200n8 systemConfig=${builtins.unsafeDiscardStringContext not-os-build.toplevel}'
+                setenv bootargs 'root=/dev/mmcblk0p2 console=ttyPS0,115200n8 systemConfig=${builtins.unsafeDiscardStringContext not-os-cfg.build.toplevel}'
                fatload mmc 0 0x6400000 uImage
                fatload mmc 0 0x8000000 ${board}.dtb
                fatload mmc 0 0xA400000 uRamdisk.image.gz
@ -361,7 +305,7 @@
            echo file binary-dist $out/boot.bin >> $out/nix-support/hydra-build-products
          '';

-        dtb = pkgs.runCommand "${board}-dtb"
+        dtb = pkgs.runCommand "dtb"
          {
            buildInputs = [ pkgs.gcc pkgs.dtc ];
          }
@ -381,14 +325,14 @@

        sd-image = let
          rootfsImage = pkgs.callPackage (pkgs.path + "/nixos/lib/make-ext4-fs.nix") {
-            storePaths = [ not-os-build.toplevel ];
+            storePaths = [ not-os-cfg.build.toplevel ];
            volumeLabel = "ROOT";
          };
          # Current firmware (kernel, bootimage, etc..) takes ~18MB
          firmwareSize = 30;
          firmwarePartitionOffset = 8;
          in pkgs.stdenv.mkDerivation {
-            name = "${board}-sd-image";
+            name = "sd-image";
            nativeBuildInputs = with pkgs; [ dosfstools mtools libfaketime util-linux parted ];
            buildCommand = ''
              mkdir -p $out/nix-support $out/sd-image
@ -422,8 +366,8 @@
              mkdir firmware
              cp ${bootimage}/boot.bin firmware/
              cp ${dtb}/${board}.dtb firmware/
-              cp ${not-os-build.kernel}/uImage firmware/
-              cp ${not-os-build.uRamdisk}/initrd firmware/uRamdisk.image.gz
+              cp ${not-os-cfg.build.kernel}/uImage firmware/
+              cp ${not-os-cfg.build.uRamdisk}/initrd firmware/uRamdisk.image.gz

              (cd firmware; mcopy -psvm -i ../firmware_part.img ./* ::)
              dd conv=notrunc if=firmware_part.img of=$img seek=$START count=$SECTORS
@ -436,9 +380,7 @@
            export PATH=${pkgs.qemu}/bin:$PATH
            IMGDIR=$(mktemp -d /tmp/not-os-qemu-XXXXXX)
            BASE=$(realpath $(dirname $0))
-
-            qemu-img convert -O qcow2 -f raw -o preallocation=metadata $BASE/sd-image.img $IMGDIR/sd-sparse.qcow2
-            qemu-img create -F qcow2 -f qcow2 -b $IMGDIR/sd-sparse.qcow2 $IMGDIR/sd-overlay.qcow2 2G
+            qemu-img create -F raw -f qcow2 -b $BASE/sd-image.img $IMGDIR/sd-overlay.qcow2 512M

            # Some command arguments are based from samples in Xilinx QEMU User Documentation
            # See: https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/821854273/Running+Bare+Metal+Applications+on+QEMU
@ -453,7 +395,7 @@

            rm -rf $IMGDIR
          '';
-          in pkgs.runCommand "${board}-qemu" {
+          in pkgs.runCommand "not-os-qemu" {
            inherit qemuScript;
            passAsFile = [ "qemuScript" ];
            preferLocalBuild = true;
--- a/not-os-patches/network.patch
+++ b/not-os-patches/network.patch
@ -1,5 +1,5 @@
 diff --git a/configuration.nix b/configuration.nix
-index 010c487..2d08009 100644
+index 010c487..e1e85ba 100644
 --- a/configuration.nix
