make tftpboot work on devices with old u-boot
Some devices have a U-boot variant that does not accept a third parameter on the "bootm" command, meaning we can't override the dtb in the bootloader so have to smush it back into the kernel image This is WIP because - still hardcodes MIPS - doesn't work in QEMU Based on https://gti.telent.net/raboof/liminix/src/branch/tftp-old-uboot Co-authored-by: Arnout Engelen <arnout@bzzt.net>
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@ -7,6 +7,7 @@
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let
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inherit (lib) mkOption types concatStringsSep;
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cfg = config.boot.tftp;
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hw = config.hardware;
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in {
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imports = [ ../ramdisk.nix ];
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options.boot.tftp = {
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@ -22,6 +23,10 @@ in {
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type = types.bool;
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default = false;
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};
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appendDTB = mkOption {
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type = types.bool;
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default = false;
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};
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};
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options.system.outputs = {
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tftpboot = mkOption {
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@ -62,24 +67,46 @@ in {
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uimage = "bootm";
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zimage = "bootz";
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}; in choices.${cfg.kernelFormat};
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cmdline = concatStringsSep " " config.boot.commandLine;
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objcopy = "${pkgs.stdenv.cc.bintools.targetPrefix}objcopy";
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stripAndZip = ''
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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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'';
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in
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pkgs.runCommand "tftpboot" { nativeBuildInputs = with pkgs.pkgsBuildBuild; [ lzma dtc ]; } ''
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pkgs.runCommand "tftpboot" { nativeBuildInputs = with pkgs.pkgsBuildBuild; [ lzma dtc pkgs.stdenv.cc ubootTools ]; } ''
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mkdir $out
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cd $out
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binsize() { local s=$(stat -L -c %s $1); echo $(($s + 0x1000 &(~0xfff))); }
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binsize64k() { local s=$(stat -L -c %s $1); echo $(($s + 0x10000 &(~0xffff))); }
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hex() { printf "0x%x" $1; }
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rootfsStart=${toString cfg.loadAddress}
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rootfsSize=$(binsize64k ${o.rootfs} )
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rootfsSize=$(($rootfsSize + ${toString cfg.freeSpaceBytes} ))
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dtbStart=$(($rootfsStart + $rootfsSize))
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imageSize=$(binsize ${image})
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ln -s ${o.manifest} manifest
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ln -s ${image} image
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ln -s ${o.kernel} vmlinux # handy for gdb
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# if we are transferring kernel and dtb separately, the
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# dtb has to precede the kernel in ram, because zimage
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# decompression code will assume that any memory after the
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# end of the kernel is free
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dtbStart=$(($rootfsStart + $rootfsSize))
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${if cfg.compressRoot
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then ''
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lzma -z9cv ${o.rootfs} > rootfs.lz
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rootfsLzStart=$dtbStart
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rootfsLzSize=$(binsize rootfs.lz)
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dtbStart=$(($dtbStart + $rootfsLzSize))
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''
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else ''
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ln -s ${o.rootfs} rootfs
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''
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}
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cat ${o.dtb} > dtb
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address_cells=$(fdtget dtb / '#address-cells')
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size_cells=$(fdtget dtb / '#size-cells')
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@ -93,34 +120,41 @@ in {
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fdtput -p -t s dtb /reserved-memory/$node compatible phram
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fdtput -p -t lx dtb /reserved-memory/$node reg $ac_prefix $(hex $rootfsStart) $sz_prefix $(hex $rootfsSize)
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dtbSize=$(binsize ./dtb )
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imageStart=$(($dtbStart + $dtbSize))
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${if cfg.compressRoot
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then ''
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lzma -z9cv ${o.rootfs} > rootfs.lz
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rootfsLzStart=$(($imageStart + $imageSize))
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rootfsLzSize=$(binsize rootfs.lz)
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''
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else "ln -s ${o.rootfs} rootfs"
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}
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cmd="liminix ${cmdline} mtdparts=phram0:''${rootfsSize}(rootfs) phram.phram=phram0,''${rootfsStart},''${rootfsSize},${toString config.hardware.flash.eraseBlockSize} root=/dev/mtdblock0";
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fdtput -t s dtb /chosen bootargs "$cmd"
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# dtc -I dtb -O dts -o /dev/stdout dtb | grep -A10 chosen ; exit 1
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dtbSize=$(binsize ./dtb )
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${if cfg.appendDTB then ''
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imageStart=$dtbStart
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# re-package image with updated dtb
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cat ${o.kernel} > vmlinux.elf
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${objcopy} --update-section .appended_dtb=dtb vmlinux.elf
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${stripAndZip}
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# TODO don't hardcode mips, entryPoint, loadAddress, name
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mkimage -A mips -O linux -T kernel -C lzma -a $(hex ${toString hw.loadAddress}) -e $(hex ${toString hw.entryPoint}) -n 'MIPS Liminix Linux' -d vmlinux.bin.lzma image
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# dtc -I dtb -O dts -o /dev/stdout dtb | grep -A10 chosen ; exit 1
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tftpcmd="tftpboot $(hex $imageStart) result/image "
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bootcmd="bootm $(hex $imageStart)"
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'' else ''
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imageStart=$(($dtbStart + $dtbSize))
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tftpcmd="tftpboot $(hex $imageStart) result/image; tftpboot $(hex $dtbStart) result/dtb "
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ln -s ${image} image
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bootcmd="${bootCommand} $(hex $imageStart) - $(hex $dtbStart)"
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''}
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cat > boot.scr << EOF
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setenv serverip ${cfg.serverip}
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setenv ipaddr ${cfg.ipaddr}
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tftpboot $(hex $imageStart) result/image ; ${
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${
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if cfg.compressRoot
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then "tftpboot $(hex $rootfsLzStart) result/rootfs.lz"
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else "tftpboot $(hex $rootfsStart) result/rootfs"
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}; tftpboot $(hex $dtbStart) result/dtb
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}; $tftpcmd
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${if cfg.compressRoot
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then "lzmadec $(hex $rootfsLzStart) $(hex $rootfsStart); "
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else ""
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} ${bootCommand} $(hex $imageStart) - $(hex $dtbStart)
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} $bootcmd
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EOF
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'';
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@ -12,7 +12,7 @@ let derivation = (import liminix {
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img = derivation.outputs.tftpboot;
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uboot = derivation.outputs.u-boot;
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pkgsBuild = derivation.pkgs.pkgsBuildBuild;
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in pkgsBuild.runCommand "check" {
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in pkgsBuild.runCommand "check-${deviceName}" {
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nativeBuildInputs = with pkgsBuild; [
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expect
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socat
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@ -44,4 +44,7 @@ in {
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mipsLz = check "qemu" {
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boot.tftp.compressRoot = true;
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};
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mipsOldUboot = check "qemu" {
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boot.tftp.appendDTB = true;
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};
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}
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