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70 lines
2.7 KiB
Nix
70 lines
2.7 KiB
Nix
{ lib
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}:
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{
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overlays = [( final: prev: {
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hostPlatform =
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if prev.hostPlatform != null
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then prev.hostPlatform
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else lib.systems.examples.gnu64;
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flashrom = prev.flashrom.override {
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# AMD hardware expects to see an FMAP region called "BIOS"
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# which covers the entire ROM image; flashrom doesn't like
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# this overlapping so we have to patch it
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overlappingFmapRegionSupport = true;
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};
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scripts = let
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layoutFlags =
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# Using `flashrom --fmap-file` is undesirable because
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# there is no validation that the layout of the chip
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# we are flashing matches the `flashrom.layout` file.
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# If they don't match, bricking is likely. So please
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# use the overlappingFmapRegionSupport patch, and ask
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# the upstream maintainers to merge it.
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if final.flashrom.passthru.overlappingFmapRegionSupport
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then "--fmap"
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else "--fmap-file ${final.fmap}";
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flashromScript = moreFlags: ''
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set -euo pipefail
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${final.flashrom}/bin/flashrom -p internal $@ ${moreFlags}
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'';
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flashromWriteScript = moreFlags:
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flashromScript "-w ${final.coreboot}/coreboot.rom ${moreFlags}";
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nvramToolScript = moreFlags: ''
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set -euo pipefail
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${final.nixpkgsOnBuildForHost.nvramtool}/bin/nvramtool -y ${final.coreboot}/cmos.layout ${moreFlags}
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'';
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in prev.scripts // {
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flashrom = flashromScript "$@";
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flash-write-fallback = flashromWriteScript "${layoutFlags} -i FALLBACK";
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flash-write-normal = flashromWriteScript "${layoutFlags} -i NORMAL";
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flash-write-all = flashromWriteScript "";
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nextboot-use-fallback = nvramToolScript "-w boot_option=Fallback";
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nextboot-use-normal = nvramToolScript "-w boot_option=Normal";
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nextboot-show = nvramToolScript "-n -r boot_option";
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# FIXME(amjoseph): store the cmos.layout and cmos.default in
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# the flash chip so we don't have to worry about
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# desynchronization (parallel to --fmap-file concern above).
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nvram-tool = nvramToolScript "$@";
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nvram-all-read = nvramToolScript "-a";
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nvram-all-write = nvramToolScript "-p $1";
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nvram-all-defaults = nvramToolScript "-p ${final.coreboot}/cmos.default";
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nvram-bootcount-show = nvramToolScript "-n -r reboot_counter";
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nvram-parameter-read = nvramToolScript "-n -r $1";
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nvram-parameter-choices = nvramToolScript "-e $1";
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nvram-checksum-read = nvramToolScript "-c";
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nvram-checksum-write = nvramToolScript "-c $1";
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};
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main = prev.main.overrideAttrs(previousAttrs: {
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# cmos nvram is an x86-ism
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postInstall = (previousAttrs.postInstall or "") + ''
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ln -s ${final.coreboot}/{cmos.layout,cmos.default} $out/etc/
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'';
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});
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})];
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}
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