make: change main target names to avoid collision

* libcortexa9 mutex behavior understood
* io.until replaced with spinlock

README.md

@@ -24,7 +24,7 @@ The following configuration keys are available:
 - ``ip``: IPv4 address.
 - ``ip6``: IPv6 address.
 - ``startup``: startup kernel in ELF format (as produced by ``artiq_compile``).
-- ``rtio_clock``: source of RTIO clock; valid values are ``ext0_bypass`` and ``int_125``.
+- ``rtioclk``: source of RTIO clock; valid values are ``external`` and ``internal``.
 - ``boot``: SD card "boot.bin" file, for replacing the boot firmware/gateware. Write only.
 
 Configurations can be read/written/removed via ``artiq_coremgmt``. Config erase is
@@ -45,7 +45,7 @@ Note: if you are using Nix channels the first time, you need to be aware of this
 Pure build with Nix and execution on a remote JTAG server:
 
 ```shell
-nix-build -A zc706-nist_clock-jtag  # or zc706-nist_qc2-jtag or zc706-nist_clock_satellite-jtag etc.
+nix-build -A zc706-simple-jtag  # or zc706-nist_qc2-jtag or zc706-nist_clock-jtag
 ./remote_run.sh
 ```
 
@@ -54,23 +54,19 @@ Impure incremental build and execution on a remote JTAG server:
 ```shell
 nix-shell
 cd src
-gateware/zc706.py -g ../build/gateware -v <variant> # build gateware
-make GWARGS="-V <variant>" <runtime/satman>    # build firmware
+gateware/zc706.py -g ../build/gateware  # build gateware
+make                                    # build firmware
 cd ..
 ./remote_run.sh -i
 ```
 
 Notes:
 
-- This is developed with Nixpkgs 21.05[^1], and the ``nixbld.m-labs.hk`` binary substituter can also be used here (see the ARTIQ manual for the public key and instructions).
+- This is developed with Nixpkgs 21.05, and the ``nixbld.m-labs.hk`` binary substituter can also be used here (see the ARTIQ manual for the public key and instructions).
 - The impure build process is also compatible with non-Nix systems.
-- When calling make, you need to specify both the variant and firmware type.
-- Firmware type must be either ``runtime`` for DRTIO-less or DRTIO master variants, or ``satman`` for DRTIO satellite.
 - If the board is connected to the local machine, use the ``local_run.sh`` script.
 - To update ``zynq-rs``, update the cargo files as per usual for Rust projects, but also keep ``zynq-rs.nix`` in sync.
 
-[^1]: Thus, on newer version of NixOS, you should run `nix-shell -I nixpkgs=https://github.com/NixOS/nixpkgs/archive/21.05.tar.gz` instead
-
 License
 -------
 

default.nix

@@ -8,13 +8,7 @@ let
   vivado = import <artiq-fast/vivado.nix> { inherit pkgs; };
   # FSBL configuration supplied by Vivado 2020.1 for these boards:
   fsblTargets = ["zc702" "zc706" "zed"];
-  sat_variants = [
-    # kasli-soc satellite variants
-    "satellite"
-    # zc706 satellite variants
-    "nist_clock_satellite" "nist_qc2_satellite" "acpki_nist_clock_satellite" "acpki_nist_qc2_satellite" 
-    "nist_clock_satellite_100mhz" "nist_qc2_satellite_100mhz" "acpki_nist_clock_satellite_100mhz" "acpki_nist_qc2_satellite_100mhz"
-  ];
+  sat_variants = ["satellite" "acpki_satellite" "nist_clock_satellite" "nist_qc2_satellite"];
   build = { target, variant, json ? null }: let
     szl = (import zynq-rs)."${target}-szl";
     fsbl = import "${zynq-rs}/nix/fsbl.nix" {
@@ -28,7 +22,7 @@ let
       name = "firmware";
 
       src = ./src;
-      cargoSha256 = "sha256-uiwESZNwPdVnDkA1n0v1DQHp3rTazDkgIYscVTpgNq0=";
+      cargoSha256 = "0p9d2j7qp00wpxm48phl5rq26simzry6w0m673lyhrlbzqdz4frb";
 
       nativeBuildInputs = [
         pkgs.gnumake
@@ -41,7 +35,7 @@ let
         export XARGO_RUST_SRC="${rustPlatform.rust.rustc}/lib/rustlib/src/rust/library"
         export CLANG_EXTRA_INCLUDE_DIR="${pkgs.llvmPackages_9.clang-unwrapped.lib}/lib/clang/9.0.1/include"
         export CARGO_HOME=$(mktemp -d cargo-home.XXX)
-        make TARGET=${target} GWARGS="${if json == null then "-V ${variant}" else json}" ${fwtype}
+        make TARGET=${target} GWARGS="${if json == null then "-V ${variant}" else json}" ${fwtype}_target
       '';
 
       installPhase = ''
@@ -87,14 +81,14 @@ let
       bifdir=`mktemp -d`
       cd $bifdir
       ln -s ${szl}/szl.elf szl.elf
-      ln -s ${firmware}/${fwtype}.elf ${fwtype}.elf
+      ln -s ${firmware}/runtime.elf runtime.elf
       ln -s ${gateware}/top.bit top.bit
       cat > boot.bif << EOF
       the_ROM_image:
       {
         [bootloader]szl.elf
         top.bit
-        ${fwtype}.elf
+        runtime.elf
       }
       EOF
       mkdir $out $out/nix-support
@@ -112,13 +106,13 @@ let
       cd $bifdir
       ln -s ${fsbl}/fsbl.elf fsbl.elf
       ln -s ${gateware}/top.bit top.bit
-      ln -s ${firmware}/${fwtype}.elf ${fwtype}.elf
+      ln -s ${firmware}/runtime.elf runtime.elf
       cat > boot.bif << EOF
       the_ROM_image:
       {
         [bootloader]fsbl.elf
         top.bit
-        ${fwtype}.elf
+        runtime.elf
       }
       EOF
       mkdir $out $out/nix-support
@@ -139,22 +133,24 @@ let
   );
 in
   (
+    (build { target = "zc706"; variant = "simple"; }) //
+    (build { target = "zc706"; variant = "master"; }) //
+    (build { target = "zc706"; variant = "satellite"; }) //
     (build { target = "zc706"; variant = "nist_clock"; }) //
     (build { target = "zc706"; variant = "nist_clock_master"; }) //
     (build { target = "zc706"; variant = "nist_clock_satellite"; }) //
-    (build { target = "zc706"; variant = "nist_clock_satellite_100mhz"; }) //
     (build { target = "zc706"; variant = "nist_qc2"; }) //
     (build { target = "zc706"; variant = "nist_qc2_master"; }) //
     (build { target = "zc706"; variant = "nist_qc2_satellite"; }) //
-    (build { target = "zc706"; variant = "nist_qc2_satellite_100mhz"; }) //
+    (build { target = "zc706"; variant = "acpki_simple"; }) //
+    (build { target = "zc706"; variant = "acpki_master"; }) //
+    (build { target = "zc706"; variant = "acpki_satellite"; }) //
     (build { target = "zc706"; variant = "acpki_nist_clock"; }) //
     (build { target = "zc706"; variant = "acpki_nist_clock_master"; }) //
     (build { target = "zc706"; variant = "acpki_nist_clock_satellite"; }) //
-    (build { target = "zc706"; variant = "acpki_nist_clock_satellite_100mhz"; }) //
     (build { target = "zc706"; variant = "acpki_nist_qc2"; }) //
     (build { target = "zc706"; variant = "acpki_nist_qc2_master"; }) //
     (build { target = "zc706"; variant = "acpki_nist_qc2_satellite"; }) //
-    (build { target = "zc706"; variant = "acpki_nist_qc2_satellite_100mhz"; }) //
     (build { target = "kasli_soc"; variant = "demo"; json = ./demo.json; }) //
     (build { target = "kasli_soc"; variant = "master"; json = ./kasli-soc-master.json; }) //
     (build { target = "kasli_soc"; variant = "satellite"; json = ./kasli-soc-satellite.json; }) //

examples/device_db.py

@@ -29,11 +29,30 @@ device_db = {
         "class": "PCA9548"
     },
 
+    # led? are common to all variants
     "led0": {
         "type": "local",
         "module": "artiq.coredevice.ttl",
         "class": "TTLOut",
-        "arguments": {"channel": 41},
+        "arguments": {"channel": 0},
+    },
+    "led1": {
+        "type": "local",
+        "module": "artiq.coredevice.ttl",
+        "class": "TTLOut",
+        "arguments": {"channel": 1},
+    },
+    "led2": {
+        "type": "local",
+        "module": "artiq.coredevice.ttl",
+        "class": "TTLOut",
+        "arguments": {"channel": 2}
+    },
+    "led3": {
+        "type": "local",
+        "module": "artiq.coredevice.ttl",
+        "class": "TTLOut",
+        "arguments": {"channel": 3}
     },
 }
 
@@ -43,7 +62,7 @@ for i in range(40):
         "type": "local",
         "module": "artiq.coredevice.ttl",
         "class": "TTLInOut",
-        "arguments": {"channel": i}
+        "arguments": {"channel": 4+i}
     }
 
 device_db["ad9914dds0"] = {

src/Makefile

@@ -1,19 +1,20 @@
 TARGET := zc706
-GWARGS := -V nist_clock
+GWARGS := -V simple
 
 all: runtime
 
-runtime: ../build/runtime.bin
+runtime_target: ../build/runtime.bin
 
-satman: ../build/satman.bin
+satman_target: ../build/satman.bin
+
+.PHONY: all
 
-.PHONY: all runtime_target satman_target
 
 ../build/pl.rs ../build/rustc-cfg ../build/mem.rs: gateware/* 
 	mkdir -p ../build
 	python gateware/$(TARGET).py -r ../build/pl.rs -c ../build/rustc-cfg -m ../build/mem.rs $(GWARGS)
 
