15 changed files with 112 additions and 361 deletions
--- a/README.md
+++ b/README.md
@ -4,92 +4,60 @@ ARTIQ on Zynq
 How to use
 ----------

-1. [Install ARTIQ](https://m-labs.hk/artiq/manual/installing.html). Get the corresponding version to the ``artiq-zynq`` version you are targeting.
-2. To obtain firmware binaries, use AFWS or build your own; see [the ARTIQ manual](https://m-labs.hk/artiq/manual/building_developing.html) for detailed instructions or skip to "Development" below. ZC706 variants only can also be downloaded from latest successful build on [Hydra](https://nixbld.m-labs.hk/).
-3. Place ``boot.bin`` file at the root ``/`` of a FAT-formatted SD card.
-4. Optionally, create a ``config.txt`` configuration file containing ``key=value`` pairs on each line and place it at the root of the SD card. See below for valid keys. The ``ip``, ``ip6`` and ``mac`` keys can be used to set networking information. If these keys are not found, the firmware will use default values which may or may not be compatible with your network.
-5. Insert the SD card into the board and set the board to boot from the SD card. For ZC706, this is achieved by placing the large DIP switch SW11 into the 00110 position. On Kasli-SoC, place the BOOT MODE switches to SD.
-6. Power up the board. After successful boot the firmware should respond to ping at its IP addresses. Boot output can be observed from UART at 115200bps 8-N-1.
-7. Create and use an ARTIQ device database as usual.
+1. Install the ARTIQ version that corresponds to the artiq-zynq version you are targeting.
+2. To obtain firmware binaries, select the latest successful build on [Hydra](https://nixbld.m-labs.hk/) for the targeted artiq-zynq version, or use AFWS. If using Hydra, search for the job named ``<board>-<variant>-sd`` (for example: ``zc706-nist_clock-sd`` or ``zc706-nist_qc2-sd``).
+3. Place the ``boot.bin`` file, obtained from Hydra's "binary distribution" download link or from AFWS, at the root of a FAT-formatted SD card.
+4. Optionally, create a ``config.txt`` configuration file at the root of the SD card containing ``key=value`` pairs on each line. Use the ``ip``, ``ip6`` and ``mac`` keys to respectively set the IPv4, IPv6 and MAC address of the board. Configuring an IPv6 address is entirely optional. If these keys are not found, the firmware will use default values that may or may not be compatible with your network.
+5. Insert the SD card into the board and set up the board to boot from the SD card. For the ZC706, this is achieved by placing the large DIP switch SW11 in the 00110 position.
+6. Power up the board. After the firmware starts successfully, it should respond to ping at its IP addresses, and boot messages can be observed from its UART at 115200bps.
+7. Create and use an ARTIQ device database as usual, but set ``"target": "cortexa9"`` in the arguments of the core device.

 Configuration
 -------------

-Configuring the device is done using the ``config.txt`` text file at the root of the SD card plus optionally a ``config`` folder. When searching for a configuration key, the firmware first looks for a file named ``/config/[key].bin`` and, if it exists, returns the contents of that file. If not, it looks into ``/config.txt``, which should contain a list of ``key=value`` pairs, one per line. ``config.txt`` should be used for most keys but the ``config`` folder allows for setting configuration values which consist of binary data, such as the startup kernel.
+Configuring the device is done using the ``config.txt`` text file at the root of the SD card, plus the contents of the ``config`` folder. When searching for a configuration key, the firmware first looks for a file named ``/config/[key].bin`` and, if it exists, returns the contents of that file. If not, it looks into ``/config.txt``, which contains a list of ``key=value`` pairs, one per line. The ``config`` folder allows configuration values that consist in binary data, such as the startup kernel.

-The following configuration keys are available among others:
+The following configuration keys are available:

 - ``mac``: Ethernet MAC address.
 - ``ip``: IPv4 address.
 - ``ip6``: IPv6 address.
- ``idle_kernel``: idle kernel in ELF format (as produced by ``artiq_compile``).
- ``startup_kernel``: startup kernel in ELF format (as produced by ``artiq_compile``).
+- ``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``.
+- ``boot``: SD card "boot.bin" file, for replacing the boot firmware/gateware. Write only.

-See [ARTIQ manual](https://m-labs.hk/artiq/manual-beta/core_device.html#configuration-storage) for full list. Configurations can be read/written/removed with ``artiq_coremgmt``. Config erase is not implemented, as it isn't particularly useful.
-
-For convenience, the ``boot`` key can be used with ``artiq_coremgmt`` and a ``boot.bin`` file to replace firmware/gateware in a running system. This key is read-only. When loading ``boot.bin`` onto the SD card directly, place it at the root and not in the ``config`` folder.
+Configurations can be read/written/removed via ``artiq_coremgmt``. Config erase is
+not implemented as it seems not very useful.