 +++ b/configuration.nix
@@ -1,4 +1,4 @@
@ -8,7 +8,7 @@ index 010c487..2d08009 100644
 
 {
   imports = [ ./qemu.nix ];
-@@ -7,10 +7,16 @@
+@@ -7,10 +7,15 @@
   environment.etc = {
     "ssh/authorized_keys.d/root" = {
       text = ''
@ -18,7 +18,6 @@ index 010c487..2d08009 100644
 +        ecdsa-sha2-nistp384 AAAAE2VjZHNhLXNoYTItbmlzdHAzODQAAAAIbmlzdHAzODQAAABhBNdIiLvP2hmDUFyyE0oLOIXrjrMdWWpBV9/gPR5m4AiARx4JkufIDZzmptdYQ5FhJORJ4lluPqp7dAmahoSwg4lv9Di0iNQpHMJvNGZLHYKM1H1FWCCFIEDJ8bD4SVfrDg== root
 +        ecdsa-sha2-nistp384 AAAAE2VjZHNhLXNoYTItbmlzdHAzODQAAAAIbmlzdHAzODQAAABhBF/YybP+fQ0J+bNqM5Vgx5vDmVqVWsgUdF1moUxghv7d73GZAFaM6IFBdrXTAa33AwnWwDPMrTgP1V6SXBkb3ciJo/lD1urJGbydbSI5Ksq9d59wvOeANvyWYrQw6+eqTQ== sb
 +        ecdsa-sha2-nistp384 AAAAE2VjZHNhLXNoYTItbmlzdHAzODQAAAAIbmlzdHAzODQAAABhBFkmOCQ3BQh3qUjLtfdqyeBsx8rkk/QYlzB0TMrnfn6waLN6yKfPC3WVFv4zN5kNKb/OayvqDa+zfkKe85e/oIPQQKflF7GrCHdssz33DCnW90cz532E6iqG1pjeZjID2A== flo
-+        ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICAranL376soiSJ0kxdYNrwElcaZPW1heLFjs8Y7n0jT linuswck
       '';
       mode = "0444";
     };
--- a/not-os-patches/pr-28.patch
+++ b/not-os-patches/pr-28.patch
@ -1,5 +1,5 @@
 diff --git a/base.nix b/base.nix
-index 7eaee32..9aa338e 100644
+index 7eaee32..3a2a0a9 100644
 --- a/base.nix
 +++ b/base.nix
@@ -27,6 +27,11 @@ with lib;
@ -14,12 +14,9 @@ index 7eaee32..9aa338e 100644
     not-os.simpleStaticIp = mkOption {
       type = types.bool;
       default = false;
-@@ -84,17 +89,25 @@ with lib;
-     };
-     environment.etc = {
+@@ -86,15 +91,25 @@ with lib;
       "nix/nix.conf".source = pkgs.runCommand "nix.conf" {} ''
-        extraPaths=$(for i in $(cat ${pkgs.writeReferencesToFile pkgs.runtimeShell}); do if test -d $i; then echo $i; fi; done)
-+        extraPaths=$(for i in $(cat ${pkgs.writeClosure [ pkgs.bash ]}); do if test -d $i; then echo $i; fi; done)
+         extraPaths=$(for i in $(cat ${pkgs.writeReferencesToFile pkgs.runtimeShell}); do if test -d $i; then echo $i; fi; done)
         cat > $out << EOF
 -        build-use-sandbox = true
 +        auto-optimise-store = true
@ -31,6 +28,8 @@ index 7eaee32..9aa338e 100644
 +        extra-sandbox-paths = /bin/sh=${pkgs.runtimeShell} $(echo $extraPaths)
 +        max-jobs = auto
 +        sandbox = true
+        substituters = https://cache.armv7l.xyz
+        trusted-public-keys = cache.armv7l.xyz-1:kBY/eGnBAYiqYfg0fy0inWhshUo+pGFM3Pj7kIkmlBk=
 +        trusted-users = root
         EOF
       '';
@ -152,7 +151,7 @@ index c61f9d6..fbdf0fd 100644
   };
 }
 diff --git a/zynq_image.nix b/zynq_image.nix
-index 3fa23ab..069fe89 100644
+index 3fa23ab..9d1621e 100644
 --- a/zynq_image.nix
 +++ b/zynq_image.nix
@@ -1,66 +1,89 @@
@ -164,7 +163,7 @@ index 3fa23ab..069fe89 100644
 -  # dont use overlays for the qemu, it causes a lot of wasted time on recompiles
 -  x86pkgs = import pkgs.path { system = "x86_64-linux"; };
 -  customKernel = pkgs.linux.override {
-+  customKernel = (pkgs.linux_6_6.override {
+  customKernel = (pkgs.linux.override {
     extraConfig = ''
       OVERLAY_FS y
 +      MEDIA_SUPPORT n
@ -250,7 +249,7 @@ index 3fa23ab..069fe89 100644