-../build/firmware/armv7-none-eabihf/release/runtime: ../build/pl.rs ../build/rustc-cfg ../build/mem.rs $(shell find . -type f -print)
+../build/firmware/armv7-none-eabihf/release/runtime: ../build/pl.rs ../build/rustc-cfg ../build/mem.rs $(shell find . -print)
 	cd runtime && \
 	XBUILD_SYSROOT_PATH=`pwd`/../../build/sysroot \
 	cargo xbuild --release \
@@ -23,7 +24,7 @@ satman: ../build/satman.bin
 ../build/runtime.bin: ../build/firmware/armv7-none-eabihf/release/runtime
 	llvm-objcopy -O binary ../build/firmware/armv7-none-eabihf/release/runtime ../build/runtime.bin
 
-../build/firmware/armv7-none-eabihf/release/satman: ../build/pl.rs ../build/rustc-cfg ../build/mem.rs $(shell find . -type f -print)
+../build/firmware/armv7-none-eabihf/release/satman: ../build/pl.rs ../build/rustc-cfg ../build/mem.rs $(shell find . -print)
 	cd satman && \
 	XBUILD_SYSROOT_PATH=`pwd`/../../build/sysroot \
 	cargo xbuild --release \

src/gateware/kasli_soc.py

@@ -15,7 +15,7 @@ from misoc.integration import cpu_interface
 from artiq.coredevice import jsondesc
 from artiq.gateware import rtio, eem_7series
 from artiq.gateware.rtio.phy import ttl_simple
-from artiq.gateware.rtio.xilinx_clocking import RTIOClockMultiplier
+
 from artiq.gateware.drtio.transceiver import gtx_7series
 from artiq.gateware.drtio.siphaser import SiPhaser7Series
 from artiq.gateware.drtio.rx_synchronizer import XilinxRXSynchronizer
@@ -24,7 +24,7 @@ from artiq.gateware.drtio import *
 import dma
 import analyzer
 import acpki
-import drtio_aux_controller
+import aux_controller
 
 class RTIOCRG(Module, AutoCSR):
     def __init__(self, platform):
@@ -76,6 +76,36 @@ class RTIOCRG(Module, AutoCSR):
         ]
 
 
+class _RTIOClockMultiplier(Module, AutoCSR):
+    def __init__(self, rtio_clk_freq):
+        self.pll_reset = CSRStorage(reset=1)
+        self.pll_locked = CSRStatus()
+        self.clock_domains.cd_rtiox4 = ClockDomain(reset_less=True)
+
+        # See "Global Clock Network Deskew Using Two BUFGs" in ug472.
+        clkfbout = Signal()
+        clkfbin = Signal()
+        rtiox4_clk = Signal()
+        pll_locked = Signal()
+        self.specials += [
+            Instance("MMCME2_BASE",
+                p_CLKIN1_PERIOD=1e9/rtio_clk_freq,
+                i_CLKIN1=ClockSignal("rtio"),
+                i_RST=self.pll_reset.storage,
+                o_LOCKED=pll_locked,
+
+                p_CLKFBOUT_MULT_F=8.0, p_DIVCLK_DIVIDE=1,
+
+                o_CLKFBOUT=clkfbout, i_CLKFBIN=clkfbin,
+
+                p_CLKOUT0_DIVIDE_F=2.0, o_CLKOUT0=rtiox4_clk,
+            ),
+            Instance("BUFG", i_I=clkfbout, o_O=clkfbin),
+            Instance("BUFG", i_I=rtiox4_clk, o_O=self.cd_rtiox4.clk),
+
+            MultiReg(pll_locked, self.pll_locked.status)
+        ]
+        
 eem_iostandard_dict = {
      0: "LVDS_25",
      1: "LVDS_25",
@@ -113,8 +143,8 @@ class GenericStandalone(SoCCore):
         platform.add_platform_command("create_clock -name clk_fpga_0 -period 8 [get_pins \"PS7/FCLKCLK[0]\"]")
         platform.add_platform_command("set_input_jitter clk_fpga_0 0.24")
 
-        self.rustc_cfg["has_si5324"] = None
-        self.rustc_cfg["si5324_soft_reset"] = None
+        self.rustc_cfg["HAS_SI5324"] = None
+        self.rustc_cfg["SI5324_SOFT_RESET"] = None
 
         self.crg = self.ps7 # HACK for eem_7series to find the clock
         self.submodules.rtio_crg = RTIOCRG(self.platform)
@@ -180,7 +210,6 @@ class GenericStandalone(SoCCore):
 class GenericMaster(SoCCore):
     def __init__(self, description, acpki=False):
         sys_clk_freq = 125e6
-        rtio_clk_freq = description["rtio_frequency"]
 
         self.acpki = acpki
         self.rustc_cfg = dict()
@@ -197,6 +226,8 @@ class GenericMaster(SoCCore):
         platform.add_platform_command("create_clock -name clk_fpga_0 -period 8 [get_pins \"PS7/FCLKCLK[0]\"]")
         platform.add_platform_command("set_input_jitter clk_fpga_0 0.24")
 
+        # kasli_soc has no SATA, but it has 4x SFP
+        # not sure yet why sfp0 is omitted in MasterMode
         data_pads = [platform.request("sfp", i) for i in range(4)]
 
         self.submodules.drtio_transceiver = gtx_7series.GTX(
@@ -206,8 +237,12 @@ class GenericMaster(SoCCore):
         self.csr_devices.append("drtio_transceiver")
 
         self.crg = self.ps7 # HACK for eem_7series to find the clock
-        self.submodules.rtio_crg = RTIOClockMultiplier(rtio_clk_freq)
+        self.submodules.rtio_crg = RTIOCRG(self.platform)
         self.csr_devices.append("rtio_crg")
+        self.platform.add_period_constraint(self.rtio_crg.cd_rtio.clk, 8.)
+        self.platform.add_false_path_constraints(
+            self.ps7.cd_sys.clk,
+            self.rtio_crg.cd_rtio.clk)
 
         self.rtio_channels = []
         has_grabber = any(peripheral["type"] == "grabber" for peripheral in description["peripherals"])
@@ -244,7 +279,7 @@ class GenericMaster(SoCCore):
             self.drtio_cri.append(core.cri)
             self.csr_devices.append(core_name)
 
-            coreaux = cdr(drtio_aux_controller.DRTIOAuxControllerBare(core.link_layer))
+            coreaux = cdr(aux_controller.DRTIOAuxControllerBare(core.link_layer))
             setattr(self.submodules, coreaux_name, coreaux)
             self.csr_devices.append(coreaux_name)
 
@@ -295,12 +330,15 @@ class GenericMaster(SoCCore):
         if has_grabber:
             self.rustc_cfg["has_grabber"] = None
             self.add_csr_group("grabber", self.grabber_csr_group)
+            for grabber in self.grabber_csr_group:
+                self.platform.add_false_path_constraints(
+                    self.rtio_crg.cd_rtio.clk, getattr(self, grabber).deserializer.cd_cl.clk)
 
 
 class GenericSatellite(SoCCore):
     def __init__(self, description, acpki=False):
         sys_clk_freq = 125e6  
-        rtio_clk_freq = description["rtio_frequency"]
+        rtio_clk_freq = 125e6
 
         self.acpki = acpki
         self.rustc_cfg = dict()
@@ -318,7 +356,7 @@ class GenericSatellite(SoCCore):
         platform.add_platform_command("set_input_jitter clk_fpga_0 0.24")
 
         self.crg = self.ps7 # HACK for eem_7series to find the clock
-        self.submodules.rtio_crg = RTIOClockMultiplier(rtio_clk_freq)
+        self.submodules.rtio_crg = _RTIOClockMultiplier(rtio_clk_freq)
         self.csr_devices.append("rtio_crg")
         
         data_pads = [platform.request("sfp", i) for i in range(4)]
@@ -374,7 +412,7 @@ class GenericSatellite(SoCCore):
                 self.drtio_cri.append(core.cri)
                 self.csr_devices.append(corerep_name)
 
-            coreaux = cdr(drtio_aux_controller.DRTIOAuxControllerBare(core.link_layer))
+            coreaux = cdr(aux_controller.DRTIOAuxControllerBare(core.link_layer))
             setattr(self.submodules, coreaux_name, coreaux)
             self.csr_devices.append(coreaux_name)
 
@@ -393,9 +431,6 @@ class GenericSatellite(SoCCore):
         self.add_memory_group("drtioaux_mem", drtioaux_memory_group)
         self.add_csr_group("drtiorep", drtiorep_csr_group)
 
-        self.rustc_cfg["has_si5324"] = None
-        self.rustc_cfg["si5324_soft_reset"] = None
-
         if self.acpki:
             self.rustc_cfg["ki_impl"] = "acp"
             self.submodules.rtio = acpki.KernelInitiator(self.rtio_tsc,

src/gateware/zc706.py

@@ -15,7 +15,7 @@ from misoc.cores import gpio
 
 from artiq.gateware import rtio, nist_clock, nist_qc2
 from artiq.gateware.rtio.phy import ttl_simple, ttl_serdes_7series, dds, spi2
-from artiq.gateware.rtio.xilinx_clocking import RTIOClockMultiplier, fix_serdes_timing_path
+
 from artiq.gateware.drtio.transceiver import gtx_7series
 from artiq.gateware.drtio.siphaser import SiPhaser7Series
 from artiq.gateware.drtio.rx_synchronizer import XilinxRXSynchronizer
@@ -24,8 +24,7 @@ from artiq.gateware.drtio import *
 import dma
 import analyzer
 import acpki
-import drtio_aux_controller
-
+import aux_controller
 
 class RTIOCRG(Module, AutoCSR):
     def __init__(self, platform, rtio_internal_clk):
@@ -71,6 +70,48 @@ class RTIOCRG(Module, AutoCSR):
         ]
 