 Development instructions
 ------------------------

-ARTIQ on Zynq is packaged using [Nix](https://nixos.org) Flakes. Install Nix 2.8+ and enable flakes by adding ``experimental-features = nix-command flakes`` to ``nix.conf`` (e.g. ``~/.config/nix/nix.conf``).
+ARTIQ on Zynq is packaged using the [Nix](https://nixos.org) Flakes system. Install Nix 2.8+ and enable flakes by adding ``experimental-features = nix-command flakes`` to ``nix.conf`` (e.g. ``~/.config/nix/nix.conf``).

-**Pure build with Nix:**
+Pure build with Nix and execution on a remote JTAG server:

 ```shell
-nix build .#zc706-nist_clock-jtag  # or zc706-nist_qc2-jtag or zc706-nist_clock-sd or etc
+nix build .#zc706-nist_clock-jtag  # or zc706-nist_qc2-jtag or zc706-nist_clock_satellite-jtag etc.
+./remote_run.sh
 ```

-Run ``nix flake show`` to see all valid build targets. Targets suffixed with ``-jtag`` produce separate firmware and gateware files, intended for use in booting via JTAG server/Ethernet, e.g. ``./remote_run.sh -i`` with a remote JTAG server. Targets suffixed with ``-sd`` will produce ``boot.bin`` file suitable for SD card boot. ``-firmware`` and ``-gateware`` respectively build firmware and gateware only.
-
-The Kasli-SoC target requires a system description file as input. See ARTIQ manual for exact instructions or use incremental build.
-
-**Impure incremental build:**
-
-For boards with fixed variants, i.e. ZC706, etc. :
+Impure incremental build and execution on a remote JTAG server:

 ```shell
 nix develop
 cd src
-gateware/<board>.py -g ../build/gateware -V <variant> # gateware
-make GWARGS="-V <variant>" <runtime/satman>    # firmware
-```
-
-For boards with system descriptions, i.e. Kasli-SoC, etc. :
-
-```shell
-nix develop
-cd src
-gateware/<board>.py -g ../build/gateware <description.json> # gateware
-make TARGET=<board> GWARGS="path/to/description.json" <runtime/satman> # firmware
-```
-
-``szl.elf`` can be obtained with:
-
-```shell
-nix build git+https://git.m-labs.hk/m-labs/zynq-rs#<board>-szl
-```
-
-To generate ``boot.bin`` use ``mkbootimage``, e.g.:
-
-```shell
-echo "the_ROM_image:
-    {
-        [bootloader]result/szl.elf
-        gateware/top.bit
-        firmware/armv7-none-eabihf/release/<runtime/satman>
-    }
-    EOF" >> boot.bif
-mkbootimage boot.bif boot.bin
+gateware/zc706.py -g ../build/gateware -V <variant> # build gateware
+make GWARGS="-V <variant>" <runtime/satman>    # build firmware
+cd ..
+./remote_run.sh -i
 ```

 Notes:

 - 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 by JTAG, use the ``local_run.sh`` script.
- A known Xilinx hardware bug prevents repeatedly loading the bootloader over JTAG without a POR reset. If booting over JTAG, install a jumper on ``PS_POR_B`` and use the POR reset script [here](https://git.m-labs.hk/M-Labs/zynq-rs/src/branch/master/kasli_soc_por.py).
+- If the board is connected to the local machine, use the ``local_run.sh`` script.

