liminix/devices/qemu/default.nix

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# This "device" generates images that can be used with the QEMU
# emulator. The default output is a directory containing separate
# kernel (uncompressed vmlinux) and initrd (squashfs) images
{
system = {
crossSystem = {
config = "mips-unknown-linux-musl";
gcc = {
abi = "32";
arch = "mips32"; # maybe mips_24kc-
};
};
};
overlay = final: prev:
let inherit (final) stdenvNoCC fetchFromGitHub;
in {
kernel = prev.kernel.override {
# using fetchurl not fetchzip because it doesn't unpack, and
# copying 6GB of data from one store location to another
# takes an absolute bloody age
src = final.fetchurl {
name = "linux.tar.gz";
url = "https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.19.16.tar.gz";
hash = "sha256-m4NeoEsCEK0HSIKTZ6zYTgk1fD3W0PSOMXN6fyHpkP8=";
};
};
};
kernel = {
checkedConfig = {
MIPS_MALTA= "y";
CPU_LITTLE_ENDIAN= "n";
CPU_BIG_ENDIAN= "y";
CPU_MIPS32_R2= "y";
SQUASHFS = "y";
SQUASHFS_XZ = "y";
VIRTIO_MENU = "y";
PCI = "y";
VIRTIO_PCI = "y";
BLOCK = "y";
VIRTIO_BLK = "y";
NETDEVICES = "y";
VIRTIO_NET = "y";
SERIAL_8250= "y";
SERIAL_8250_CONSOLE= "y";
};
};
outputs.default = "directory";
}