 
+class _RTIOClockMultiplier(Module, AutoCSR):
+    def __init__(self, rtio_clk_freq):
+        self.pll_reset = CSRStorage(reset=1)
+        self.pll_locked = CSRStatus()
+        self.clock_domains.cd_rtiox4 = ClockDomain(reset_less=True)
+
+        # See "Global Clock Network Deskew Using Two BUFGs" in ug472.
+        clkfbout = Signal()
+        clkfbin = Signal()
+        rtiox4_clk = Signal()
+        pll_locked = Signal()
+        self.specials += [
+            Instance("MMCME2_BASE",
+                p_CLKIN1_PERIOD=1e9/rtio_clk_freq,
+                i_CLKIN1=ClockSignal("rtio"),
+                i_RST=self.pll_reset.storage,
+                o_LOCKED=pll_locked,
+
+                p_CLKFBOUT_MULT_F=8.0, p_DIVCLK_DIVIDE=1,
+
+                o_CLKFBOUT=clkfbout, i_CLKFBIN=clkfbin,
+
+                p_CLKOUT0_DIVIDE_F=2.0, o_CLKOUT0=rtiox4_clk,
+            ),
+            Instance("BUFG", i_I=clkfbout, o_O=clkfbin),
+            Instance("BUFG", i_I=rtiox4_clk, o_O=self.cd_rtiox4.clk),
+
+            MultiReg(pll_locked, self.pll_locked.status)
+        ]
+
+
+def fix_serdes_timing_path(platform):
+    # ignore timing of path from OSERDESE2 through the pad to ISERDESE2
+    platform.add_platform_command(
+        "set_false_path -quiet "
+        "-through [get_pins -filter {{REF_PIN_NAME == OQ || REF_PIN_NAME == TQ}} "
+            "-of [get_cells -filter {{REF_NAME == OSERDESE2}}]] "
+        "-to [get_pins -filter {{REF_PIN_NAME == D}} "
+            "-of [get_cells -filter {{REF_NAME == ISERDESE2}}]]"
+    )
+
+
 # The NIST backplanes require setting VADJ to 3.3V by reprogramming the power supply.
 # This also changes the I/O standard for some on-board LEDs.
 leds_fmc33 = [
@@ -88,35 +129,6 @@ si5324_fmc33 = [
     ),
 ]
 
-pmod1_33 = [
-    ("pmod1_33", 0, Pins("AJ21"), IOStandard("LVCMOS33")),
-    ("pmod1_33", 1, Pins("AK21"), IOStandard("LVCMOS33")),
-    ("pmod1_33", 2, Pins("AB21"), IOStandard("LVCMOS33")),
-    ("pmod1_33", 3, Pins("AB16"), IOStandard("LVCMOS33")),
-    # rest removed for use with dummy spi
-]
-
-_ams101_dac = [
-    ("ams101_dac", 0,
-        Subsignal("ldac", Pins("XADC:GPIO0")),
-        Subsignal("clk", Pins("XADC:GPIO1")),
-        Subsignal("mosi", Pins("XADC:GPIO2")),
-        Subsignal("cs_n", Pins("XADC:GPIO3")),
-        IOStandard("LVCMOS15")
-     )
-]
-
-_pmod_spi = [ 
-    ("pmod_spi", 0,
-        # PMOD_1 4-7 pins, same bank as sfp_tx_disable or user_sma_clock
-        Subsignal("miso", Pins("Y20"), IOStandard("LVCMOS25")),
-        Subsignal("clk", Pins("AA20"), IOStandard("LVCMOS25")),
-        Subsignal("mosi", Pins("AC18"), IOStandard("LVCMOS25")),
-        Subsignal("cs_n", Pins("AC19"), IOStandard("LVCMOS25")),
-        IOStandard("LVCMOS25")
-    )
-]
-
 
 def prepare_zc706_platform(platform):
     platform.toolchain.bitstream_commands.extend([
@@ -124,6 +136,7 @@ def prepare_zc706_platform(platform):
     ])
     platform.add_platform_command("create_clock -name clk_fpga_0 -period 8 [get_pins \"PS7/FCLKCLK[0]\"]")
     platform.add_platform_command("set_input_jitter clk_fpga_0 0.24")
+    return platform
 
 
 class ZC706(SoCCore):
@@ -132,7 +145,7 @@ class ZC706(SoCCore):
         self.rustc_cfg = dict()
 
         platform = zc706.Platform()
-        prepare_zc706_platform(platform)
+        platform = prepare_zc706_platform(platform)
 
         ident = self.__class__.__name__
         if self.acpki:
@@ -181,36 +194,37 @@ class ZC706(SoCCore):
 
 
 class _MasterBase(SoCCore):
-    def __init__(self, acpki=False, drtio100mhz=False):
+    def __init__(self, acpki=False, use_si5324_33=False):
         self.acpki = acpki
         self.rustc_cfg = dict()
 
         platform = zc706.Platform()
-        prepare_zc706_platform(platform)
+        platform = prepare_zc706_platform(platform)
         ident = self.__class__.__name__
         if self.acpki:
             ident = "acpki_" + ident
         SoCCore.__init__(self, platform=platform, csr_data_width=32, ident=ident)
 
-        platform.add_extension(si5324_fmc33)
+        platform.add_platform_command("create_clock -name clk_fpga_0 -period 8 [get_pins \"PS7/FCLKCLK[0]\"]")
+        platform.add_platform_command("set_input_jitter clk_fpga_0 0.24")
+
+        if use_si5324_33:
+            platform.add_extension(si5324_fmc33)
 
         self.sys_clk_freq = 125e6
-        rtio_clk_freq = 100e6 if drtio100mhz else self.sys_clk_freq
 
         platform = self.platform
 
         self.comb += platform.request("sfp_tx_disable_n").eq(1)
         data_pads = [
-            platform.request("sfp"),
-            platform.request("user_sma_mgt")
+            platform.request("sfp")
         ]
 
         # 1000BASE_BX10 Ethernet compatible, 125MHz RTIO clock
         self.submodules.drtio_transceiver = gtx_7series.GTX(
             clock_pads=platform.request("si5324_clkout"),
             pads=data_pads,
-            sys_clk_freq=self.sys_clk_freq,
-            rtio_clk_freq=rtio_clk_freq)
+            sys_clk_freq=self.sys_clk_freq)
         self.csr_devices.append("drtio_transceiver")
 
         self.submodules.rtio_tsc = rtio.TSC("async", glbl_fine_ts_width=3)
@@ -235,7 +249,7 @@ class _MasterBase(SoCCore):
             self.drtio_cri.append(core.cri)
             self.csr_devices.append(core_name)
 
-            coreaux = cdr(drtio_aux_controller.DRTIOAuxControllerBare(core.link_layer))
+            coreaux = cdr(aux_controller.DRTIOAuxControllerBare(core.link_layer))
             setattr(self.submodules, coreaux_name, coreaux)
             self.csr_devices.append(coreaux_name)
 
@@ -249,9 +263,12 @@ class _MasterBase(SoCCore):
         self.add_csr_group("drtioaux", drtioaux_csr_group)
         self.add_memory_group("drtioaux_mem", drtioaux_memory_group)
 
-        self.rustc_cfg["rtio_frequency"] = str(self.drtio_transceiver.rtio_clk_freq/1e6)
+        self.rustc_cfg["RTIO_FREQUENCY"] = str(self.drtio_transceiver.rtio_clk_freq/1e6)
 
-        self.submodules.si5324_rst_n = gpio.GPIOOut(platform.request("si5324_33").rst_n)
+        if use_si5324_33:
+            self.submodules.si5324_rst_n = gpio.GPIOOut(platform.request("si5324_33").rst_n)
+        else:
+            self.submodules.si5324_rst_n = gpio.GPIOOut(platform.request("si5324").rst_n)
         self.csr_devices.append("si5324_rst_n")
         self.rustc_cfg["has_si5324"] = None
         self.rustc_cfg["si5324_as_synthesizer"] = None
@@ -272,7 +289,7 @@ class _MasterBase(SoCCore):
             platform.add_false_path_constraints(
                 self.ps7.cd_sys.clk, gtx0.txoutclk, gtx.rxoutclk)
 
-        self.submodules.rtio_crg = RTIOClockMultiplier(self.sys_clk_freq)
+        self.submodules.rtio_crg = _RTIOClockMultiplier(self.sys_clk_freq)
         self.csr_devices.append("rtio_crg")
         fix_serdes_timing_path(self.platform)
 
@@ -315,28 +332,27 @@ class _MasterBase(SoCCore):
 
 
 class _SatelliteBase(SoCCore):
-    def __init__(self, acpki=False, drtio100mhz=False):
+    def __init__(self, acpki=False, use_si5324_33=False):
         self.acpki = acpki
         self.rustc_cfg = dict()
 
         platform = zc706.Platform()
-        prepare_zc706_platform(platform)
+        platform = prepare_zc706_platform(platform)
         ident = self.__class__.__name__
         if self.acpki:
             ident = "acpki_" + ident
         SoCCore.__init__(self, platform=platform, csr_data_width=32, ident=ident)
 
-        platform.add_extension(si5324_fmc33)
+        if use_si5324_33:
+            platform.add_extension(si5324_fmc33)
 
         self.sys_clk_freq = 125e6
-        rtio_clk_freq = 100e6 if drtio100mhz else self.sys_clk_freq
         platform = self.platform
 
         # SFP
         self.comb += platform.request("sfp_tx_disable_n").eq(0)
         data_pads = [
-            platform.request("sfp"),
-            platform.request("user_sma_mgt")
+            platform.request("sfp")
         ]
 
         self.submodules.rtio_tsc = rtio.TSC("sync", glbl_fine_ts_width=3)
@@ -345,13 +361,11 @@ class _SatelliteBase(SoCCore):
         self.submodules.drtio_transceiver = gtx_7series.GTX(
             clock_pads=platform.request("si5324_clkout"),
             pads=data_pads,
-            sys_clk_freq=self.sys_clk_freq,
-            rtio_clk_freq=rtio_clk_freq)
+            sys_clk_freq=self.sys_clk_freq)
         self.csr_devices.append("drtio_transceiver")
 
         drtioaux_csr_group = []
         drtioaux_memory_group = []
-        drtiorep_csr_group = []
         self.drtio_cri = []
         for i in range(len(self.drtio_transceiver.channels)):
             coreaux_name = "drtioaux" + str(i)
@@ -368,17 +382,10 @@ class _SatelliteBase(SoCCore):
                     self.rtio_tsc, self.drtio_transceiver.channels[0], self.rx_synchronizer))
                 self.submodules.drtiosat = core
                 self.csr_devices.append("drtiosat")
-            # Repeaters
-            else:
-                corerep_name = "drtiorep" + str(i-1)
-                drtiorep_csr_group.append(corerep_name)
-                core = cdr(DRTIORepeater(
-                    self.rtio_tsc, self.drtio_transceiver.channels[i]))
-                setattr(self.submodules, corerep_name, core)
-                self.drtio_cri.append(core.cri)
-                self.csr_devices.append(corerep_name)
+            # Repeaters - there would be for i != 0 - however zc706 only has one SFP
+            # and no other means to connect to 
 