 Pre-Commit Hooks
 ----------------
--- a/examples/ebaz4205/device_db.py
+++ b/examples/ebaz4205/device_db.py
@ -1,78 +0,0 @@
-core_addr = "192.168.1.57"
-
-device_db = {
-    "core": {
-        "type": "local",
-        "module": "artiq.coredevice.core",
-        "class": "Core",
-        "arguments": {
-            "host": core_addr,
-            "ref_period": 1e-9,
-            "target": "cortexa9",
-        },
-    },
-    "core_log": {
-        "type": "controller",
-        "host": "::1",
-        "port": 1068,
-        "command": "aqctl_corelog -p {port} --bind {bind} " + core_addr,
-    },
-    "core_moninj": {
-        "type": "controller",
-        "host": "::1",
-        "port_proxy": 1383,
-        "port": 1384,
-        "command": "aqctl_moninj_proxy --port-proxy {port_proxy} --port-control {port} --bind {bind} "
-        + core_addr,
-    },
-    "core_analyzer": {
-        "type": "controller",
-        "host": "::1",
-        "port_proxy": 1385,
-        "port": 1386,
-        "command": "aqctl_coreanalyzer_proxy --port-proxy {port_proxy} --port-control {port} --bind {bind} "
-        + core_addr,
-    },
-    "core_cache": {
-        "type": "local",
-        "module": "artiq.coredevice.cache",
-        "class": "CoreCache",
-    },
-    "core_dma": {"type": "local", "module": "artiq.coredevice.dma", "class": "CoreDMA"},
-    "led0": {
-        "type": "local",
-        "module": "artiq.coredevice.ttl",
-        "class": "TTLOut",
-        "arguments": {"channel": 0},
-    },
-    "led1": {
-        "type": "local",
-        "module": "artiq.coredevice.ttl",
-        "class": "TTLOut",
-        "arguments": {"channel": 1},
-    },
-}
-
-# TTLs starting at RTIO channel 2, ending at RTIO channel 15
-for i in range(2, 16):
-    device_db["ttl" + str(i)] = {
-        "type": "local",
-        "module": "artiq.coredevice.ttl",
-        "class": "TTLInOut",
-        "arguments": {"channel": i},
-    }
-
-device_db.update(
-    spi0={
-        "type": "local",
-        "module": "artiq.coredevice.spi2",
-        "class": "SPIMaster",
-        "arguments": {"channel": 16},
-    },
-    dds0={
-        "type": "local",
-        "module": "artiq.coredevice.ad9834",
-        "class": "AD9834",
-        "arguments": {"spi_device": "spi0"},
-    },
-)
--- a/flake.lock
+++ b/flake.lock
@ -11,11 +11,11 @@
        "src-pythonparser": "src-pythonparser"
      },
      "locked": {
-        "lastModified": 1731734344,
-        "narHash": "sha256-2vLRo9D5wDs5FArpc2pOfuKFrhnqIKjtZos88VJahhc=",
+        "lastModified": 1727765117,
+        "narHash": "sha256-P4PgnsXNL4kXjSAhRpXzkq17j8bEaJAqNLSH2Vt+DY0=",
        "ref": "refs/heads/master",
-        "rev": "27d54cb8f3a394b4f4adcbb3c2c9160c5bf3df47",
-        "revCount": 9049,
+        "rev": "333623e24bdec00783bc89c1e8b6b49a74bc9e1c",
+        "revCount": 9020,
        "type": "git",
        "url": "https://github.com/m-labs/artiq.git"
      },
@ -68,13 +68,45 @@
        "type": "github"
      }
    },
+    "mozilla-overlay": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1704373101,
+        "narHash": "sha256-+gi59LRWRQmwROrmE1E2b3mtocwueCQqZ60CwLG+gbg=",
+        "owner": "mozilla",
+        "repo": "nixpkgs-mozilla",
+        "rev": "9b11a87c0cc54e308fa83aac5b4ee1816d5418a2",
+        "type": "github"
+      },
+      "original": {
+        "owner": "mozilla",
+        "repo": "nixpkgs-mozilla",
+        "type": "github"
+      }
+    },
+    "mozilla-overlay_2": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1704373101,
+        "narHash": "sha256-+gi59LRWRQmwROrmE1E2b3mtocwueCQqZ60CwLG+gbg=",
+        "owner": "mozilla",
+        "repo": "nixpkgs-mozilla",
+        "rev": "9b11a87c0cc54e308fa83aac5b4ee1816d5418a2",
+        "type": "github"
+      },
+      "original": {
+        "owner": "mozilla",
+        "repo": "nixpkgs-mozilla",
+        "type": "github"
+      }
+    },
    "nixpkgs": {
      "locked": {
-        "lastModified": 1731319897,
-        "narHash": "sha256-PbABj4tnbWFMfBp6OcUK5iGy1QY+/Z96ZcLpooIbuEI=",
+        "lastModified": 1727348695,
+        "narHash": "sha256-J+PeFKSDV+pHL7ukkfpVzCOO7mBSrrpJ3svwBFABbhI=",
        "owner": "NixOS",
        "repo": "nixpkgs",
-        "rev": "dc460ec76cbff0e66e269457d7b728432263166c",
+        "rev": "1925c603f17fc89f4c8f6bf6f631a802ad85d784",
        "type": "github"
      },
      "original": {
@ -87,6 +119,7 @@
    "root": {
      "inputs": {
        "artiq": "artiq",
+        "mozilla-overlay": "mozilla-overlay",
        "zynq-rs": "zynq-rs"
      }
    },
@ -112,28 +145,6 @@
        "type": "github"
      }
    },
-    "rust-overlay_2": {
-      "inputs": {
-        "nixpkgs": [
-          "zynq-rs",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1719454714,
-        "narHash": "sha256-MojqG0lyUINkEk0b3kM2drsU5vyaF8DFZe/FAlZVOGs=",
-        "owner": "oxalica",
-        "repo": "rust-overlay",
-        "rev": "d1c527659cf076ecc4b96a91c702d080b213801e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "oxalica",
-        "ref": "snapshot/2024-08-01",
-        "repo": "rust-overlay",
-        "type": "github"
-      }
-    },
    "sipyco": {
      "inputs": {
        "nixpkgs": [
@ -142,11 +153,11 @@
        ]
      },
      "locked": {
-        "lastModified": 1728371104,
-        "narHash": "sha256-PPnAyDedUQ7Og/Cby9x5OT9wMkNGTP8GS53V6N/dk4w=",
+        "lastModified": 1724921939,
+        "narHash": "sha256-/S5iip1LHLiCP2VY7PwClDteP9ZMRZvzzKR1LZuV3fs=",
        "owner": "m-labs",
        "repo": "sipyco",
-        "rev": "094a6cd63ffa980ef63698920170e50dc9ba77fd",
+        "rev": "32ddd78ff3641b75054793ea0d5681c951766754",
        "type": "github"
      },
      "original": {
@ -174,11 +185,11 @@
    "src-misoc": {
      "flake": false,
      "locked": {
-        "lastModified": 1729234629,
-        "narHash": "sha256-TLsTCXV5AC2xh+bS7EhBVBKqdqIU3eKrnlWcFF9LtAM=",
+        "lastModified": 1715647536,
+        "narHash": "sha256-q+USDcaKHABwW56Jzq8u94iGPWlyLXMyVt0j/Gyg+IE=",
        "ref": "refs/heads/master",
-        "rev": "6085a312bca26adeca6584e37d08c8ba2e1d6e38",
-        "revCount": 2460,
+        "rev": "fea9de558c730bc394a5936094ae95bb9d6fa726",
+        "revCount": 2455,
        "submodules": true,
        "type": "git",
        "url": "https://github.com/m-labs/misoc.git"
@ -222,18 +233,18 @@
    },
    "zynq-rs": {
      "inputs": {
+        "mozilla-overlay": "mozilla-overlay_2",
        "nixpkgs": [
          "artiq",
          "nixpkgs"
-        ],
-        "rust-overlay": "rust-overlay_2"
+        ]
      },
      "locked": {
-        "lastModified": 1731749494,
-        "narHash": "sha256-WGigAhvVCGN5YZ1dHPyvoqAh47W1Gtph036O1aKFlLE=",
+        "lastModified": 1728110308,
+        "narHash": "sha256-MAoFbcDgr+ZjptFCWfthK+tTnR1NcfuO6tvYhNM2Pwo=",
        "ref": "refs/heads/master",
-        "rev": "12975de2e110d7948bf47b768559f727d0abc8fc",
-        "revCount": 655,
+        "rev": "cc20478d91e30e1448a4304df7003caed2981b71",
+        "revCount": 651,
        "type": "git",
        "url": "https://git.m-labs.hk/m-labs/zynq-rs"
      },
--- a/flake.nix
+++ b/flake.nix
@ -2,12 +2,13 @@
  description = "ARTIQ port to the Zynq-7000 platform";

