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tftpboot: move things around in memory

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new layout has rootfs followed by kernel and dtb, so that we
know the rootfs start and size to embed them into the dtb instead
of having to use dummy values and fill them in afterwards
This commit is contained in:
Daniel Barlow 2023-12-22 23:03:07 +00:00
parent bfa68d9c55
commit f25c41b4d2
1 changed files with 27 additions and 24 deletions
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51
modules/outputs/tftpboot.nix
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@ -60,43 +60,46 @@ in {
}; in choices.${cfg.kernelFormat};
cmdline = concatStringsSep " " config.boot.commandLine;
in
pkgs.runCommand "tftpboot" { nativeBuildInputs = [ pkgs.pkgsBuildBuild.dtc ]; } ''
pkgs.runCommand "tftpboot" { nativeBuildInputs = with pkgs.pkgsBuildBuild; [ lzma dtc ]; } ''
mkdir $out
cd $out
ln -s ${o.rootfs} rootfs
ln -s ${o.kernel} vmlinux
binsize() { local s=$(stat -L -c %s $1); echo $(($s + 0x1000 &(~0xfff))); }
binsize64k() { local s=$(stat -L -c %s $1); echo $(($s + 0x10000 &(~0xffff))); }
hex() { printf "0x%x" $1; }
rootfsStart=${toString cfg.loadAddress}
rootfsSize=$(binsize64k ${o.rootfs} )
imageStart=$(($rootfsStart + $rootfsSize))
imageSize=$(binsize ${image})
dtbStart=$(($imageStart + $imageSize))
dtbSize=$(binsize ${o.dtb} )
ln -s ${o.manifest} manifest
ln -s ${o.kernel.headers} build
ln -s ${o.rootfs} rootfs
ln -s ${image} image
uimageSize=$(($(stat -L -c %s ${image}) + 0x1000 &(~0xfff)))
rootfsStart=$(printf %x $((${toString cfg.loadAddress} + 0x100000 + $uimageSize &(~0xfffff) )))
rootfsBytes=$(($(stat -L -c %s ${o.rootfs}) + 0x100000 &(~0xfffff)))
rootfsBytes=$(($rootfsBytes + ${toString cfg.freeSpaceBytes} ))
cmd="mtdparts=phram0:''${rootfsBytes}(rootfs) phram.phram=phram0,0x''${rootfsStart},''${rootfsBytes},${toString config.hardware.flash.eraseBlockSize} root=/dev/mtdblock0";
dtbStart=$(printf %x $((${toString cfg.loadAddress} + $rootfsBytes + 0x100000 + $uimageSize )))
cat ${o.dtb} > $out/dtb
address_cells=$(fdtget $out/dtb / '#address-cells')
size_cells=$(fdtget $out/dtb / '#size-cells')
cat ${o.dtb} > dtb
address_cells=$(fdtget dtb / '#address-cells')
size_cells=$(fdtget dtb / '#size-cells')
if [ $address_cells -gt 1 ]; then ac_prefix=0; fi
if [ $size_cells -gt 1 ]; then sz_prefix=0; fi
fdtput -p $out/dtb /reserved-memory '#address-cells' $address_cells
fdtput -p $out/dtb /reserved-memory '#size-cells' $size_cells
fdtput -p $out/dtb /reserved-memory ranges
fdtput -p -t s $out/dtb /reserved-memory/phram-rootfs@$rootfsStart compatible phram
fdtput -p -t lx $out/dtb /reserved-memory/phram-rootfs@$rootfsStart reg $ac_prefix 0x$rootfsStart $sz_prefix $(printf %x $rootfsBytes)
fdtput -p dtb /reserved-memory '#address-cells' $address_cells
fdtput -p dtb /reserved-memory '#size-cells' $size_cells
fdtput -p dtb /reserved-memory ranges
node=$(printf "phram-rootfs@%x" $rootfsStart)
fdtput -p -t s dtb /reserved-memory/$node compatible phram
fdtput -p -t lx dtb /reserved-memory/$node reg $ac_prefix $(hex $rootfsStart) $sz_prefix $(hex $rootfsBytes)
# dtc -I dtb -O dts -o /dev/stdout $out/dtb | grep -A10 reserved-mem ; exit 1
dtbBytes=$(($(stat -L -c %s $out/dtb) + 0x1000 &(~0xfff)))
cmd="mtdparts=phram0:''${rootfsSize}(rootfs) phram.phram=phram0,''${rootfsStart},''${rootfsSize},${toString config.hardware.flash.eraseBlockSize} root=/dev/mtdblock0";
cat > $out/boot.scr << EOF
# dtc -I dtb -O dts -o /dev/stdout dtb | grep -A10 reserved-mem ; exit 1
cat > boot.scr << EOF
setenv serverip ${cfg.serverip}
setenv ipaddr ${cfg.ipaddr}
setenv bootargs 'liminix ${cmdline} $cmd'
tftpboot 0x${lib.toHexString cfg.loadAddress} result/image ; tftpboot 0x$rootfsStart result/rootfs ; tftpboot 0x$dtbStart result/dtb
${bootCommand} 0x${lib.toHexString cfg.loadAddress} - 0x$dtbStart
tftpboot $(hex $imageStart) result/image ; tftpboot $(hex $rootfsStart) result/rootfs ; tftpboot $(hex $dtbStart) result/dtb
${bootCommand} $(hex $imageStart) - $(hex $dtbStart)
EOF
'';