-            coreaux = cdr(drtio_aux_controller.DRTIOAuxControllerBare(core.link_layer))
+            coreaux = cdr(aux_controller.DRTIOAuxControllerBare(core.link_layer))
             setattr(self.submodules, coreaux_name, coreaux)
             self.csr_devices.append(coreaux_name)
 
@@ -392,9 +399,8 @@ class _SatelliteBase(SoCCore):
             # manually, because software refers to rx/tx by halves of entire memory block, not names
             self.add_memory_region(memory_name, self.mem_map["csr"] + memory_address, mem_size * 2)
         self.rustc_cfg["has_drtio"] = None
-        self.rustc_cfg["has_drtio_routing"] = None
+        # no repeaters - it does not have drtio routing support
         self.add_csr_group("drtioaux", drtioaux_csr_group)
-        self.add_csr_group("drtiorep", drtiorep_csr_group)
         self.add_memory_group("drtioaux_mem", drtioaux_memory_group)
 
         self.rustc_cfg["rtio_frequency"] = str(self.drtio_transceiver.rtio_clk_freq/1e6)
@@ -408,7 +414,10 @@ class _SatelliteBase(SoCCore):
         platform.add_false_path_constraints(
             self.ps7.cd_sys.clk, self.siphaser.mmcm_freerun_output)
         self.csr_devices.append("siphaser")
-        self.submodules.si5324_rst_n = gpio.GPIOOut(platform.request("si5324_33").rst_n)
+        if use_si5324_33:
+            self.submodules.si5324_rst_n = gpio.GPIOOut(platform.request("si5324_33").rst_n)
+        else:
+            self.submodules.si5324_rst_n = gpio.GPIOOut(platform.request("si5324").rst_n)
         self.csr_devices.append("si5324_rst_n")
         self.rustc_cfg["has_si5324"] = None
         self.rustc_cfg["has_siphaser"] = None
@@ -429,7 +438,7 @@ class _SatelliteBase(SoCCore):
             platform.add_false_path_constraints(
                 self.ps7.cd_sys.clk, gtx.rxoutclk)
 
-        self.submodules.rtio_crg = RTIOClockMultiplier(self.sys_clk_freq)
+        self.submodules.rtio_crg = _RTIOClockMultiplier(self.sys_clk_freq)
         self.csr_devices.append("rtio_crg")
         fix_serdes_timing_path(self.platform)
 
@@ -460,6 +469,21 @@ class _SatelliteBase(SoCCore):
         self.csr_devices.append("routing_table")
 
 
+class _Simple_RTIO:
+    def __init__(self):
+        platform = self.platform
+
+        rtio_channels = []
+        for i in range(4):
+            phy = ttl_simple.Output(platform.request("user_led", i))
+            self.submodules += phy
+            rtio_channels.append(rtio.Channel.from_phy(phy))
+
+        self.config["RTIO_LOG_CHANNEL"] = len(rtio_channels)
+        rtio_channels.append(rtio.LogChannel())
+
+        self.add_rtio(rtio_channels)
+
 
 class _NIST_CLOCK_RTIO:
     """
@@ -469,12 +493,14 @@ class _NIST_CLOCK_RTIO:
         platform = self.platform
         platform.add_extension(nist_clock.fmc_adapter_io)
         platform.add_extension(leds_fmc33)
-        platform.add_extension(pmod1_33)
-        platform.add_extension(_ams101_dac)
-        platform.add_extension(_pmod_spi)
 
         rtio_channels = []
 
+        for i in range(4):
+            phy = ttl_simple.Output(platform.request("user_led_33", i))
+            self.submodules += phy
+            rtio_channels.append(rtio.Channel.from_phy(phy))
+
         for i in range(16):
             if i % 4 == 3:
                 phy = ttl_serdes_7series.InOut_8X(platform.request("ttl", i))
@@ -490,40 +516,16 @@ class _NIST_CLOCK_RTIO:
             self.submodules += phy
             rtio_channels.append(rtio.Channel.from_phy(phy, ififo_depth=512))
 
-        # no SMA GPIO, replaced with PMOD1_0
-        phy = ttl_serdes_7series.InOut_8X(platform.request("pmod1_33", 0))
-        self.submodules += phy
-        rtio_channels.append(rtio.Channel.from_phy(phy, ififo_depth=512))
-
-        phy = ttl_simple.Output(platform.request("user_led_33", 0))
-        self.submodules += phy
-        rtio_channels.append(rtio.Channel.from_phy(phy))
-
-        ams101_dac = self.platform.request("ams101_dac", 0)
-        phy = ttl_simple.Output(ams101_dac.ldac)
-        self.submodules += phy
-        rtio_channels.append(rtio.Channel.from_phy(phy))
-
         phy = ttl_simple.ClockGen(platform.request("la32_p"))
         self.submodules += phy
         rtio_channels.append(rtio.Channel.from_phy(phy))
 
-        phy = spi2.SPIMaster(ams101_dac)
-        self.submodules += phy
-        rtio_channels.append(rtio.Channel.from_phy(
-            phy, ififo_depth=4))
-
         for i in range(3):
             phy = spi2.SPIMaster(self.platform.request("spi", i))
             self.submodules += phy
             rtio_channels.append(rtio.Channel.from_phy(
                 phy, ififo_depth=128))
 
-        # no SDIO on PL side, dummy SPI placeholder instead
-        phy = spi2.SPIMaster(platform.request("pmod_spi"))
-        self.submodules += phy
-        rtio_channels.append(rtio.Channel.from_phy(phy, ififo_depth=4))
-
         phy = dds.AD9914(platform.request("dds"), 11, onehot=True)
         self.submodules += phy
         rtio_channels.append(rtio.Channel.from_phy(phy, ififo_depth=4))
@@ -543,31 +545,20 @@ class _NIST_QC2_RTIO:
         platform = self.platform
         platform.add_extension(nist_qc2.fmc_adapter_io)
         platform.add_extension(leds_fmc33)
-        platform.add_extension(_ams101_dac)
-        platform.add_extension(pmod1_33)
 
         rtio_channels = []
 
+        for i in range(4):
+            phy = ttl_simple.Output(platform.request("user_led_33", i))
+            self.submodules += phy
+            rtio_channels.append(rtio.Channel.from_phy(phy))
+
         # All TTL channels are In+Out capable
         for i in range(40):
             phy = ttl_serdes_7series.InOut_8X(platform.request("ttl", i))
             self.submodules += phy
             rtio_channels.append(rtio.Channel.from_phy(phy, ififo_depth=512))
 
-        # no SMA GPIO, replaced with PMOD1_0
-        phy = ttl_serdes_7series.InOut_8X(platform.request("pmod1_33", 0))
-        self.submodules += phy
-        rtio_channels.append(rtio.Channel.from_phy(phy, ififo_depth=512))
-
-        phy = ttl_simple.Output(platform.request("user_led_33", 0))
-        self.submodules += phy
-        rtio_channels.append(rtio.Channel.from_phy(phy))
-
-        ams101_dac = self.platform.request("ams101_dac", 0)
-        phy = ttl_simple.Output(ams101_dac.ldac)
-        self.submodules += phy
-        rtio_channels.append(rtio.Channel.from_phy(phy))
-
         # CLK0, CLK1 are for clock generators, on backplane SMP connectors
         for i in range(2):
             phy = ttl_simple.ClockGen(
@@ -575,11 +566,6 @@ class _NIST_QC2_RTIO:
             self.submodules += phy
             rtio_channels.append(rtio.Channel.from_phy(phy))
 
-        phy = spi2.SPIMaster(ams101_dac)
-        self.submodules += phy
-        rtio_channels.append(rtio.Channel.from_phy(
-            phy, ififo_depth=4))
-
         for i in range(4):
             phy = spi2.SPIMaster(self.platform.request("spi", i))
             self.submodules += phy
@@ -598,37 +584,55 @@ class _NIST_QC2_RTIO:
         self.add_rtio(rtio_channels)
 
 
+class Simple(ZC706, _Simple_RTIO):
+    def __init__(self, acpki):
+        ZC706.__init__(self, acpki)
+        _Simple_RTIO.__init__(self)
+
+class Master(_MasterBase, _Simple_RTIO):
+    def __init__(self, acpki):
+        _MasterBase.__init__(self, acpki, use_si5324_33=False)
+        _Simple_RTIO.__init__(self)
+
+class Satellite(_SatelliteBase, _Simple_RTIO):
+    def __init__(self, acpki):
+        _SatelliteBase.__init__(self, acpki, use_si5324_33=False)
+        _Simple_RTIO.__init__(self)
+
 class NIST_CLOCK(ZC706, _NIST_CLOCK_RTIO):
-    def __init__(self, acpki, drtio100mhz):
+    def __init__(self, acpki):
         ZC706.__init__(self, acpki)
         _NIST_CLOCK_RTIO.__init__(self)
 
 class NIST_CLOCK_Master(_MasterBase, _NIST_CLOCK_RTIO):
-    def __init__(self, acpki, drtio100mhz):
-        _MasterBase.__init__(self, acpki, drtio100mhz)
+    def __init__(self, acpki):
+        _MasterBase.__init__(self, acpki, use_si5324_33=True)
+
         _NIST_CLOCK_RTIO.__init__(self)
 
 class NIST_CLOCK_Satellite(_SatelliteBase, _NIST_CLOCK_RTIO):
-    def __init__(self, acpki, drtio100mhz):
-        _SatelliteBase.__init__(self, acpki, drtio100mhz)
+    def __init__(self, acpki):
+        _SatelliteBase.__init__(self, acpki, use_si5324_33=True)
         _NIST_CLOCK_RTIO.__init__(self)
 
 class NIST_QC2(ZC706, _NIST_QC2_RTIO):
-    def __init__(self, acpki, drtio100mhz):
+    def __init__(self, acpki):
         ZC706.__init__(self, acpki)
         _NIST_QC2_RTIO.__init__(self)
 
 class NIST_QC2_Master(_MasterBase, _NIST_QC2_RTIO):
-    def __init__(self, acpki, drtio100mhz):
-        _MasterBase.__init__(self, acpki, drtio100mhz)
+    def __init__(self, acpki):
+        _MasterBase.__init__(self, acpki, use_si5324_33=True)
         _NIST_QC2_RTIO.__init__(self)
 
 class NIST_QC2_Satellite(_SatelliteBase, _NIST_QC2_RTIO):
-    def __init__(self, acpki, drtio100mhz):
-        _SatelliteBase.__init__(self, acpki, drtio100mhz)
+    def __init__(self, acpki):
+        _SatelliteBase.__init__(self, acpki, use_si5324_33=True)
         _NIST_QC2_RTIO.__init__(self)
 