  inputs.artiq.url = git+https://github.com/m-labs/artiq.git;
+  inputs.mozilla-overlay = { url = github:mozilla/nixpkgs-mozilla; flake = false; };
  inputs.zynq-rs.url = git+https://git.m-labs.hk/m-labs/zynq-rs;
  inputs.zynq-rs.inputs.nixpkgs.follows = "artiq/nixpkgs";

-  outputs = { self, zynq-rs, artiq }:
+  outputs = { self, mozilla-overlay, zynq-rs, artiq }:
  let
-    pkgs = import artiq.inputs.nixpkgs { system = "x86_64-linux"; overlays = [ (import zynq-rs.inputs.rust-overlay) ]; };
+    pkgs = import artiq.inputs.nixpkgs { system = "x86_64-linux"; overlays = [ (import mozilla-overlay) ]; };
    zynqpkgs = zynq-rs.packages.x86_64-linux;
    artiqpkgs = artiq.packages.x86_64-linux;
    llvmPackages_11 = zynq-rs.llvmPackages_11;
--- a/src/gateware/ebaz4205.py
+++ b/src/gateware/ebaz4205.py
@ -1,19 +1,23 @@
 #!/usr/bin/env python

 import argparse
+from operator import itemgetter

-import analyzer
-import dma
-from artiq.gateware import rtio
-from artiq.gateware.rtio.phy import spi2, ttl_simple
-from artiq.gateware.rtio.xilinx_clocking import fix_serdes_timing_path
-from config import write_csr_file, write_mem_file, write_rustc_cfg_file
 from migen import *
-from migen.build.generic_platform import IOStandard, Misc, Pins, Subsignal
 from migen.build.platforms import ebaz4205
+from migen.build.generic_platform import Pins, Subsignal, IOStandard, Misc
 from migen_axi.integration.soc_core import SoCCore
 from misoc.interconnect.csr import *

+from artiq.gateware import rtio
+from artiq.gateware.rtio.phy import ttl_simple
+from artiq.gateware.rtio.xilinx_clocking import fix_serdes_timing_path
+
+import dma
+import analyzer
+
+from config import write_csr_file, write_mem_file, write_rustc_cfg_file
+
 _ps = [
    (
        "ps",
@ -79,28 +83,6 @@ _i2c = [
    )
 ]