 -  environment.etc."service/getty/run".source = pkgs.writeShellScript "getty" ''
 -    agetty ttyPS0 115200
 +  environment = {
-+    systemPackages = with pkgs; [ inetutils wget gnugrep nano vim ];
+    systemPackages = with pkgs; [ inetutils wget nano ];
 +    etc = {
 +      "service/getty/run".source = pkgs.writeShellScript "getty" ''
 +        hostname ${config.networking.hostName}
--- a/not-os-patches/pr-33.patch
+++ b/not-os-patches/pr-33.patch
@ -394,10 +394,10 @@ index 0000000..53c5349
 \ No newline at end of file
 diff --git a/xilinx-fpga-manager.patch b/xilinx-fpga-manager.patch
 new file mode 100644
-index 0000000..33daffe
+index 0000000..59aa585
 --- /dev/null
 +++ b/xilinx-fpga-manager.patch
-@@ -0,0 +1,676 @@
+@@ -0,0 +1,663 @@
 +# Enable user-space interface for PL programming via Linux FPGA manager
 +# diff cherry-picked from Xilinx/linux-xilinx/tree/xlnx_rebase_v6.6_LTS
 +# commit IDs: e61c0a9, 0a38712, dc67651, 89a24e3, 8d224b1, 2a9c05f, 4e94580
@ -425,7 +425,7 @@ index 0000000..33daffe
 + 	tristate "Altera SOCFPGA FPGA Manager"
 + 	depends on ARCH_INTEL_SOCFPGA || COMPILE_TEST
 +diff --git a/drivers/fpga/fpga-mgr.c b/drivers/fpga/fpga-mgr.c
-+index 0f4035b089a2..3aa9f5f041f6 100644
+index 06651389c592..6e8c45974f28 100644
 +--- a/drivers/fpga/fpga-mgr.c
 ++++ b/drivers/fpga/fpga-mgr.c
 +@@ -8,6 +8,9 @@
@ -673,7 +673,7 @@ index 0000000..33daffe
 + 	NULL,
 + };
 + ATTRIBUTE_GROUPS(fpga_mgr);
-+@@ -739,6 +871,106 @@ void fpga_mgr_put(struct fpga_manager *mgr)
+@@ -732,6 +864,106 @@ void fpga_mgr_put(struct fpga_manager *mgr)
 + }
 + EXPORT_SYMBOL_GPL(fpga_mgr_put);
 + 
@ -780,8 +780,8 @@ index 0000000..33daffe
 + /**
 +  * fpga_mgr_lock - Lock FPGA manager for exclusive use
 +  * @mgr:	fpga manager
-+@@ -788,6 +1020,9 @@ __fpga_mgr_register_full(struct device *parent, const struct fpga_manager_info *
-+ 			 struct module *owner)
+@@ -779,6 +1011,9 @@ struct fpga_manager *
+ fpga_mgr_register_full(struct device *parent, const struct fpga_manager_info *info)
 + {
 + 	const struct fpga_manager_ops *mops = info->mops;
 ++#ifdef CONFIG_FPGA_MGR_DEBUG_FS
@ -790,7 +790,7 @@ index 0000000..33daffe
 + 	struct fpga_manager *mgr;
 + 	int id, ret;
 + 
-+@@ -826,10 +1061,28 @@ __fpga_mgr_register_full(struct device *parent, const struct fpga_manager_info *
+@@ -815,10 +1050,28 @@ fpga_mgr_register_full(struct device *parent, const struct fpga_manager_info *in
 + 	mgr->dev.of_node = parent->of_node;
 + 	mgr->dev.id = id;
 + 
@ -819,7 +819,7 @@ index 0000000..33daffe
 + 	/*
 + 	 * Initialize framework state by requesting low level driver read state
 + 	 * from device.  FPGA may be in reset mode or may have been programmed
-+@@ -843,6 +1096,28 @@ __fpga_mgr_register_full(struct device *parent, const struct fpga_manager_info *
+@@ -832,6 +1085,28 @@ fpga_mgr_register_full(struct device *parent, const struct fpga_manager_info *in
 + 		return ERR_PTR(ret);
 + 	}
 + 
@ -848,7 +848,7 @@ index 0000000..33daffe
 + 	return mgr;
 + 
 + error_device:
-+@@ -894,6 +1169,10 @@ void fpga_mgr_unregister(struct fpga_manager *mgr)
+@@ -882,6 +1157,10 @@ void fpga_mgr_unregister(struct fpga_manager *mgr)
 + {
 + 	dev_info(&mgr->dev, "%s %s\n", __func__, mgr->name);
