liminix/modules/outputs/tftpbootlz.nix

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{
config
, pkgs
, lib
, ...
}:
let
inherit (lib) mkOption types concatStringsSep;
inherit (pkgs.lib.trivial) toHexString;
o = config.system.outputs;
cmdline = concatStringsSep " " config.boot.commandLine;
cfg = config.boot.tftp;
boot-scr =
pkgs.buildPackages.runCommand "boot-scr" { nativeBuildInputs = [ pkgs.pkgsBuildBuild.dtc ]; } ''
uimageSize=$(($(stat -L -c %s ${o.zimage}) + 0x1000 &(~0xfff)))
rootfsStart=0x$(printf %x $((${toString cfg.loadAddress} + 0x100000 + $uimageSize &(~0xfffff) )))
rootfsBytes=$(($(stat -L -c %s ${o.rootfs}) + 0x100000 &(~0xfffff)))
rootfsBytes=$(($rootfsBytes + ${toString cfg.freeSpaceBytes} ))
rootfsMb=$(($rootfsBytes >> 20))
cmd="mtdparts=phram0:''${rootfsMb}M(rootfs) phram.phram=phram0,''${rootfsStart},''${rootfsBytes},${toString config.hardware.flash.eraseBlockSize} root=/dev/mtdblock0";
dtbStart=$(printf %x $((${toString 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 $(printf %x $rootfsBytes)
dtbBytes=$(($(stat -L -c %s $out/dtb) + 0x1000 &(~0xfff)))
cat > $out/script << EOF
setenv serverip ${cfg.serverip}
setenv ipaddr ${cfg.ipaddr}
setenv bootargs 'liminix ${cmdline} $cmd'
tftpboot 0x${lib.toHexString cfg.loadAddress} result/zImage; tftpboot 0x$(printf %x $rootfsStart) result/rootfs ; tftpboot 0x$dtbStart result/dtb
setexpr bootaddr 0x$dtbStart + \$filesize
# lzmadec 0x${lib.toHexString cfg.loadAddress} \$bootaddr
# bootz \$bootaddr - 0x$dtbStart
bootz 0x${lib.toHexString cfg.loadAddress} - 0x$dtbStart
EOF
'';
in {
imports = [ ../ramdisk.nix ];
options.boot.tftp.freeSpaceBytes = mkOption {
type = types.int;
default = 0;
};
options.system.outputs = {
tftpbootlz = mkOption {
type = types.package;
description = ''
tftpbootlz
**********
This is a variant of the tftpboot output intended for the
Turris Omnia. It builds a uimage containing an uncompressed
kernel, then compresses the resulting image to be decompressed
using the u-boot lzmadec command. This is a workaround for an
awkwardly low CONFIG_SYS_BOOTM_LEN setting in the U-Boot build
for the device, which means that the regular tftpboot output
would only work for very small kernels.
'';
};
};
config = {
boot.ramdisk.enable = true;
system.outputs = {
tftpbootlz =
let
o = config.system.outputs; in
pkgs.runCommand "tftpboot" {
depsBuildBuild = [ pkgs.pkgsBuildBuild.lzma ];
} ''
mkdir $out
cd $out
ln -s ${o.rootfs} rootfs
ln -s ${o.zimage} zImage
ln -s ${o.manifest} manifest
ln -s ${o.kernel.headers} build
# lzma -c -z -9 < {uimage} > uimage.lz
ln -s ${boot-scr}/dtb dtb
ln -s ${boot-scr}/script boot.scr
'';
};
};
}