-_spi = [
-    (
-        "spi",
-        0,
-        Subsignal("clk", Pins("V20")),
-        Subsignal("mosi", Pins("U20")),
-        Subsignal("cs_n", Pins("P19")),
-        IOStandard("LVCMOS33"),
-    )
-]
-
-
-# Connector DATA1
-def _create_ttl():
-    _ttl = []
-
-    for idx, elem in enumerate([x for x in range(5, 21) if x not in (10, 12)]):
-        _ttl.append(
-            ("ttl", idx, Pins("DATA1:DATA1-{}".format(elem)), IOStandard("LVCMOS33")),
-        )
-    return _ttl
-

 class EBAZ4205(SoCCore):
    def __init__(self, rtio_clk=125e6, acpki=False):
@ -115,8 +97,6 @@ class EBAZ4205(SoCCore):
        platform.add_extension(_ps)
        platform.add_extension(_ddr)
        platform.add_extension(_i2c)
-        platform.add_extension(_spi)
-        platform.add_extension(_create_ttl())

        gmii = platform.request("gmii")
        platform.add_period_constraint(gmii.rx_clk, 10)
@ -191,18 +171,6 @@ class EBAZ4205(SoCCore):
            phy = ttl_simple.Output(user_led)
            self.submodules += phy
            self.rtio_channels.append(rtio.Channel.from_phy(phy))
-
-        for i in range(14):
-            print("TTL at RTIO channel 0x{:06x}".format(len(self.rtio_channels)))
-            ttl = self.platform.request("ttl", i)
-            phy = ttl_simple.InOut(ttl)
-            self.submodules += phy
-            self.rtio_channels.append(rtio.Channel.from_phy(phy))
-
-        print("SPI at RTIO channel 0x{:06x}".format(len(self.rtio_channels)))
-        spi_phy = spi2.SPIMaster(platform.request("spi"))
-        self.submodules += spi_phy
-        self.rtio_channels.append(rtio.Channel.from_phy(spi_phy, ififo_depth=4))
        self.config["RTIO_LOG_CHANNEL"] = len(self.rtio_channels)
        self.rtio_channels.append(rtio.LogChannel())

--- a/src/libboard_artiq/src/drtio_eem.rs
+++ b/src/libboard_artiq/src/drtio_eem.rs
@ -185,24 +185,6 @@ unsafe fn align_comma(timer: &mut GlobalTimer) {
    }
 }

-pub unsafe fn align_wordslip(timer: &mut GlobalTimer, trx_no: u8) -> bool {
-    pl::csr::eem_transceiver::transceiver_sel_write(trx_no);
-
-    for slip in 0..=1 {
-        pl::csr::eem_transceiver::wordslip_write(slip as u8);
-        timer.delay_us(1);
-        pl::csr::eem_transceiver::comma_align_reset_write(1);
-        timer.delay_us(100);
-
-        if pl::csr::eem_transceiver::comma_read() == 1 {
-            debug!("comma alignment completed with {} wordslip", slip);
-            return true;
-        }
-    }
-
-    false
-}
-
 pub fn init(timer: &mut GlobalTimer, cfg: &Config) {
    for trx_no in 0..pl::csr::CONFIG_EEM_DRTIO_COUNT {
        unsafe {
@ -240,6 +222,7 @@ pub fn init(timer: &mut GlobalTimer, cfg: &Config) {

        unsafe {
            align_comma(timer);
+            pl::csr::eem_transceiver::rx_ready_write(1);
        }
    }
 }
--- a/src/libboard_artiq/src/drtioaux_proto.rs
+++ b/src/libboard_artiq/src/drtioaux_proto.rs
@ -255,7 +255,6 @@ pub enum Packet {
        destination: u8,
        id: u32,
        run: bool,
-        timestamp: u64,
    },
    SubkernelLoadRunReply {
        destination: u8,
@ -515,7 +514,6 @@ impl Packet {
                destination: reader.read_u8()?,
                id: reader.read_u32()?,
                run: reader.read_bool()?,
-                timestamp: reader.read_u64()?,
            },
            0xc5 => Packet::SubkernelLoadRunReply {
                destination: reader.read_u8()?,
@ -879,14 +877,12 @@ impl Packet {
                destination,
                id,
                run,
-                timestamp,
            } => {
                writer.write_u8(0xc4)?;
                writer.write_u8(source)?;
                writer.write_u8(destination)?;
                writer.write_u32(id)?;
                writer.write_bool(run)?;
-                writer.write_u64(timestamp)?;
            }
            Packet::SubkernelLoadRunReply { destination, succeeded } => {
                writer.write_u8(0xc5)?;
--- a/src/libksupport/src/kernel/mod.rs
+++ b/src/libksupport/src/kernel/mod.rs
@ -81,7 +81,6 @@ pub enum Message {
        id: u32,
        destination: u8,
        run: bool,
-        timestamp: u64,
    },
    #[cfg(has_drtio)]
    SubkernelLoadRunReply {
--- a/src/libksupport/src/kernel/subkernel.rs
+++ b/src/libksupport/src/kernel/subkernel.rs
@ -3,7 +3,7 @@ use alloc::vec::Vec;
 use cslice::CSlice;

