add device init scripts and initialize at boot

fast-servo/pyfastservo/common.py

@@ -22,8 +22,8 @@ MAP_SIZE = 0x1000
 MAP_MASK = 0xFFF
 PAGESIZE = 0x1000
 
-LINIEN_OFFSET = 0x0
-# LINIEN_OFFSET = 0x300000
+# LINIEN_OFFSET = 0x0
+LINIEN_OFFSET = 0x300000
 
 # ----------------------------------------------------------------
 # FRONT PANEL LEDS REGISTER ADDRESSES

flake.nix

@@ -210,7 +210,10 @@
             "${patched-not-os}/zynq_image.nix"
           ] ++ pkgs.lib.optionals (board == "fast-servo") [
             ({ config, pkgs, lib, ... }: {
-              environment.systemPackages = [ linien-server ];
+              environment.systemPackages = [
+                linien-server
+                (pkgs.python3.withPackages(ps: [ ps.spidev ps.smbus2 ]))
+              ];
               boot.postBootCommands = lib.mkAfter ''
 
                 # Program the FPGA
@@ -220,6 +223,11 @@
                 mkdir -p /lib/firmware
                 cp ${fast-servo-gateware}/gateware.bin /lib/firmware/
                 echo gateware.bin > /sys/class/fpga_manager/fpga0/firmware
+
+                # Run device init scripts
+                mkdir -p /opt/pyfastservo
+                cp ${./fast-servo/pyfastservo}/* /opt/pyfastservo
+                python3 /opt/pyfastservo/initialize.py
               '';
             })];
           system = "x86_64-linux";
@@ -397,7 +405,7 @@
             BASE=$(realpath $(dirname $0))
 
             qemu-img convert -O qcow2 -f raw -o preallocation=metadata $BASE/sd-image.img $IMGDIR/sd-sparse.qcow2
-            qemu-img create -F qcow2 -f qcow2 -b $IMGDIR/sd-sparse.qcow2 $IMGDIR/sd-overlay.qcow2 1G
+            qemu-img create -F qcow2 -f qcow2 -b $IMGDIR/sd-sparse.qcow2 $IMGDIR/sd-overlay.qcow2 2G
 
             # Some command arguments are based from samples in Xilinx QEMU User Documentation
             # See: https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/821854273/Running+Bare+Metal+Applications+on+QEMU