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add 'phram' param for tftp boot without flashing

module-based-network
Daniel Barlow 2022-10-07 00:24:35 +01:00
parent e78028e58f
commit 5feda1a1e6
2 changed files with 51 additions and 1 deletions
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23
default.nix
View File

@ -1,4 +1,6 @@
{ device ? (import devices/gl-ar750.nix)
{
device ? (import devices/gl-ar750.nix)
, phram ? false
}:
let
@ -12,6 +14,7 @@ let
<liminix-config>
./modules/s6
./modules/users.nix
(if phram then ./modules/phram.nix else (args: {}))
] nixpkgs.pkgs;
squashfs = liminix.builders.squashfs config.filesystem.contents;
kernel = callPackage ./kernel {
@ -37,6 +40,22 @@ let
dd if=${uimage} of=$out/firmware.bin bs=128k conv=sync
dd if=${squashfs} of=$out/firmware.bin bs=128k conv=sync,nocreat,notrunc oflag=append
'';
boot-scr =
let
inherit (nixpkgs.lib.trivial) toHexString;
uimageStart = 10485760; # 0xa00000
squashfsStart = uimageStart + 2 * 1024 * 1024;
squashfsSize = 8;
cmd = "mtdparts=phram0:${toString squashfsSize}M(nix) phram.phram=phram0,0x${toHexString squashfsStart},${toString squashfsSize}Mi memmap=${toString squashfsSize}M\$0x${toHexString squashfsStart} root=1f00";
in
nixpkgs.pkgs.buildPackages.writeScript "firmware.bin" ''
setenv serverip 192.168.8.148
setenv ipaddr 192.168.8.251
setenv bootargs '${concatStringsSep " " config.boot.commandLine} ${cmd}'
tftp 0x8${toHexString uimageStart} result/uimage ; tftp 0x8${toHexString squashfsStart} result/squashfs
bootm 0x${toHexString uimageStart}
'';
directory = nixpkgs.pkgs.runCommand "liminix" {} ''
mkdir $out
cd $out
@ -44,6 +63,8 @@ let
ln -s ${kernel.vmlinux} vmlinux
ln -s ${manifest} manifest
ln -s ${uimage} uimage
${if phram then "ln -s ${boot-scr} boot.scr" else ""}
ln -s ${boot-scr} flash.scr
'';
# this exists so that you can run "nix-store -q --tree" on it and find
# out what's in the image, which is nice if it's unexpectedly huge

29
modules/phram.nix Normal file
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@ -0,0 +1,29 @@
{
config
, ...
}:
{
config = {
kernel = {
checkedConfig = {
MTD = "y";
MTD_PHRAM = "y";
MTD_CMDLINE_PARTS = "y";
# one or more of the following is required to get from
# VFS: Cannot open root device "1f00" or unknown-block(31,0): error -6
# to
# VFS: Mounted root (squashfs filesystem) readonly on device 31:0.
MTD_OF_PARTS = "y";
PARTITION_ADVANCED = "y";
MSDOS_PARTITION = "y";
EFI_PARTITION = "y";
MTD_BLKDEVS = "y";
MTD_BLOCK = "y";
# CONFIG_MTD_MTDRAM=m c'est quoi?
};
};
};
}