From ee53143215d82acfe159009b5745795828fddb5b Mon Sep 17 00:00:00 2001
From: Travis Staton <tstaton@mercury.com>
Date: Sun, 3 Nov 2024 12:06:15 -0500
Subject: [PATCH] add initrd

---
 rpi/default.nix      | 11 +++++++++++
 sd-image/default.nix |  2 ++
 2 files changed, 13 insertions(+)

diff --git a/rpi/default.nix b/rpi/default.nix
index 57b93a1..8a15a9b 100644
--- a/rpi/default.nix
+++ b/rpi/default.nix
@@ -6,6 +6,7 @@ let
   version = cfg.kernel-version;
   board = cfg.board;
   kernel = pkgs.rpi-kernels."${version}"."${board}";
+  initrd = "${config.system.build.initialRamdisk}/${config.system.boot.loader.initrdFile}";
 in
 {
   imports = [ ./config.nix ./i2c.nix ];
@@ -130,6 +131,8 @@ in
                   touch "$STATE_DIRECTORY/kernel-migration-in-progress"
                   cp "$KERNEL" "$TMPFILE"
                   mv -T "$TMPFILE" "$TARGET_FIRMWARE_DIR/kernel.img"
+                  cp "${initrd}" "$TMPFILE"
+                  mv -T "$TMPFILE" "$TARGET_FIRMWARE_DIR/initrd"
                   echo "${
                     builtins.toString kernel
                   }" > "$STATE_DIRECTORY/kernel-version"
@@ -243,6 +246,14 @@ in
             enable = true;
             value = if cfg.uboot.enable then "u-boot-rpi-arm64.bin" else "kernel.img";
           };
+          ramfsfile = {
+            enable = !cfg.uboot.enable;
+            value = "initrd";
+          };
+          ramfsaddr = {
+            enable = !cfg.uboot.enable;
+            value = -1;
+          };
           arm_64bit = {
             enable = true;
             value = true;
diff --git a/sd-image/default.nix b/sd-image/default.nix
index 9e9930a..fb9c684 100644
--- a/sd-image/default.nix
+++ b/sd-image/default.nix
@@ -23,6 +23,7 @@
         version = cfg.kernel-version;
         board = cfg.board;
         kernel = pkgs.rpi-kernels."${version}"."${board}";
+        initrd = "${config.system.build.initialRamdisk}/${config.system.boot.loader.initrdFile}";
         populate-kernel =
           if cfg.uboot.enable
           then ''
@@ -30,6 +31,7 @@
           ''
           else ''
             cp "${kernel}/Image" firmware/kernel.img
+            cp "${initrd}" firmware/initrd
             cp "${kernel-params}" firmware/cmdline.txt
           '';
       in