 use super::{Message, SubkernelStatus, KERNEL_CHANNEL_0TO1, KERNEL_CHANNEL_1TO0};
-use crate::{artiq_raise, eh_artiq, rpc::send_args, rtio::now_mu};
+use crate::{artiq_raise, eh_artiq, rpc::send_args};

 pub extern "C" fn load_run(id: u32, destination: u8, run: bool) {
    unsafe {
@ -14,7 +14,6 @@ pub extern "C" fn load_run(id: u32, destination: u8, run: bool) {
                id: id,
                destination: destination,
                run: run,
-                timestamp: now_mu() as u64,
            });
    }
    match unsafe { KERNEL_CHANNEL_0TO1.as_mut().unwrap() }.recv() {
--- a/src/runtime/src/comms.rs
+++ b/src/runtime/src/comms.rs
@ -405,9 +405,8 @@ async fn handle_run_kernel(
                id,
                destination: _,
                run,
-                timestamp,
            } => {
-                let succeeded = match subkernel::load(aux_mutex, routing_table, timer, id, run, timestamp).await {
+                let succeeded = match subkernel::load(aux_mutex, routing_table, timer, id, run).await {
                    Ok(()) => true,
                    Err(e) => {
                        error!("Error loading subkernel: {:?}", e);
--- a/src/runtime/src/rtio_clocking.rs
+++ b/src/runtime/src/rtio_clocking.rs
@ -12,9 +12,9 @@ use libboard_artiq::si549;
 use libboard_zynq::i2c::I2c;
 use libboard_zynq::timer::GlobalTimer;
 use libconfig::Config;
-use log::{info, warn};
-#[cfg(feature = "target_ebaz4205")]
-use {libboard_zynq::slcr, libregister::RegisterRW};
+#[cfg(not(feature = "target_ebaz4205"))]
+use log::info;
+use log::warn;

 #[derive(Debug, PartialEq, Copy, Clone)]
 #[allow(non_camel_case_types)]
@ -410,38 +410,6 @@ fn get_si549_setting(clk: RtioClock) -> si549::FrequencySetting {
    }
 }

-#[cfg(feature = "target_ebaz4205")]
-fn set_fclk0_freq(clk: RtioClock, cfg: &Config) {
-    let io_pll_freq: u32 = 1_000_000_000; // Hardcoded in zynq-rs
-    let mut target_freq = 0;
-    let mut divisor0 = 1u8;
-
-    match clk {
-        RtioClock::Int_100 => {
-            target_freq = 100_000_000;
-            divisor0 = 10;
-        }
-        RtioClock::Int_125 => {
-            target_freq = 125_000_000;
-            divisor0 = 8;
-        }
-        _ => {
-            warn!("Unsupported RTIO Clock: '{:?}'", clk);
-            return;
-        }
-    }
-
-    slcr::RegisterBlock::unlocked(|slcr| {
-        slcr.fpga0_clk_ctrl.modify(|_, w| w.divisor0(divisor0));
-    });
-
-    info!(
-        "Set FCLK0 to {:.2} MHz (target: {} MHz).",
-        io_pll_freq as f64 / divisor0 as f64,
-        target_freq / 1_000_000
-    );
-}
-
 pub fn init(timer: &mut GlobalTimer, cfg: &Config) {
    let clk = get_rtio_clock_cfg(cfg);
    #[cfg(has_si5324)]
@ -468,16 +436,6 @@ pub fn init(timer: &mut GlobalTimer, cfg: &Config) {
    #[cfg(not(any(has_drtio, feature = "target_ebaz4205")))]
    init_rtio(timer);