-VARIANTS = {cls.__name__.lower(): cls for cls in [NIST_CLOCK, NIST_CLOCK_Master, NIST_CLOCK_Satellite,
+
+VARIANTS = {cls.__name__.lower(): cls for cls in [Simple, Master, Satellite, 
+                                                  NIST_CLOCK, NIST_CLOCK_Master, NIST_CLOCK_Satellite,
                                                   NIST_QC2, NIST_QC2_Master, NIST_QC2_Satellite]}
 
 
@@ -663,9 +667,9 @@ def main():
         help="build Rust compiler configuration into the specified file")
     parser.add_argument("-g", default=None,
         help="build gateware into the specified directory")
-    parser.add_argument("-V", "--variant", default="nist_clock",
+    parser.add_argument("-V", "--variant", default="simple",
                         help="variant: "
-                             "[acpki_]nist_clock/nist_qc2[_master/_satellite][_100mhz]"
+                             "[acpki_]simple/nist_clock/nist_qc2 "
                              "(default: %(default)s)")
     args = parser.parse_args()
 
@@ -673,15 +677,12 @@ def main():
     acpki = variant.startswith("acpki_")
     if acpki:
         variant = variant[6:]
-    drtio100mhz = variant.endswith("_100mhz")
-    if drtio100mhz:
-        variant = variant[:-7]
     try:
         cls = VARIANTS[variant]
     except KeyError:
         raise SystemExit("Invalid variant (-V/--variant)")
 
-    soc = cls(acpki=acpki, drtio100mhz=drtio100mhz)
+    soc = cls(acpki=acpki)
     soc.finalize()
 
     if args.r is not None:

src/libboard_artiq/src/drtioaux.rs

@@ -1,6 +1,7 @@
 use crc;
 
 use core_io::{ErrorKind as IoErrorKind, Error as IoError};
+
 use io::{proto::ProtoRead, proto::ProtoWrite, Cursor};
 use libboard_zynq::{timer::GlobalTimer, time::Milliseconds};
 use crate::mem::mem::DRTIOAUX_MEM;
@@ -57,15 +58,22 @@ pub fn has_rx_error(linkno: u8) -> bool {
     }
 }
 
-pub fn copy_work_buffer(src: *mut u16, dst: *mut u16, len: isize) {
-    // AXI writes must be 4-byte aligned (drtio proto doesn't care for that),
-    // and AXI burst reads/writes are not implemented yet in gateware
-    // thus the need for a work buffer for transmitting and copying it over
+pub fn copy_with_swap(src: *mut u8, dst: *mut u8, len: isize) {
+    // for some reason, everything except checksum arrives
+    // with byte order swapped. and it must be sent as such too.
     unsafe {
-        for i in (0..(len/2)).step_by(2) {
-            *dst.offset(i) = *src.offset(i);
-            *dst.offset(i+1) = *src.offset(i+1);
+        for i in (0..(len-4)).step_by(4) {
+            *dst.offset(i) = *src.offset(i+3);
+            *dst.offset(i+1) = *src.offset(i+2);
+            *dst.offset(i+2) = *src.offset(i+1);
+            *dst.offset(i+3) = *src.offset(i);
         }
+        // checksum untouched
+        // unrolled for performance
+        *dst.offset(len-4) = *src.offset(len-4);
+        *dst.offset(len-3) = *src.offset(len-3);
+        *dst.offset(len-2) = *src.offset(len-2);
+        *dst.offset(len-1) = *src.offset(len-1);
     }
 }
 
@@ -75,11 +83,11 @@ fn receive<F, T>(linkno: u8, f: F) -> Result<Option<T>, Error>
     let linkidx = linkno as usize;
     unsafe {
         if (DRTIOAUX[linkidx].aux_rx_present_read)() == 1 {
-            let ptr = (DRTIOAUX_MEM[linkidx].base + DRTIOAUX_MEM[linkidx].size / 2) as *mut u16;
+            let ptr = (DRTIOAUX_MEM[linkidx].base + DRTIOAUX_MEM[linkidx].size / 2) as *mut u8;
             let len = (DRTIOAUX[linkidx].aux_rx_length_read)() as usize;
-            // work buffer to accomodate axi burst reads
+            // work buffer, as byte order will need to be swapped, cannot be in place
             let mut buf: [u8; 1024] = [0; 1024];
-            copy_work_buffer(ptr, buf.as_mut_ptr() as *mut u16, len as isize);
+            copy_with_swap(ptr, buf.as_mut_ptr(), len as isize);
             let result = f(&buf[0..len]);
             (DRTIOAUX[linkidx].aux_rx_present_write)(1);
             Ok(Some(result?))
@@ -133,12 +141,12 @@ fn transmit<F>(linkno: u8, f: F) -> Result<(), Error>
     let linkno = linkno as usize;
     unsafe {
         while (DRTIOAUX[linkno].aux_tx_read)() != 0 {}
-        let ptr = DRTIOAUX_MEM[linkno].base as *mut u16;
+        let ptr = DRTIOAUX_MEM[linkno].base as *mut u8;
         let len = DRTIOAUX_MEM[linkno].size / 2;
         // work buffer, works with unaligned mem access
         let mut buf: [u8; 1024] = [0; 1024]; 
         let len = f(&mut buf[0..len])?;
-        copy_work_buffer(buf.as_mut_ptr() as *mut u16, ptr, len as isize);
+        copy_with_swap(buf.as_mut_ptr(), ptr, len as isize);
         (DRTIOAUX[linkno].aux_tx_length_write)(len as u16);
         (DRTIOAUX[linkno].aux_tx_write)(1);
         Ok(())

src/libboard_artiq/src/drtioaux_async.rs

@@ -10,7 +10,7 @@ use libasync::{task, block_async};
 use io::{proto::ProtoRead, proto::ProtoWrite, Cursor};
 use crate::mem::mem::DRTIOAUX_MEM;
 use crate::pl::csr::DRTIOAUX;
-use crate::drtioaux::{Error, has_rx_error, copy_work_buffer};
+use crate::drtioaux::{Error, has_rx_error, copy_with_swap};
 
 pub use crate::drtioaux_proto::Packet;
 
@@ -42,11 +42,11 @@ async fn receive<F, T>(linkno: u8, f: F) -> Result<Option<T>, Error>
     let linkidx = linkno as usize;
     unsafe {
         if (DRTIOAUX[linkidx].aux_rx_present_read)() == 1 {
-            let ptr = (DRTIOAUX_MEM[linkidx].base + DRTIOAUX_MEM[linkidx].size / 2) as *mut u16;
+            let ptr = (DRTIOAUX_MEM[linkidx].base + DRTIOAUX_MEM[linkidx].size / 2) as *mut u8;
             let len = (DRTIOAUX[linkidx].aux_rx_length_read)() as usize;
-            // work buffer to accomodate axi burst reads
+            // work buffer, as byte order will need to be swapped, cannot be in place
             let mut buf: [u8; 1024] = [0; 1024];
-            copy_work_buffer(ptr, buf.as_mut_ptr() as *mut u16, len as isize);
+            copy_with_swap(ptr, buf.as_mut_ptr(), len as isize);
             let result = f(&buf[0..len]);
             (DRTIOAUX[linkidx].aux_rx_present_write)(1);
             Ok(Some(result?))
@@ -106,12 +106,12 @@ async fn transmit<F>(linkno: u8, f: F) -> Result<(), Error>
     let linkno = linkno as usize;
     unsafe {
         let _ = block_async!(tx_ready(linkno)).await;
-        let ptr = DRTIOAUX_MEM[linkno].base as *mut u16;
+        let ptr = DRTIOAUX_MEM[linkno].base as *mut u8;
         let len = DRTIOAUX_MEM[linkno].size / 2;
         // work buffer, works with unaligned mem access
         let mut buf: [u8; 1024] = [0; 1024]; 
         let len = f(&mut buf[0..len])?;
-        copy_work_buffer(buf.as_mut_ptr() as *mut u16, ptr, len as isize);
+        copy_with_swap(buf.as_mut_ptr(), ptr, len as isize);
         (DRTIOAUX[linkno].aux_tx_length_write)(len as u16);
         (DRTIOAUX[linkno].aux_tx_write)(1);
         Ok(())

src/libboard_artiq/src/drtioaux_proto.rs

@@ -54,6 +54,8 @@ pub enum Packet {
     SpiReadReply { succeeded: bool, data: u32 },
     SpiBasicReply { succeeded: bool },
 
+    JdacBasicRequest { destination: u8, dacno: u8, reqno: u8, param: u8 },
+    JdacBasicReply { succeeded: bool, retval: u8 },
 }
 
 impl Packet {
@@ -179,6 +181,17 @@ impl Packet {
                 succeeded: reader.read_bool()?
             },
 
