liminix

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uimage.nix (2312B)

      1 {
      2   lzma,
      3   stdenv,
      4   ubootTools,
      5   dtc,
      6   lib,
      7 }:
      8 let
      9   objcopy = "${stdenv.cc.bintools.targetPrefix}objcopy";
     10   arch = stdenv.hostPlatform.linuxArch;
     11   stripAndZip = ''
     12     ${objcopy} -O binary -S vmlinux.elf vmlinux.bin
     13     rm -f vmlinux.bin.lzma ; lzma -k -z  vmlinux.bin
     14   '';
     15 in
     16 {
     17   kernel,
     18   commandLine,
     19   commandLineDtbNode ? "bootargs",
     20   entryPoint,
     21   extraName ? "", # e.g. socFamily
     22   loadAddress,
     23   imageFormat,
     24   alignment ? null,
     25   dtb ? null,
     26 }:
     27 stdenv.mkDerivation {
     28   name = "kernel.image";
     29   phases = [
     30     "preparePhase"
     31     (
     32       if commandLine != null then
     33         assert dtb != null;
     34         "mungeDtbPhase"
     35       else
     36         ":"
     37     )
     38     (if imageFormat == "fit" then "buildPhaseFIT" else "buildPhaseUImage")
     39     "installPhase"
     40   ];
     41   nativeBuildInputs = [
     42     lzma
     43     dtc
     44     stdenv.cc
     45     ubootTools
     46   ];
     47   preparePhase = ''
     48     cp ${kernel} vmlinux.elf; chmod +w vmlinux.elf
     49   '';
     50   mungeDtbPhase = ''
     51     dtc -I dtb -O dts -o tmp.dts ${dtb}
     52     echo '/{ chosen { ${commandLineDtbNode} = ${builtins.toJSON commandLine}; }; };'  >> tmp.dts
     53     dtc -I dts -O dtb -o tmp.dtb tmp.dts
     54   '';
     55 
     56   buildPhaseUImage = ''
     57     test -f tmp.dtb && ${objcopy} --update-section .appended_dtb=tmp.dtb vmlinux.elf || ${objcopy} --add-section .appended_dtb=tmp.dtb vmlinux.elf
     58     ${stripAndZip}
     59     mkimage -A ${arch} -O linux -T kernel -C lzma -a 0x${lib.toHexString loadAddress} -e 0x${lib.toHexString entryPoint} -n '${lib.toUpper arch} Liminix Linux ${extraName}' -d vmlinux.bin.lzma kernel.uimage
     60   '';
     61 
     62   buildPhaseFIT = ''
     63     ${stripAndZip}
     64     cat ${./kernel_fdt.its} > mkimage.its
     65     cat << _VARS  >> mkimage.its
     66     / {
     67         images {
     68             kernel {
     69                 data = /incbin/("./vmlinux.bin.lzma");
     70                 load = <0x${lib.toHexString loadAddress}>;
     71                 entry = <0x${lib.toHexString entryPoint}>;
     72                 arch = "${arch}";
     73                 compression = "lzma";
     74             };
     75             fdt-1 {
     76                 data = /incbin/("./tmp.dtb");
     77                 arch = "${arch}";
     78             };
     79         };
     80     };
     81     _VARS
     82     mkimage -f mkimage.its -E ${
     83       lib.optionalString (alignment != null) "-B 0x${lib.toHexString alignment}"
     84     } kernel.uimage
     85     mkimage -l kernel.uimage
     86   '';
     87 
     88   installPhase = ''
     89     cp kernel.uimage $out
     90   '';
     91 }