-    #[cfg(feature = "target_ebaz4205")]
-    {
-        match clk {
-            RtioClock::Int_100 | RtioClock::Int_125 => {
-                set_fclk0_freq(clk, cfg);
-            }
-            _ => {} // Not set for external clocks
-        }
-    }
-
    #[cfg(all(has_si549, has_wrpll))]
    {
        // SYS CLK switch will reset CSRs that are used by WRPLL
--- a/src/runtime/src/rtio_mgt.rs
+++ b/src/runtime/src/rtio_mgt.rs
@ -13,13 +13,9 @@ pub mod drtio {
    use core::fmt;

    use embedded_hal::blocking::delay::DelayMs;
-    #[cfg(has_drtio_eem)]
-    use embedded_hal::blocking::delay::DelayUs;
    use ksupport::{resolve_channel_name, ASYNC_ERROR_BUSY, ASYNC_ERROR_COLLISION, ASYNC_ERROR_SEQUENCE_ERROR,
                   SEEN_ASYNC_ERRORS};
    use libasync::{delay, task};
-    #[cfg(has_drtio_eem)]
-    use libboard_artiq::drtio_eem;
    use libboard_artiq::{drtioaux::Error as DrtioError,
                         drtioaux_async,
                         drtioaux_async::Packet,
@ -30,10 +26,6 @@ pub mod drtio {
    use super::*;
    use crate::{analyzer::remote_analyzer::RemoteBuffer, rtio_dma::remote_dma, subkernel};

-    #[cfg(has_drtio_eem)]
-    const DRTIO_EEM_LINKNOS: core::ops::Range<usize> =
-        (csr::DRTIO.len() - csr::CONFIG_EEM_DRTIO_COUNT as usize)..csr::DRTIO.len();
-
    #[derive(Debug, PartialEq, Eq, Clone, Copy)]
    pub enum Error {
        Timeout,
@ -84,18 +76,8 @@ pub mod drtio {
        });
    }

-    async fn link_rx_up(linkno: u8, timer: &mut GlobalTimer) -> bool {
+    async fn link_rx_up(linkno: u8) -> bool {
        let linkno = linkno as usize;
-        #[cfg(has_drtio_eem)]
-        if DRTIO_EEM_LINKNOS.contains(&linkno) {
-            let eem_trx_no = linkno - DRTIO_EEM_LINKNOS.start;
-            unsafe {
-                csr::eem_transceiver::transceiver_sel_write(eem_trx_no as u8);
-                csr::eem_transceiver::comma_align_reset_write(1);
-            }
-            timer.delay_us(100);
-            return unsafe { csr::eem_transceiver::comma_read() == 1 };
-        }
        unsafe { (csr::DRTIO[linkno].rx_up_read)() == 1 }
    }

@ -170,8 +152,8 @@ pub mod drtio {
        }
    }

-    async fn recv_aux_timeout(linkno: u8, timeout: u64, mut timer: GlobalTimer) -> Result<Packet, Error> {
-        if !link_rx_up(linkno, &mut timer).await {
+    async fn recv_aux_timeout(linkno: u8, timeout: u64, timer: GlobalTimer) -> Result<Packet, Error> {
+        if !link_rx_up(linkno).await {
            return Err(Error::LinkDown);
        }
        match drtioaux_async::recv_timeout(linkno, Some(timeout), timer).await {
@ -186,9 +168,9 @@ pub mod drtio {
        linkno: u8,
        routing_table: &RoutingTable,
        request: &Packet,
-        mut timer: GlobalTimer,
+        timer: GlobalTimer,
    ) -> Result<Packet, Error> {
-        if !link_rx_up(linkno, &mut timer).await {
+        if !link_rx_up(linkno).await {
            return Err(Error::LinkDown);
        }
        let _lock = aux_mutex.async_lock().await;
@ -212,11 +194,11 @@ pub mod drtio {
        aux_mutex: &Rc<Mutex<bool>>,
        linkno: u8,
        routing_table: &RoutingTable,
-        mut timer: GlobalTimer,
+        timer: GlobalTimer,
    ) -> u32 {
        let mut count = 0;
        loop {
-            if !link_rx_up(linkno, &mut timer).await {
+            if !link_rx_up(linkno).await {
                return 0;
            }
            count += 1;
@ -480,7 +462,7 @@ pub mod drtio {
        aux_mutex: &Rc<Mutex<bool>>,
        routing_table: &RoutingTable,
        up_destinations: &Rc<RefCell<[bool; drtio_routing::DEST_COUNT]>>,
-        mut timer: GlobalTimer,
+        timer: GlobalTimer,
    ) {
        let mut up_links = [false; csr::DRTIO.len()];
        loop {
@ -488,35 +470,16 @@ pub mod drtio {
                let linkno = linkno as u8;
                if up_links[linkno as usize] {
                    /* link was previously up */
-                    if link_rx_up(linkno, &mut timer).await {
+                    if link_rx_up(linkno).await {
                        process_unsolicited_aux(aux_mutex, linkno, routing_table).await;
                        process_local_errors(linkno).await;
                    } else {
                        info!("[LINK#{}] link is down", linkno);
                        up_links[linkno as usize] = false;
-
-                        #[cfg(has_drtio_eem)]
-                        if DRTIO_EEM_LINKNOS.contains(&(linkno as usize)) {
-                            unsafe {
-                                csr::eem_transceiver::rx_ready_write(0);
-                            }
-                            while !matches!(drtioaux_async::recv(linkno).await, Ok(None)) {}
-                        }
                    }
                } else {
                    /* link was previously down */
-                    #[cfg(has_drtio_eem)]
-                    if DRTIO_EEM_LINKNOS.contains(&(linkno as usize)) {
-                        let eem_trx_no = linkno - DRTIO_EEM_LINKNOS.start as u8;
-                        if !unsafe { drtio_eem::align_wordslip(&mut timer, eem_trx_no) } {
-                            continue;
-                        }
-                        unsafe {
-                            csr::eem_transceiver::rx_ready_write(1);
-                        }
-                    }
-
-                    if link_rx_up(linkno, &mut timer).await {
+                    if link_rx_up(linkno).await {
                        info!("[LINK#{}] link RX became up, pinging", linkno);
                        let ping_count = ping_remote(aux_mutex, linkno, routing_table, timer).await;
                        if ping_count > 0 {
@ -560,7 +523,7 @@ pub mod drtio {