+            0xa0 => Packet::JdacBasicRequest {
+                destination: reader.read_u8()?,
+                dacno: reader.read_u8()?,
+                reqno: reader.read_u8()?,
+                param: reader.read_u8()?,
+            },
+            0xa1 => Packet::JdacBasicReply {
+                succeeded: reader.read_bool()?,
+                retval: reader.read_u8()?
+            },
+
             ty => return Err(Error::UnknownPacket(ty))
         })
     }
@@ -332,6 +345,18 @@ impl Packet {
                 writer.write_bool(succeeded)?;
             },
 
+            Packet::JdacBasicRequest { destination, dacno, reqno, param } => {
+                writer.write_u8(0xa0)?;
+                writer.write_u8(destination)?;
+                writer.write_u8(dacno)?;
+                writer.write_u8(reqno)?;
+                writer.write_u8(param)?;
+            }
+            Packet::JdacBasicReply { succeeded, retval } => {
+                writer.write_u8(0xa1)?;
+                writer.write_bool(succeeded)?;
+                writer.write_u8(retval)?;
+            },
         }
         Ok(())
     }

src/libboard_artiq/src/lib.rs

@@ -24,7 +24,6 @@ pub mod si5324;
 pub mod drtioaux;
 #[cfg(has_drtio)]
 pub mod drtioaux_async;
-#[cfg(has_drtio)]
 #[path = "../../../build/mem.rs"]
 pub mod mem;
 

src/libbuild_zynq/lib.rs

@@ -1,22 +1,5 @@
-use std::env;
 use std::fs::File;
-use std::io::{BufRead, BufReader, Write};
-use std::path::PathBuf;
-
-
-pub fn add_linker_script() {
-    // Put the linker script somewhere the linker can find it
-    let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap());
-    File::create(out.join("link.x"))
-        .unwrap()
-        .write_all(include_bytes!("link.x"))
-        .unwrap();
-    println!("cargo:rustc-link-search={}", out.display());
-
-    // Only re-run the build script when link.x is changed,
-    // instead of when any part of the source code changes.
-    println!("cargo:rerun-if-changed=link.x");
-}
+use std::io::{BufRead, BufReader};
 
 pub fn cfg() {
     // Handle rustc-cfg file

src/runtime/build.rs

@@ -1,6 +1,21 @@
+use std::env;
+use std::fs::File;
+use std::io::Write;
+use std::path::PathBuf;
+
 extern crate build_zynq;
 
 fn main() {
-    build_zynq::add_linker_script();
+    // Put the linker script somewhere the linker can find it
+    let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap());
+    File::create(out.join("link.x"))
+        .unwrap()
+        .write_all(include_bytes!("link.x"))
+        .unwrap();
+    println!("cargo:rustc-link-search={}", out.display());
+
+    // Only re-run the build script when link.x is changed,
+    // instead of when any part of the source code changes.
+    println!("cargo:rerun-if-changed=link.x");
     build_zynq::cfg();
 }

src/runtime/src/comms.rs

@@ -30,7 +30,6 @@ use crate::moninj;
 use crate::mgmt;
 use crate::analyzer;
 use crate::rtio_mgt;
-#[cfg(has_drtio)]
 use crate::pl;
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
@@ -224,14 +223,13 @@ async fn handle_run_kernel(stream: Option<&TcpStream>, control: &Rc<RefCell<kern
                     }
                 }
             },
-            kernel::Message::KernelFinished(async_errors) => {
+            kernel::Message::KernelFinished => {
                 if let Some(stream) = stream {
                     write_header(stream, Reply::KernelFinished).await?;
-                    write_i8(stream, async_errors as i8).await?;
                 }
                 break;
             },
-            kernel::Message::KernelException(exception, backtrace, async_errors) => {
+            kernel::Message::KernelException(exception, backtrace) => {
                 match stream {
                     Some(stream) => {
                         // only send the exception data to host if there is host,
@@ -250,7 +248,6 @@ async fn handle_run_kernel(stream: Option<&TcpStream>, control: &Rc<RefCell<kern
                         for &addr in backtrace {
                             write_i32(stream, addr as i32).await?;
                         }
-                        write_i8(stream, async_errors as i8).await?;
                     },
                     None => {
                         error!("Uncaught kernel exception: {:?}", exception);

src/runtime/src/kernel/core1.rs

@@ -14,7 +14,7 @@ use libcortex_a9::{
 use libboard_zynq::{mpcore, gic};
 use libsupport_zynq::ram;
 use dyld::{self, Library};
-use crate::{eh_artiq, get_async_errors, rtio};
+use crate::{eh_artiq, rtio};
 use super::{
     api::resolve,
     rpc::rpc_send_async,
@@ -192,8 +192,7 @@ pub extern "C" fn main_core1() {
                     }
                 }
                 info!("kernel finished");
-                let async_errors = unsafe { get_async_errors() };
-                core1_tx.send(Message::KernelFinished(async_errors));
+                core1_tx.send(Message::KernelFinished);
             }
             _ => error!("Core1 received unexpected message: {:?}", message),
         }
@@ -217,8 +216,7 @@ pub fn terminate(exception: &'static eh_artiq::Exception<'static>, backtrace: &'
 
     {
         let core1_tx = unsafe { KERNEL_CHANNEL_1TO0.as_mut().unwrap() };
-        let errors = unsafe { get_async_errors() };
-        core1_tx.send(Message::KernelException(exception, &backtrace[..cursor], errors));
+        core1_tx.send(Message::KernelException(exception, &backtrace[..cursor]));
     }
     loop {}
 }

src/runtime/src/kernel/mod.rs

@@ -30,8 +30,8 @@ pub enum Message {
     LoadCompleted,
     LoadFailed,
     StartRequest,
-    KernelFinished(u8),
-    KernelException(&'static eh_artiq::Exception<'static>, &'static [usize], u8),
+    KernelFinished,
+    KernelException(&'static eh_artiq::Exception<'static>, &'static [usize]),
     RpcSend { is_async: bool, data: Vec<u8> },
     RpcRecvRequest(*mut ()),
     RpcRecvReply(Result<usize, RPCException>),

src/runtime/src/main.rs

@@ -18,9 +18,12 @@ use libasync::{task, block_async};
 use libsupport_zynq::ram;
 use nb;
 use void::Void;
+use embedded_hal::blocking::delay::DelayMs;
 use libconfig::Config;
 use libcortex_a9::l2c::enable_l2_cache;
 use libboard_artiq::{logger, identifier_read, init_gateware, pl};
+#[cfg(has_si5324)]
+use libboard_artiq::si5324;
 
 mod proto_async;
 mod comms;
@@ -32,7 +35,6 @@ mod rtio;
 #[path = "rtio_acp.rs"]
 mod rtio;
 mod rtio_mgt;
-mod rtio_clocking;
 mod kernel;
 mod moninj;
 mod eh_artiq;
@@ -42,14 +44,66 @@ mod analyzer;
 mod irq;
 mod i2c;
 
-static mut SEEN_ASYNC_ERRORS: u8 = 0;
+fn init_rtio(timer: &mut GlobalTimer, _cfg: &Config) {
+    #[cfg(has_rtio_crg_clock_sel)]
+    let clock_sel =
+        if let Ok(rtioclk) = _cfg.read_str("rtioclk") {
+            match rtioclk.as_ref() {
+                "internal" => {
+                    info!("using internal RTIO clock");
+                    0
+                },
+                "external" => {
+                    info!("using external RTIO clock");
+                    1
+                },
+                other => {
+                    warn!("RTIO clock specification '{}' not recognized", other);
+                    info!("using internal RTIO clock");
+                    0
+                },
+            }
+        } else {
+            info!("using internal RTIO clock (default)");
+            0
+        };
 
-pub unsafe fn get_async_errors() -> u8 {
-    let errors = SEEN_ASYNC_ERRORS;
-    SEEN_ASYNC_ERRORS = 0;
-    errors
+    loop {
+        unsafe {
+            pl::csr::rtio_crg::pll_reset_write(1);
+            #[cfg(has_rtio_crg_clock_sel)]
+            pl::csr::rtio_crg::clock_sel_write(clock_sel);
+            pl::csr::rtio_crg::pll_reset_write(0);
+        }
+        timer.delay_ms(1);
+        let locked = unsafe { pl::csr::rtio_crg::pll_locked_read() != 0 };
+        if locked {
+            info!("RTIO PLL locked");
+            break;
+        } else {
+            warn!("RTIO PLL failed to lock, retrying...");
+            timer.delay_ms(500);
+        }
+    }
+
+    unsafe {
+        pl::csr::rtio_core::reset_phy_write(1);
+    }
 }
 
+#[cfg(has_drtio)]
+fn init_drtio(timer: &mut GlobalTimer)
+{
+    unsafe {
+        pl::csr::drtio_transceiver::stable_clkin_write(1);
+    }
+    timer.delay_ms(2); // wait for CPLL/QPLL lock
+    unsafe {
+        pl::csr::drtio_transceiver::txenable_write(0xffffffffu32 as _);
+    }
+}
+
+
 fn wait_for_async_rtio_error() -> nb::Result<(), Void> {
     unsafe {
         if pl::csr::rtio_core::async_error_read() != 0 {
@@ -77,13 +131,24 @@ async fn report_async_rtio_errors() {
                 error!("RTIO sequence error involving channel {}",
                        pl::csr::rtio_core::sequence_error_channel_read());
             }
-            SEEN_ASYNC_ERRORS = errors;
             pl::csr::rtio_core::async_error_write(errors);
         }
     }
 }
 
-
+#[cfg(has_si5324)]
+// 125MHz output, from crystal, 7 Hz
+const SI5324_SETTINGS: si5324::FrequencySettings
+    = si5324::FrequencySettings {
+    n1_hs  : 10,
+    nc1_ls : 4,
+    n2_hs  : 10,
+    n2_ls  : 19972,
+    n31    : 4565,
+    n32    : 4565,
+    bwsel  : 4,
+    crystal_ref: true
+};
 
 static mut LOG_BUFFER: [u8; 1<<17] = [0; 1<<17];
 
