f1b7780537
by having two separate derivations for patching the kernel source tree and building it, we have to copy said source trees from one store location to another which takes non-neglible time on spinning rust (literally minutes on my machine). Replace with a single derivation that can do more things on one tree in-place
54 lines
1.3 KiB
Nix
54 lines
1.3 KiB
Nix
# This "device" generates images that can be used with the QEMU
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# emulator. The default output is a directory containing separate
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# kernel (uncompressed vmlinux) and initrd (squashfs) images
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{
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system = {
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crossSystem = {
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config = "mips-unknown-linux-musl";
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gcc = {
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abi = "32";
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arch = "mips32"; # maybe mips_24kc-
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};
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};
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};
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overlay = final: prev:
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let inherit (final) stdenvNoCC fetchFromGitHub;
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in {
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kernel = prev.kernel.override {
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# using fetchurl not fetchzip because it doesn't unpack, and
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# copying 6GB of data from one store location to another
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# takes an absolute bloody age
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src = final.fetchurl {
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name = "linux.tar.gz";
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url = "https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.19.16.tar.gz";
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hash = "sha256-m4NeoEsCEK0HSIKTZ6zYTgk1fD3W0PSOMXN6fyHpkP8=";
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};
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};
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};
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kernel = {
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checkedConfig = {
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MIPS_MALTA= "y";
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CPU_LITTLE_ENDIAN= "n";
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CPU_BIG_ENDIAN= "y";
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CPU_MIPS32_R2= "y";
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SQUASHFS = "y";
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SQUASHFS_XZ = "y";
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VIRTIO_MENU = "y";
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PCI = "y";
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VIRTIO_PCI = "y";
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BLOCK = "y";
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VIRTIO_BLK = "y";
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NETDEVICES = "y";
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VIRTIO_NET = "y";
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SERIAL_8250= "y";
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SERIAL_8250_CONSOLE= "y";
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};
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};
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outputs.default = "directory";
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}
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