milkv/pioneer: init

milkv/pioneer/linuxboot-initrd.nix

@@ -0,0 +1,54 @@
+{ buildGoModule
+, fetchFromGitHub
+, fetchpatch
+, linux-firmware
+, ...
+}:
+
+# Based on
+# https://github.com/sophgo/bootloader-riscv/blob/e0839852d571df106db622611f4786ae17e8df0f/scripts/envsetup.sh#L809-L819
+
+buildGoModule rec {
+  pname = "u-root";
+  version = "0.14.0";
+  src = fetchFromGitHub {
+    owner = "u-root";
+    repo = "u-root";
+    rev = "v${version}";
+    hash = "sha256-8zA3pHf45MdUcq/MA/mf0KCTxB1viHieU/oigYwIPgo=";
+  };
+  vendorHash = null;
+  patches = [
+    (
+      fetchpatch {
+        url = "https://github.com/sophgo/bootloader-riscv/commit/322c3305763872a9b88a1c85d79bca63b8fbe7a6.patch";
+        hash = "sha256-l5r3DbcMqRYD5FhRBqtEIEscZAdDvjmQJE4BIAtWYWE=";
+        stripLen = 1;
+      }
+    )
+  ];
+
+  # We only build the u-root binary in the build phase and the initrd in the
+  # postBuild hook.
+  subPackages = [ "." ];
+  postBuild = ''
+    GOROOT="$(go env GOROOT)" $GOPATH/bin/u-root \
+      -build bb \
+      -uinitcmd=boot \
+      -files "${linux-firmware}/lib/firmware/amdgpu/:lib/firmware/amdgpu/" \
+      -files "${linux-firmware}/lib/firmware/radeon/:lib/firmware/radeon/" \
+      -o initramfs.cpio \
+      core boot
+
+    # The vendor does not compress the initrd. We do since we include more
+    # firmware files. CRC32 is required by the kernel's decompressor.
+    xz --check=crc32 initramfs.cpio
+  '';
+
+  installPhase = ''
+    install -D initramfs.cpio.xz $out/initrd.img
+  '';
+
+  # Tests time out after 10min for native riscv64 builds on the pioneer.
+  doCheck = false;
+}