 + 
@ -881,10 +881,10 @@ index 0000000..33daffe
 + 				     &firmware_name)) {
 + 		info->firmware_name = devm_kstrdup(dev, firmware_name,
 +diff --git a/drivers/fpga/zynqmp-fpga.c b/drivers/fpga/zynqmp-fpga.c
-+index f3434e2c487b..d2434ed85eff 100644
+index f3434e2c487b..db923746cac5 100644
 +--- a/drivers/fpga/zynqmp-fpga.c
 ++++ b/drivers/fpga/zynqmp-fpga.c
-+@@ -43,25 +43,47 @@ static int zynqmp_fpga_ops_write(struct fpga_manager *mgr,
+@@ -43,25 +43,42 @@ static int zynqmp_fpga_ops_write(struct fpga_manager *mgr,
 + 	struct zynqmp_fpga_priv *priv;
 + 	dma_addr_t dma_addr;
 + 	u32 eemi_flags = 0;
@ -915,11 +915,6 @@ index 0000000..33daffe
 ++
 + 	wmb(); /* ensure all writes are done before initiate FW call */
 + 
-++	if (priv->flags & FPGA_MGR_DDR_MEM_AUTH_BITSTREAM)
-++		eemi_flags |= XILINX_ZYNQMP_PM_FPGA_AUTHENTICATION_DDR;
-++	else if (priv->flags & FPGA_MGR_SECURE_MEM_AUTH_BITSTREAM)
-++		eemi_flags |= XILINX_ZYNQMP_PM_FPGA_AUTHENTICATION_OCM;
-++
 + 	if (priv->flags & FPGA_MGR_PARTIAL_RECONFIG)
 + 		eemi_flags |= XILINX_ZYNQMP_PM_FPGA_PARTIAL;
 + 
@ -936,22 +931,20 @@ index 0000000..33daffe
 + 	return ret;
 + }
 +diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
-+index e8b12ec8b060..ffd2dfdb6abd 100644
+index 9dda7d9898ff..edaf77160746 100644
 +--- a/include/linux/firmware/xlnx-zynqmp.h
 ++++ b/include/linux/firmware/xlnx-zynqmp.h
-+@@ -83,6 +83,10 @@
+@@ -70,6 +70,8 @@
 +  */
 + #define XILINX_ZYNQMP_PM_FPGA_FULL	0x0U
 + #define XILINX_ZYNQMP_PM_FPGA_PARTIAL	BIT(0)
-++#define XILINX_ZYNQMP_PM_FPGA_AUTHENTICATION_DDR	BIT(1)
-++#define XILINX_ZYNQMP_PM_FPGA_AUTHENTICATION_OCM	BIT(2)
 ++#define XILINX_ZYNQMP_PM_FPGA_ENCRYPTION_USERKEY	BIT(3)
 ++#define XILINX_ZYNQMP_PM_FPGA_ENCRYPTION_DEVKEY		BIT(4)
 + 
 + /* FPGA Status Reg */
 + #define XILINX_ZYNQMP_PM_FPGA_CONFIG_STAT_OFFSET	7U
 +diff --git a/include/linux/fpga/fpga-mgr.h b/include/linux/fpga/fpga-mgr.h
-+index 0d4fe068f3d8..f884d268c974 100644
+index 54f63459efd6..c96a4405f909 100644
 +--- a/include/linux/fpga/fpga-mgr.h
 ++++ b/include/linux/fpga/fpga-mgr.h
 +@@ -9,8 +9,11 @@
@ -966,7 +959,7 @@ index 0000000..33daffe
 + struct fpga_manager;
 + struct sg_table;
 + 
-+@@ -66,17 +69,29 @@ enum fpga_mgr_states {
+@@ -66,17 +69,25 @@ enum fpga_mgr_states {
 +  *
 +  * %FPGA_MGR_EXTERNAL_CONFIG: FPGA has been configured prior to Linux booting
 +  *
@ -980,10 +973,6 @@ index 0000000..33daffe
 ++ *
 ++ * %FPGA_MGR_USERKEY_ENCRYPTED_BITSTREAM: indicates bitstream is encrypted with
 ++ *					  user key
-++ * %FPGA_MGR_DDR_MEM_AUTH_BITSTREAM: do bitstream authentication using DDR
-++ *				     memory if supported
-++ * %FPGA_MGR_SECURE_MEM_AUTH_BITSTREAM: do bitstream authentication using secure
-++ *					memory if supported
 +  */
 + #define FPGA_MGR_PARTIAL_RECONFIG	BIT(0)
 + #define FPGA_MGR_EXTERNAL_CONFIG	BIT(1)
@ -997,7 +986,7 @@ index 0000000..33daffe
 + 
 + /**
 +  * struct fpga_image_info - information specific to an FPGA image
-+@@ -86,6 +101,7 @@ enum fpga_mgr_states {
+@@ -86,6 +97,7 @@ enum fpga_mgr_states {
 +  * @config_complete_timeout_us: maximum time for FPGA to switch to operating
 +  *	   status in the write_complete op.