@@ -108,6 +173,9 @@ pub fn main_core0() {
     info!("detected gateware: {}", identifier_read(&mut [0; 64]));
 
     i2c::init();
+    #[cfg(has_si5324)]
+    si5324::setup(unsafe { (&mut i2c::I2C_BUS).as_mut().unwrap() },
+        &SI5324_SETTINGS, si5324::Input::Ckin2, &mut timer).expect("cannot initialize Si5324");
 
     let cfg = match Config::new() {
         Ok(cfg) => cfg,
@@ -117,8 +185,10 @@ pub fn main_core0() {
         }
     };
 
-    rtio_clocking::init(&mut timer, &cfg);
+    #[cfg(has_drtio)]
+    init_drtio(&mut timer);
 
+    init_rtio(&mut timer, &cfg);
     task::spawn(report_async_rtio_errors());
 
     comms::main(timer, cfg);

src/runtime/src/moninj.rs

@@ -1,6 +1,6 @@
 use core::{fmt, cell::RefCell};
 use alloc::{collections::BTreeMap, rc::Rc};
-use log::{debug, info, warn};
+use log::{debug, info, warn, error};
 use void::Void;
 
 use libboard_artiq::drtio_routing;
@@ -60,7 +60,6 @@ mod remote_moninj {
     use super::*;
     use libboard_artiq::drtioaux;
     use crate::rtio_mgt::drtio;
-    use log::error;
 
     pub fn read_probe(aux_mutex: &Rc<Mutex<bool>>, timer: GlobalTimer, linkno: u8, destination: u8, channel: i32, probe: i8) -> i32 {
         let reply = task::block_on(drtio::aux_transact(aux_mutex, linkno, &drtioaux::Packet::MonitorRequest { 
@@ -152,7 +151,7 @@ macro_rules! dispatch {
 macro_rules! dispatch {
     ($timer:ident, $aux_mutex:ident, $routing_table:ident, $channel:expr, $func:ident $(, $param:expr)*) => {{
         let channel = $channel as u16;
-        local_moninj::$func(channel.into(), $($param, )*)
+        local_moninj::$func(channel, $($param, )*)
     }}
 }
 

src/runtime/src/rtio_clocking.rs

@@ -1,238 +0,0 @@
-use log::{info, warn};
-use libboard_zynq::timer::GlobalTimer;
-use embedded_hal::blocking::delay::DelayMs;
-use libconfig::Config;
-use libboard_artiq::pl;
-#[cfg(has_si5324)]
-use libboard_zynq::i2c::I2c;
-#[cfg(has_si5324)]
-use crate::i2c;
-#[cfg(has_si5324)]
-use libboard_artiq::si5324;
-
-#[derive(Debug, PartialEq, Copy, Clone)]
-#[allow(non_camel_case_types)]
-pub enum RtioClock {
-    Default,
-    Int_125,
-    Int_100,
-    Int_150,
-    Ext0_Bypass,
-    Ext0_Synth0_10to125,
-    Ext0_Synth0_100to125,
-    Ext0_Synth0_125to125,
-}
-
-#[allow(unreachable_code)]
-fn get_rtio_clock_cfg(cfg: &Config) -> RtioClock {
-    let mut res = RtioClock::Default;
-    if let Ok(clk) = cfg.read_str("rtio_clock") {
-        res = match clk.as_ref() {
-            "int_125" => RtioClock::Int_125,
-            "int_100" => RtioClock::Int_100,
-            "int_150" => RtioClock::Int_150,
-            "ext0_bypass" => RtioClock::Ext0_Bypass,
-            "ext0_bypass_125" => RtioClock::Ext0_Bypass,
-            "ext0_bypass_100" => RtioClock::Ext0_Bypass,
-            "ext0_synth0_10to125" => RtioClock::Ext0_Synth0_10to125,
-            "ext0_synth0_100to125" => RtioClock::Ext0_Synth0_100to125,
-            "ext0_synth0_125to125" => RtioClock::Ext0_Synth0_125to125,
-            _ => { 
-                warn!("Unrecognised rtio_clock setting. Falling back to default.");
-                RtioClock::Default 
-            }
-        };
-    }
-    else {
-        warn!("error reading configuration. Falling back to default.");
-    }
-    if res == RtioClock::Default {
-        #[cfg(rtio_frequency="100.0")]
-        {
-            warn!("Using default configuration - internal 100MHz RTIO clock.");
-            return RtioClock::Int_100;
-        }
-        #[cfg(rtio_frequency="125.0")]
-        {
-            warn!("Using default configuration - internal 125MHz RTIO clock.");
-            return RtioClock::Int_125;
-        }
-        // anything else
-        {
-            warn!("Using default configuration - internal 125MHz RTIO clock.");
-            return RtioClock::Int_125;
-        }
-    }
-    res
-}
-
-
-fn init_rtio(timer: &mut GlobalTimer, _clk: RtioClock) {
-    #[cfg(has_rtio_crg_clock_sel)]
-    let clock_sel = match _clk {
-        RtioClock::Ext0_Bypass => { 
-            info!("Using bypassed external clock");
-            1
-        },
-        RtioClock::Int_125 => {
-            info!("Using internal RTIO clock");
-            0
-        },
-        _ => {
-            warn!("rtio_clock setting '{:?}' is not supported. Using default internal RTIO clock instead", _clk);
-            0
-        }
-    };
-
-    loop {
-        unsafe {
-            pl::csr::rtio_crg::pll_reset_write(1);
-            #[cfg(has_rtio_crg_clock_sel)]
-            pl::csr::rtio_crg::clock_sel_write(clock_sel);
-            pl::csr::rtio_crg::pll_reset_write(0);
-        }
-        timer.delay_ms(1);
-        let locked = unsafe { pl::csr::rtio_crg::pll_locked_read() != 0 };
-        if locked {
-            info!("RTIO PLL locked");
-            break;
-        } else {
-            warn!("RTIO PLL failed to lock, retrying...");
-            timer.delay_ms(500);
-        }
-    }
-
-    unsafe {
-        pl::csr::rtio_core::reset_phy_write(1);
-    }
-}
-
-#[cfg(has_drtio)]
-fn init_drtio(timer: &mut GlobalTimer)
-{
-    unsafe {
-        pl::csr::drtio_transceiver::stable_clkin_write(1);
-    }
-    timer.delay_ms(2); // wait for CPLL/QPLL lock
-    unsafe {
-        pl::csr::drtio_transceiver::txenable_write(0xffffffffu32 as _);
-    }
-}
-
-#[cfg(has_si5324)]
-fn setup_si5324(i2c: &mut I2c, timer: &mut GlobalTimer, clk: RtioClock) {
-    let si5324_settings = match clk {
-        RtioClock::Ext0_Synth0_10to125 => { // 125 MHz output from 10 MHz CLKINx reference, 504 Hz BW
-            info!("using 10MHz reference to make 125MHz RTIO clock with PLL");
-            si5324::FrequencySettings {
-                n1_hs  : 10,
-                nc1_ls : 4,
-                n2_hs  : 10,
-                n2_ls  : 300,
-                n31    : 6,
-                n32    : 6,
-                bwsel  : 4,
-                crystal_ref: false
-            }
-        },
-        RtioClock::Ext0_Synth0_100to125 => { // 125MHz output, from 100MHz CLKINx reference, 586 Hz loop bandwidth
-            info!("using 10MHz reference to make 125MHz RTIO clock with PLL");
-            si5324::FrequencySettings {
-                n1_hs  : 10,
-                nc1_ls : 4,
-                n2_hs  : 10,
-                n2_ls  : 260,
-                n31    : 52,
-                n32    : 52,
-                bwsel  : 4,
-                crystal_ref: false
-            }
-        },
-        RtioClock::Ext0_Synth0_125to125 => { // 125MHz output, from 125MHz CLKINx reference, 606 Hz loop bandwidth
-            info!("using 10MHz reference to make 125MHz RTIO clock with PLL");
-            si5324::FrequencySettings {
-                n1_hs  : 5,
-                nc1_ls : 8,
-                n2_hs  : 7,
-                n2_ls  : 360,
-                n31    : 63,
-                n32    : 63,
-                bwsel  : 4,
-                crystal_ref: false
-            }
-        },
-        RtioClock::Int_150 => { // 150MHz output, from crystal
-            info!("using internal 150MHz RTIO clock");
-            si5324::FrequencySettings {
-                n1_hs  : 9,
-                nc1_ls : 4,
-                n2_hs  : 10,
-                n2_ls  : 33732,
-                n31    : 7139,
-                n32    : 7139,
-                bwsel  : 3,
-                crystal_ref: true
-            }
-        },
-        RtioClock::Int_100 => { // 100MHz output, from crystal.
-            info!("using internal 100MHz RTIO clock");
-            si5324::FrequencySettings {
-                n1_hs  : 9,
-                nc1_ls : 6,
-                n2_hs  : 10,
-                n2_ls  : 33732,
-                n31    : 7139,
-                n32    : 7139,
-                bwsel  : 3,
-                crystal_ref: true
-            }
-        },
-        RtioClock::Int_125 => { // 125MHz output, from crystal, 7 Hz
-            info!("using internal 125MHz RTIO clock");
-            si5324::FrequencySettings {
-                n1_hs  : 10,
-                nc1_ls : 4,
-                n2_hs  : 10,
-                n2_ls  : 19972,
-                n31    : 4565,
-                n32    : 4565,
-                bwsel  : 4,
-                crystal_ref: true
-            }
-        }
-        _ => { // same setting  as Int_125, but fallback to default
-            warn!("rtio_clock setting '{:?}' is unsupported. Falling back to default internal 125MHz RTIO clock.", clk);
-            si5324::FrequencySettings {
-                n1_hs  : 10,
-                nc1_ls : 4,
-                n2_hs  : 10,
-                n2_ls  : 19972,
-                n31    : 4565,
-                n32    : 4565,
-                bwsel  : 4,
-                crystal_ref: true
-            }
-        }
-    };
-    let si5324_ref_input = si5324::Input::Ckin2;
-    si5324::setup(i2c, &si5324_settings, si5324_ref_input, timer).expect("cannot initialize Si5324");
-}
-
-pub fn init(timer: &mut GlobalTimer, cfg: &Config) {
-
-    let clk = get_rtio_clock_cfg(cfg);
-    #[cfg(has_si5324)]
-    {
-        let i2c = unsafe { (&mut i2c::I2C_BUS).as_mut().unwrap() };
-        let si5324_ext_input = si5324::Input::Ckin2;
-        match clk {
-            RtioClock::Ext0_Bypass => si5324::bypass(i2c, si5324_ext_input, timer).expect("cannot bypass Si5324"),
-            _ => setup_si5324(i2c, timer, clk),
-        }
-    }
-    #[cfg(has_drtio)]
-    init_drtio(timer);
-
-    init_rtio(timer, clk);
-
-}

src/runtime/src/rtio_mgt.rs

@@ -1,6 +1,6 @@
 use core::cell::RefCell;
 use alloc::rc::Rc;
-use libboard_zynq::timer::GlobalTimer;
+use libboard_zynq::{timer::GlobalTimer, time::Milliseconds};
 use libboard_artiq::{pl::csr, drtio_routing};
 use libcortex_a9::mutex::Mutex;
 
