liminix-fork/modules/initramfs.nix
Daniel Barlow 4cfaed7303 specify root device as /dev/mtdblockn
the (openwrt?) magic that autodetects it based on mtd labels
won't work with a two-stage boot
2023-04-26 22:16:15 +01:00

47 lines
1.2 KiB
Nix

{
config
, pkgs
, lib
, ...
}:
let
inherit (lib) mkEnableOption mkIf;
inherit (pkgs) runCommand callPackage writeText;
in
{
options = {
boot.initramfs = {
enable = mkEnableOption "enable initramfs";
default = false;
};
};
config = mkIf config.boot.initramfs.enable {
kernel.config = {
BLK_DEV_INITRD = "y";
INITRAMFS_SOURCE = builtins.toJSON "${config.outputs.initramfs}";
# INITRAMFS_COMPRESSION_LZO = "y";
};
outputs = {
initramfs =
let inherit (pkgs.pkgsBuildBuild) gen_init_cpio;
in runCommand "initramfs.cpio" {} ''
cat << SPECIALS | ${gen_init_cpio}/bin/gen_init_cpio /dev/stdin > $out
dir /proc 0755 0 0
dir /dev 0755 0 0
nod /dev/console 0600 0 0 c 5 1
nod /dev/mtdblock0 0600 0 0 b 31 0
nod /dev/mtdblock1 0600 0 0 b 31 1
nod /dev/mtdblock2 0600 0 0 b 31 2
nod /dev/mtdblock3 0600 0 0 b 31 3
nod /dev/mtdblock4 0600 0 0 b 31 4
nod /dev/mtdblock5 0600 0 0 b 31 5
dir /target 0755 0 0
dir /target/persist 0755 0 0
dir /target/nix 0755 0 0
file /init ${pkgs.preinit}/bin/preinit 0755 0 0
SPECIALS
'';
};
};
}