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aarch64: make tftpboot work

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- patch dtb to add reserved-memory stanza for the phram device to use
  (aarch64 does not accept memmap= command line option)

- patch phram driver to use memremap() instead of ioremap() as
  ioremap can't be used for system ram on arm devices
This commit is contained in:
Daniel Barlow
2023-10-02 17:14:47 +01:00
parent 1c4412a1f4
commit c18f07f02f
3 changed files with 68 additions and 8 deletions
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28
modules/tftpboot.nix
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@@ -42,27 +42,39 @@ in {
ln -s ${o.manifest} manifest
ln -s ${o.kernel.headers} build
ln -s ${o.uimage} uimage
ln -s ${o.boot-scr} boot.scr
ln -s ${o.boot-scr}/dtb dtb
ln -s ${o.boot-scr}/script boot.scr
'';
boot-scr =
let
inherit (pkgs.lib.trivial) toHexString;
o = config.system.outputs;
cmdline = concatStringsSep " " config.boot.commandLine;
in
pkgs.buildPackages.runCommand "boot-scr" {} ''
pkgs.buildPackages.runCommand "boot-scr" { nativeBuildInputs = [ pkgs.pkgsBuildBuild.dtc ]; } ''
uimageSize=$(($(stat -L -c %s ${o.uimage}) + 0x1000 &(~0xfff)))
rootfsStart=0x$(printf %x $((${cfg.loadAddress} + 0x100000 + $uimageSize)))
rootfsStart=0x$(printf %x $((${cfg.loadAddress} + 0x100000 + $uimageSize &(~0xfffff) )))
rootfsBytes=$(($(stat -L -c %s ${o.rootfs}) + 0x100000 &(~0xfffff)))
rootfsMb=$(($rootfsBytes >> 20))
rootfsBytes=$(($rootfsBytes + ${toString cfg.freeSpaceBytes} ))
cmd="mtdparts=phram0:''${rootfsMb}M(rootfs) phram.phram=phram0,''${rootfsStart},''${rootfsBytes},${config.hardware.flash.eraseBlockSize} memmap=''${rootfsBytes}\$''${rootfsStart} root=/dev/mtdblock0";
cmd="mtdparts=phram0:''${rootfsMb}M(rootfs) phram.phram=phram0,''${rootfsStart},''${rootfsBytes},${config.hardware.flash.eraseBlockSize} root=/dev/mtdblock0";
cat > $out << EOF
dtbStart=$(printf %x $((${cfg.loadAddress} + $rootfsBytes + 0x100000 + $uimageSize )))
mkdir $out
cat ${o.dtb} > $out/dtb
fdtput -p -t s $out/dtb /reserved-memory/phram-rootfs compatible phram
fdtput -p -t lx $out/dtb /reserved-memory/phram-rootfs reg 0 $rootfsStart 0 $rootfsBytes
dtbBytes=$(($(stat -L -c %s $out/dtb) + 0x1000 &(~0xfff)))
cat > $out/script << EOF
setenv serverip ${cfg.serverip}
setenv ipaddr ${cfg.ipaddr}
setenv bootargs 'liminix $cmd'
tftp 0x$(printf %x ${cfg.loadAddress}) result/uimage ; tftp 0x$(printf %x $rootfsStart) result/rootfs
bootm 0x$(printf %x ${cfg.loadAddress})
setenv bootargs 'liminix ${cmdline} $cmd'
tftp 0x$(printf %x ${cfg.loadAddress}) result/uimage ; tftp 0x$(printf %x $rootfsStart) result/rootfs ; tftp 0x$dtbStart result/dtb
bootm 0x$(printf %x ${cfg.loadAddress}) - 0x$dtbStart
EOF
'';
};