@@ -14,7 +14,6 @@ pub mod drtio {
     use log::{warn, error, info};
     use embedded_hal::blocking::delay::DelayMs;
     use libasync::{task, delay};
-    use libboard_zynq::time::Milliseconds;
 
     pub fn startup(aux_mutex: &Rc<Mutex<bool>>,
             routing_table: &Rc<RefCell<drtio_routing::RoutingTable>>,
@@ -25,7 +24,7 @@ pub mod drtio {
         let up_destinations = up_destinations.clone();
         task::spawn(async move {
             let routing_table = routing_table.borrow();
-            link_task(&aux_mutex, &routing_table, &up_destinations, timer).await;
+            link_thread(&aux_mutex, &routing_table, &up_destinations, timer).await;
         });
     }
 
@@ -246,7 +245,7 @@ pub mod drtio {
         }
     }
 
-    pub async fn link_task(aux_mutex: &Rc<Mutex<bool>>,
+    pub async fn link_thread(aux_mutex: &Rc<Mutex<bool>>,
             routing_table: &drtio_routing::RoutingTable,
             up_destinations: &Rc<RefCell<[bool; drtio_routing::DEST_COUNT]>>,
             timer: GlobalTimer) {

src/satman/build.rs

@@ -1,6 +1,21 @@
+use std::env;
+use std::fs::File;
+use std::io::Write;
+use std::path::PathBuf;
+
 extern crate build_zynq;
 
 fn main() {
-    build_zynq::add_linker_script();
+    // Put the linker script somewhere the linker can find it
+    let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap());
+    File::create(out.join("link.x"))
+        .unwrap()
+        .write_all(include_bytes!("link.x"))
+        .unwrap();
+    println!("cargo:rustc-link-search={}", out.display());
+
+    // Only re-run the build script when link.x is changed,
+    // instead of when any part of the source code changes.
+    println!("cargo:rerun-if-changed=link.x");
     build_zynq::cfg();
 }

src/satman/link.x

@@ -0,0 +1,86 @@
+ENTRY(Reset);
+
+MEMORY
+{
+    SDRAM : ORIGIN = 0x00100000, LENGTH = 0x1FF00000
+}
+
+SECTIONS
+{
+    __text_start = .;
+    .text :
+    {
+        KEEP(*(.text.exceptions));
+        *(.text.boot);
+        *(.text .text.*);
+    } > SDRAM
+    __text_end = .;
+
+    __exidx_start = .;
+    .ARM.exidx :
+    {
+        *(.ARM.exidx* .gnu.linkonce.armexidx.*)
+    } > SDRAM
+    __exidx_end = .;
+
+    .ARM.extab :
+    {
+        * (.ARM.extab*)
+    } > SDRAM
+ 
+    .rodata : ALIGN(4)
+    {
+        *(.rodata .rodata.*);
+    } > SDRAM
+ 
+    .data : ALIGN(4)
+    {
+        *(.data .data.*);
+    } > SDRAM
+ 
+    .bss (NOLOAD) : ALIGN(4)
+    {
+        __bss_start = .;
+        *(.bss .bss.*);
+        . = ALIGN(4);
+        __bss_end = .;
+    } > SDRAM
+
+    .heap (NOLOAD) : ALIGN(8)
+    {
+        __heap0_start = .;
+        . += 0x8000000;
+        __heap0_end = .;
+        __heap1_start = .;
+        . += 0x8000000;
+        __heap1_end = .;
+    } > SDRAM
+
+    .stack1 (NOLOAD) : ALIGN(8)
+    {
+        __stack1_end = .;
+        . += 0x1000000;
+        __stack1_start = .;
+    } > SDRAM
+
+    .stack0 (NOLOAD) : ALIGN(8)
+    {
+        __stack0_end = .;
+        . += 0x20000;
+        __stack0_start = .;
+    } > SDRAM
+
+    .irq_stack1 (NOLOAD) : ALIGN(8)
+    {
+        __irq_stack1_end = .;
+        . += 0x100;
+        __irq_stack1_start = .;
+    } > SDRAM
+
+    .irq_stack0 (NOLOAD) : ALIGN(8)
+    {
+        __irq_stack0_end = .;
+        . += 0x100;
+        __irq_stack0_start = .;
+    } > SDRAM
+}

src/satman/satman.ld

@@ -0,0 +1,55 @@
+INCLUDE generated/output_format.ld
+INCLUDE generated/regions.ld
+ENTRY(_reset_handler)
+
+SECTIONS
+{
+    .vectors :
+    {
+        *(.vectors)
+    } > main_ram
+
+    .text :
+    {
+        *(.text .text.*)
+    } > main_ram
+
+    /* https://sourceware.org/bugzilla/show_bug.cgi?id=20475 */
+    .got :
+    {
+        PROVIDE(_GLOBAL_OFFSET_TABLE_ = .);
+        *(.got)
+    } > main_ram
+
+    .got.plt :
+    {
+        *(.got.plt)
+    } > main_ram
+
+    .rodata :
+    {
+        _frodata = .;
+        *(.rodata .rodata.*)
+        _erodata = .;
+    } > main_ram
+
+    .data :
+    {
+        *(.data .data.*)
+    } > main_ram
+
+    .bss ALIGN(4) :
+    {
+        _fbss = .;
+        *(.bss .bss.*)
+        . = ALIGN(4);
+        _ebss = .;
+    } > main_ram
+
+    .stack :
+    {
+        _estack = .;
+        . += 0x10000;
+        _fstack = . - 4;
+    } > main_ram
+}

src/satman/src/jdac_common.rs

@@ -0,0 +1,37 @@
+pub const INIT: u8              = 0x00;
+pub const PRINT_STATUS: u8      = 0x01;
+pub const PRBS: u8              = 0x02;
+pub const STPL: u8              = 0x03;
+
+pub const SYSREF_DELAY_DAC: u8  = 0x10;
+pub const SYSREF_SLIP: u8       = 0x11;
+pub const SYNC: u8              = 0x12;
+
+pub const DDMTD_SYSREF_RAW: u8  = 0x20;
+pub const DDMTD_SYSREF: u8      = 0x21;
+
+
+fn average_2phases(a: i32, b: i32, modulo: i32) -> i32 {
+    let diff = ((a - b + modulo/2 + modulo) % modulo) - modulo/2;
+    return (modulo + b + diff/2) % modulo;
+}
+
+pub fn average_phases(phases: &[i32], modulo: i32) -> i32 {
+    if phases.len() == 1 {
+        panic!("input array length must be a power of 2");
+    } else if phases.len() == 2 {
+        average_2phases(phases[0], phases[1], modulo)
+    } else {
+        let cut = phases.len()/2;
+        average_2phases(
+            average_phases(&phases[..cut], modulo),
+            average_phases(&phases[cut..], modulo),
+            modulo)
+    }
+}
+
+pub const RAW_DDMTD_N_SHIFT: i32 = 6;
+pub const RAW_DDMTD_N: i32 = 1 << RAW_DDMTD_N_SHIFT;
+pub const DDMTD_DITHER_BITS: i32 = 1;
+pub const DDMTD_N_SHIFT: i32 = RAW_DDMTD_N_SHIFT + DDMTD_DITHER_BITS;
+pub const DDMTD_N: i32 = 1 << DDMTD_N_SHIFT;

src/satman/src/main.rs

@@ -311,6 +311,14 @@ fn process_aux_packet(_repeaters: &mut [repeater::Repeater],
                 &drtioaux::Packet::SpiReadReply { succeeded: false, data: 0 })
         }
 
+        drtioaux::Packet::JdacBasicRequest { destination: _destination, dacno: _dacno,
+                                             reqno: _reqno, param: _param } => {
+            forward!(_routing_table, _destination, *_rank, _repeaters, &packet, timer);
+            let (succeeded, retval) = (false, 0);
+            drtioaux::send(0,
+                &drtioaux::Packet::JdacBasicReply { succeeded: succeeded, retval: retval })
+        }
+
         _ => {
             warn!("received unexpected aux packet");
             Ok(())
@@ -398,7 +406,7 @@ fn hardware_tick(ts: &mut u64, timer: &mut GlobalTimer) {
     }
 }
 
-#[cfg(all(has_si5324, rtio_frequency = "125.0"))]
+#[cfg(has_si5324)]
 const SI5324_SETTINGS: si5324::FrequencySettings
     = si5324::FrequencySettings {
     n1_hs  : 5,
@@ -411,19 +419,6 @@ const SI5324_SETTINGS: si5324::FrequencySettings
     crystal_ref: true
 };
 
-#[cfg(all(has_si5324, rtio_frequency = "100.0"))]
-const SI5324_SETTINGS: si5324::FrequencySettings
-    = si5324::FrequencySettings {
-    n1_hs  : 5,
-    nc1_ls : 10,
-    n2_hs  : 10,
-    n2_ls  : 250,
-    n31    : 50,
-    n32    : 50,
-    bwsel  : 4,
-    crystal_ref: true
-};
-
 static mut LOG_BUFFER: [u8; 1<<17] = [0; 1<<17];
 
 #[no_mangle]