        for linkno in 0..csr::DRTIO.len() {
            let linkno = linkno as u8;
-            if task::block_on(link_rx_up(linkno, &mut timer)) {
+            if task::block_on(link_rx_up(linkno)) {
                let reply = task::block_on(aux_transact(
                    &aux_mutex,
                    linkno,
@ -829,7 +792,6 @@ pub mod drtio {
        id: u32,
        destination: u8,
        run: bool,
-        timestamp: u64,
    ) -> Result<(), Error> {
        let linkno = routing_table.0[destination as usize][0] - 1;
        let reply = aux_transact(
@ -841,7 +803,6 @@ pub mod drtio {
                source: 0,
                destination: destination,
                run: run,
-                timestamp,
            },
            timer,
        )
--- a/src/runtime/src/subkernel.rs
+++ b/src/runtime/src/subkernel.rs
@ -100,22 +100,12 @@ pub async fn load(
    timer: GlobalTimer,
    id: u32,
    run: bool,
-    timestamp: u64,
 ) -> Result<(), Error> {
    if let Some(subkernel) = SUBKERNELS.async_lock().await.get_mut(&id) {
        if subkernel.state != SubkernelState::Uploaded {
            return Err(Error::IncorrectState);
        }
-        drtio::subkernel_load(
-            aux_mutex,
-            routing_table,
-            timer,
-            id,
-            subkernel.destination,
-            run,
-            timestamp,
-        )
-        .await?;
+        drtio::subkernel_load(aux_mutex, routing_table, timer, id, subkernel.destination, run).await?;
        if run {
            subkernel.state = SubkernelState::Running;
        }
--- a/src/satman/src/main.rs
+++ b/src/satman/src/main.rs
@ -826,7 +826,6 @@ fn process_aux_packet(
            destination: _destination,
            id,
            run,
-            timestamp,
        } => {
            forward!(
                router,
@ -845,7 +844,7 @@ fn process_aux_packet(
                    // cannot run kernel while DDMA is running
                    succeeded = false;
                } else {
-                    succeeded |= kernel_manager.run(source, id, timestamp).is_ok();
+                    succeeded |= kernel_manager.run(source, id).is_ok();
                }
            }
            router.send(
--- a/src/satman/src/subkernel.rs
+++ b/src/satman/src/subkernel.rs
@ -8,7 +8,7 @@ use core_io::{Error as IoError, Write};
 use cslice::AsCSlice;
 use dma::{Error as DmaError, Manager as DmaManager};
 use io::{Cursor, ProtoWrite};
-use ksupport::{eh_artiq, kernel, rpc, rtio};
+use ksupport::{eh_artiq, kernel, rpc};
 use libboard_artiq::{drtio_routing::RoutingTable,
                     drtioaux,
                     drtioaux_proto::{PayloadStatus, MASTER_PAYLOAD_MAX_SIZE},
@ -349,7 +349,7 @@ impl<'a> Manager<'_> {
        }
    }

-    pub fn run(&mut self, source: u8, id: u32, timestamp: u64) -> Result<(), Error> {
+    pub fn run(&mut self, source: u8, id: u32) -> Result<(), Error> {
        if self.session.kernel_state != KernelState::Loaded || self.session.id != id {
            self.load(id)?;
        }
@ -359,7 +359,6 @@ impl<'a> Manager<'_> {
            csr::cri_con::selected_write(2);
        }

-        rtio::at_mu(timestamp as i64);
        self.control.tx.send(kernel::Message::StartRequest);
        Ok(())
    }
@ -813,7 +812,6 @@ impl<'a> Manager<'_> {
                id,
                destination: sk_destination,
                run,
-                timestamp,
            } => {
                self.session.kernel_state = KernelState::SubkernelAwaitLoad;
                router.route(
@ -822,7 +820,6 @@ impl<'a> Manager<'_> {
                        destination: sk_destination,
                        id: id,
                        run: run,
-                        timestamp,
                    },
                    routing_table,
                    rank,