66 lines
1.8 KiB
Nix
66 lines
1.8 KiB
Nix
{
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lzma
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, stdenv
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, ubootTools
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, dtc
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, lib
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} :
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let
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objcopy = "${stdenv.cc.bintools.targetPrefix}objcopy";
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in {
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kernel
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, commandLine
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, entryPoint
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, extraName ? "" # e.g. socFamily
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, loadAddress
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, dtb ? null
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} :
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stdenv.mkDerivation {
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name = "kernel.image";
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phases = [
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"preparePhase"
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(if dtb != null then "dtbPhase" else ":")
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"buildPhase"
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"installPhase" ];
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nativeBuildInputs = [
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lzma
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dtc
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stdenv.cc
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ubootTools
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];
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preparePhase = ''
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cp ${kernel} vmlinux.elf; chmod +w vmlinux.elf
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'';
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dtbPhase = ''
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dtc -I dtb -O dts -o tmp.dts ${dtb}
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echo '/{ chosen { bootargs = ${builtins.toJSON commandLine}; }; };' >> tmp.dts
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dtc -I dts -O dtb -o tmp.dtb tmp.dts
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'';
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buildPhase =
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let arch =
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# per output of "mkimage -A list". I *think* these
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# are the same as the kernel arch convention, but
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# maybe that's coincidence
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if stdenv.isMips
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then "mips"
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else if stdenv.isAarch64
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then "arm64"
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else throw "unknown arch";
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in ''
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${objcopy} -O binary -R .reginfo -R .notes -R .note -R .comment -R .mdebug -R .note.gnu.build-id -S vmlinux.elf vmlinux.bin
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rm -f vmlinux.bin.lzma ; lzma -k -z vmlinux.bin
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cat ${./kernel_fdt.its} > mkimage.its
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echo '/ { images { kernel { data = /incbin/("./vmlinux.bin.lzma"); }; }; };' >> mkimage.its
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echo '/ { images { kernel { load = <${loadAddress}>; }; }; };' >> mkimage.its
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echo '/ { images { kernel { entry = <${entryPoint}>; }; }; };' >> mkimage.its
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echo '/ { images { kernel { compression = "lzma"; }; }; };' >> mkimage.its
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echo '/ { images { fdt-1 { data = /incbin/("./tmp.dtb"); }; }; }; ' >> mkimage.its
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mkimage -f mkimage.its mkimage.itb
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mkimage -l mkimage.itb
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'';
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installPhase = ''
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cp mkimage.itb $out
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'';
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}
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