make rootfs work with tftpbootlz
This commit is contained in:
Daniel Barlow
parent
d1e2d525a4
commit
9ca9723c9d
1 changed files with 46 additions and 43 deletions
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@ -10,34 +10,52 @@ let
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o = config.system.outputs;
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cmdline = concatStringsSep " " config.boot.commandLine;
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cfg = config.boot.tftp;
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boot-scr =
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pkgs.buildPackages.runCommand "boot-scr" { nativeBuildInputs = [ pkgs.pkgsBuildBuild.dtc ]; } ''
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uimageSize=$(($(stat -L -c %s ${o.zimage}) + 0x1000 &(~0xfff)))
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rootfsStart=0x$(printf %x $((${toString cfg.loadAddress} + 0x100000 + $uimageSize &(~0xfffff) )))
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rootfsBytes=$(($(stat -L -c %s ${o.rootfs}) + 0x100000 &(~0xfffff)))
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rootfsBytes=$(($rootfsBytes + ${toString cfg.freeSpaceBytes} ))
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rootfsMb=$(($rootfsBytes >> 20))
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cmd="mtdparts=phram0:''${rootfsMb}M(rootfs) phram.phram=phram0,''${rootfsStart},''${rootfsBytes},${toString config.hardware.flash.eraseBlockSize} root=/dev/mtdblock0";
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tftpbootlz =
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pkgs.buildPackages.runCommand "tftpbootlz" {
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nativeBuildInputs = with pkgs.pkgsBuildBuild; [ lzma dtc ];
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} ''
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binsize() { local s=$(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" $1; }
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dtbStart=$(printf %x $((${toString cfg.loadAddress} + $rootfsBytes + 0x100000 + $uimageSize )))
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mkdir $out
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kernelStart=${toString cfg.loadAddress}
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kernelSize=$(binsize ${o.zimage})
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mkdir -p $out
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cat ${o.dtb} > $out/dtb
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fdtput -p -t lx $out/dtb /reserved-memory '#address-cells' 1
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fdtput -t lx $out/dtb /reserved-memory '#size-cells' 1
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fdtput $out/dtb /reserved-memory ranges
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fdtput -p -t s $out/dtb /reserved-memory/phram-rootfs compatible phram
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fdtput -p -t lx $out/dtb /reserved-memory/phram-rootfs reg 0 $rootfsStart 0 $(printf %x $rootfsBytes)
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# can't calculate the actual address here until we know how
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# big the dtb will be
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fdtput -t lx $out/dtb /reserved-memory/phram-rootfs reg 0xdead 0xcafe
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dtbStart=$(($kernelStart + $kernelSize))
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dtbSize=$(binsize $out/dtb)
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rootfsOrigSize=$(binsize64k ${o.rootfs})
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lzma -z9cv ${o.rootfs} > $out/rootfs.lz
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dtbBytes=$(($(stat -L -c %s $out/dtb) + 0x1000 &(~0xfff)))
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rootfsLzSize=$(binsize $out/rootfs.lz)
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rootfsLzStart=$(($dtbStart + $dtbSize))
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rootfsOrigStart=$(($rootfsLzStart + $rootfsLzSize))
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fdtput -t lx $out/dtb /reserved-memory/phram-rootfs reg $(printf "%x" $rootfsOrigStart) $(printf "%x" $rootfsOrigSize)
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# dtc -I dtb -O dts -o /dev/stdout $out/dtb ; exit 1
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cat > $out/script << EOF
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cmd="mtdparts=phram0:''${rootfsOrigSize}(rootfs) phram.phram=phram0,''${rootfsOrigStart},''${rootfsOrigSize},${toString config.hardware.flash.eraseBlockSize} root=/dev/mtdblock0";
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(cd $out;
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ln -s ${o.zimage} zImage
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ln -s ${o.manifest} manifest
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ln -s ${o.kernel.headers} build)
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cat > $out/boot.scr << EOF
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setenv serverip ${cfg.serverip}
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setenv ipaddr ${cfg.ipaddr}
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setenv bootargs 'liminix ${cmdline} $cmd'
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tftpboot 0x${lib.toHexString cfg.loadAddress} result/zImage; tftpboot 0x$(printf %x $rootfsStart) result/rootfs ; tftpboot 0x$dtbStart result/dtb
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setexpr bootaddr 0x$dtbStart + \$filesize
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# lzmadec 0x${lib.toHexString cfg.loadAddress} \$bootaddr
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# bootz \$bootaddr - 0x$dtbStart
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bootz 0x${lib.toHexString cfg.loadAddress} - 0x$dtbStart
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setenv bootargs "liminix ${cmdline} $cmd"
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tftpboot $(hex $kernelStart) result/zImage; tftpboot $(hex $dtbStart) result/dtb ; tftpboot $(hex $rootfsLzStart) result/rootfs.lz
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lzmadec $(hex $rootfsLzStart) $(hex $rootfsOrigStart)
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bootz $(hex $kernelStart) - $(hex $dtbStart)
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EOF
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'';
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in {
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imports = [ ../ramdisk.nix ];
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@ -53,35 +71,20 @@ in {
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**********
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This is a variant of the tftpboot output intended for the
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Turris Omnia. It builds a uimage containing an uncompressed
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kernel, then compresses the resulting image to be decompressed
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using the u-boot lzmadec command. This is a workaround for an
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awkwardly low CONFIG_SYS_BOOTM_LEN setting in the U-Boot build
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for the device, which means that the regular tftpboot output
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would only work for very small kernels.
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Turris Omnia. It uses a zImage instead of a uimage, as a
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workaround for an awkwardly low CONFIG_SYS_BOOTM_LEN setting
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in the U-Boot build for the device which means it won't boot
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uimages unless they're teeny tiny.
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As a bonus, it also uses lzma compression on the rootfs,
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which reduces a 20MB ext4 image to around 4MB
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'';
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};
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};
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config = {
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boot.ramdisk.enable = true;
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system.outputs = {
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tftpbootlz =
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let
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o = config.system.outputs; in
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pkgs.runCommand "tftpboot" {
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depsBuildBuild = [ pkgs.pkgsBuildBuild.lzma ];
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} ''
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mkdir $out
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cd $out
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ln -s ${o.rootfs} rootfs
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ln -s ${o.zimage} zImage
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ln -s ${o.manifest} manifest
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ln -s ${o.kernel.headers} build
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# lzma -c -z -9 < {uimage} > uimage.lz
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ln -s ${boot-scr}/dtb dtb
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ln -s ${boot-scr}/script boot.scr
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'';
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inherit tftpbootlz;
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};
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};
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}
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