 +  * @firmware_name: name of FPGA image firmware file
@ -1005,7 +994,7 @@ index 0000000..33daffe
 +  * @sgt: scatter/gather table containing FPGA image
 +  * @buf: contiguous buffer containing FPGA image
 +  * @count: size of buf
-+@@ -102,6 +118,7 @@ struct fpga_image_info {
+@@ -102,6 +114,7 @@ struct fpga_image_info {
 + 	u32 disable_timeout_us;
 + 	u32 config_complete_timeout_us;
 + 	char *firmware_name;
@ -1013,7 +1002,7 @@ index 0000000..33daffe
 + 	struct sg_table *sgt;
 + 	const char *buf;
 + 	size_t count;
-+@@ -160,6 +177,7 @@ struct fpga_manager_info {
+@@ -160,6 +173,7 @@ struct fpga_manager_info {
 +  * @write: write count bytes of configuration data to the FPGA
 +  * @write_sg: write the scatter list of configuration data to the FPGA
 +  * @write_complete: set FPGA to operating state after writing is done
@ -1021,7 +1010,7 @@ index 0000000..33daffe
 +  * @fpga_remove: optional: Set FPGA into a specific state during driver remove
 +  * @groups: optional attribute groups.
 +  *
-+@@ -182,6 +200,7 @@ struct fpga_manager_ops {
+@@ -182,6 +196,7 @@ struct fpga_manager_ops {
 + 	int (*write_sg)(struct fpga_manager *mgr, struct sg_table *sgt);
 + 	int (*write_complete)(struct fpga_manager *mgr,
 + 			      struct fpga_image_info *info);
@ -1029,7 +1018,7 @@ index 0000000..33daffe
 + 	void (*fpga_remove)(struct fpga_manager *mgr);
 + 	const struct attribute_group **groups;
 + };
-+@@ -196,23 +215,37 @@ struct fpga_manager_ops {
+@@ -196,21 +211,35 @@ struct fpga_manager_ops {
 + /**
 +  * struct fpga_manager - fpga manager structure
 +  * @name: name of low level fpga manager
@ -1042,7 +1031,6 @@ index 0000000..33daffe
 +  * @state: state of fpga manager
 +  * @compat_id: FPGA manager id for compatibility check.
 +  * @mops: pointer to struct of fpga manager ops
-+  * @mops_owner: module containing the mops
 +  * @priv: low level driver private date
 ++ * @err: low level driver error code
 ++ * @dir: debugfs image directory
@ -1058,7 +1046,6 @@ index 0000000..33daffe
 + 	enum fpga_mgr_states state;
 + 	struct fpga_compat_id *compat_id;
 + 	const struct fpga_manager_ops *mops;
-+ 	struct module *mops_owner;
 + 	void *priv;
 ++	int err;
 ++#ifdef CONFIG_FPGA_MGR_DEBUG_FS
@ -1067,21 +1054,21 @@ index 0000000..33daffe
 + };
 + 
 + #define to_fpga_manager(d) container_of(d, struct fpga_manager, dev)
-+@@ -258,4 +291,6 @@ __devm_fpga_mgr_register(struct device *parent, const char *name,
-+ 			 const struct fpga_manager_ops *mops, void *priv,
-+ 			 struct module *owner);
+@@ -244,4 +273,6 @@ struct fpga_manager *
+ devm_fpga_mgr_register(struct device *parent, const char *name,
+ 		       const struct fpga_manager_ops *mops, void *priv);
 + 
 ++#define FPGA_IOCTL_LOAD_DMA_BUFF	_IOWR('R', 1, __u32)
 ++
 + #endif /*_LINUX_FPGA_MGR_H */
 diff --git a/zynq_image.nix b/zynq_image.nix
-index d5c5eda..7ede584 100644
+index 9d1621e..012e50c 100644
 --- a/zynq_image.nix
 +++ b/zynq_image.nix
@@ -3,6 +3,16 @@
 with lib;
 let
-   customKernel = (pkgs.linux_6_6.override {
+   customKernel = (pkgs.linux.override {
 +    kernelPatches = [
 +      ({
 +        name = "xilinx-configfs-overlays";