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WIP: support for TFTP on 'old' uboot versions 

Older uboot versions don't have an option to
override the DTB from the `mboot` command, so
the updated DTB needs to be replaced in the image
itself.
This commit is contained in:
Arnout Engelen 2024-01-30 11:25:08 +01:00
parent 84ce618213
commit 2b35a491b5
No known key found for this signature in database
GPG Key ID: 061107B0F74A6DAA
1 changed files with 14 additions and 2 deletions
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16
modules/outputs/tftpboot.nix
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@ -63,8 +63,13 @@ in {
zimage = "bootz";
}; in choices.${cfg.kernelFormat};
cmdline = concatStringsSep " " config.boot.commandLine;
objcopy = "${pkgs.stdenv.cc.bintools.targetPrefix}objcopy";
stripAndZip = ''
${objcopy} -O binary -R .reginfo -R .notes -R .note -R .comment -R .mdebug -R .note.gnu.build-id -S vmlinux.elf vmlinux.bin
rm -f vmlinux.bin.lzma ; lzma -k -z vmlinux.bin
'';
in
pkgs.runCommand "tftpboot" { nativeBuildInputs = with pkgs.pkgsBuildBuild; [ lzma dtc ]; } ''
pkgs.runCommand "tftpboot" { nativeBuildInputs = with pkgs.pkgsBuildBuild; [ lzma dtc pkgs.stdenv.cc ubootTools ]; } ''
mkdir $out
cd $out
binsize() { local s=$(stat -L -c %s $1); echo $(($s + 0x1000 &(~0xfff))); }
@ -77,12 +82,12 @@ in {
imageSize=$(binsize ${image})
ln -s ${o.manifest} manifest
ln -s ${image} image
ln -s ${o.kernel} vmlinux # handy for gdb
${if cfg.compressRoot
then ''
lzma -z9cv ${o.rootfs} > rootfs.lz
# TODO this is no longer correct
rootfsLzStart=$(($imageStart + $imageSize))
rootfsLzSize=$(binsize rootfs.lz)
''
@ -107,6 +112,13 @@ in {
cmd="liminix ${cmdline} mtdparts=phram0:''${rootfsSize}(rootfs) phram.phram=phram0,''${rootfsStart},''${rootfsSize},${toString config.hardware.flash.eraseBlockSize} root=/dev/mtdblock0";
fdtput -t s dtb /chosen bootargs "$cmd"
# re-package image with updated dtb
cp ${o.kernel} vmlinux.elf; chmod +w vmlinux.elf
${objcopy} --update-section .appended_dtb=dtb vmlinux.elf
${stripAndZip}
# TODO don't hardcode mips, entryPoint, loadAddress, name
mkimage -A mips -O linux -T kernel -C lzma -a 0x80001000 -e 0x80001000 -n 'MIPS Liminix Linux' -d vmlinux.bin.lzma image
# dtc -I dtb -O dts -o /dev/stdout dtb | grep -A10 chosen ; exit 1
cat > boot.scr << EOF