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generate probably-non-functional firmware image for gl-ar750

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This commit is contained in:
Daniel Barlow 2022-10-03 22:28:15 +01:00
parent a1a1abb8c7
commit f9626d00f4
6 changed files with 141 additions and 10 deletions
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30
default.nix
View file

@ -16,19 +16,33 @@ let
kernel = callPackage ./kernel {
inherit (config.kernel) config checkedConfig;
};
in {
outputs = {
outputs = rec {
inherit squashfs kernel;
default = nixpkgs.pkgs.runCommand "both-kinds" {} ''
mkdir $out
cd $out
ln -s ${squashfs} squashfs
ln -s ${kernel.vmlinux} vmlinux
'';
uimage = kernel.uimage {
inherit (device.boot) loadAddress entryPoint;
inherit (kernel) vmlinux;
};
combined-image = nixpkgs.pkgs.runCommand "firmware.bin" {
nativeBuildInputs = [ nixpkgs.buildPackages.ubootTools ];
} ''
dd if=${uimage} of=$out bs=128k conv=sync
dd if=${squashfs} of=$out bs=128k conv=sync,nocreat,notrunc oflag=append
'';
directory = nixpkgs.pkgs.runCommand "both-kinds" {} ''
mkdir $out
cd $out
ln -s ${squashfs} squashfs
ln -s ${kernel.vmlinux} vmlinux
'';
# this exists so that you can run "nix-store -q --tree" on it and find
# out what's in the image, which is nice if it's unexpectedly huge
manifest = writeText "manifest.json" (builtins.toJSON config.filesystem.contents);
};
in {
outputs = outputs // { default = outputs.${device.outputs.default}; };
# this is just here as a convenience, so that we can get a
# cross-compiling nix-shell for any package we're customizing
inherit (nixpkgs) pkgs;

69
devices/gl-ar750.nix
View file

@ -1,3 +1,21 @@
# GL.INet GL-AR750 "Creta" travel router
# - QCA9531 @650Mhz SoC
# - dual band wireless: IEEE 802.11a/b/g/n/ac
# - two 10/100Mbps LAN ports and one WAN
# - 128MB DDR2 RAM / 16MB NOR Flash
# - "ath79" soc family
# https://www.gl-inet.com/products/gl-ar750/
# I like GL.iNet devices because they're relatively accessible to
# DIY users: the serial port connections have headers preinstalled
# and don't need soldering
# The default output is a combined image containing a kernel
# packaged as a "uimage" and initrd filesystem. This can be
# downloaded to the device using TFTP and then written into
# flash, or if PHRAM suport is enabled (handy for development)
# unpacked and run directly into RAM
{
system = {
crossSystem = {
@ -8,4 +26,55 @@
};
};
};
kernel = {
checkedConfig = {
"MIPS_RAW_APPENDED_DTB" = "y";
};
config = {
# this is all copied from nixwrt ath79 config. Clearly not all
# of it is device config, some of it is wifi config or
# installation method config or ...
"BLK_DEV_INITRD" = "n";
"CMDLINE_PARTITION" = "y";
"DEBUG_INFO" = "y";
"DEVTMPFS" = "y";
"EARLY_PRINTK" = "y";
"FW_LOADER" = "y";
# we don't have a user helper, so we get multiple 60s pauses
# at boot time unless we disable trying to call it
"FW_LOADER_USER_HELPER" = "n";
"IMAGE_CMDLINE_HACK" = "n";
"IP_PNP" = "y";
"JFFS2_FS" = "n";
"MIPS_RAW_APPENDED_DTB" = "y";
"MODULE_SIG" = "y";
"MTD_CMDLINE_PARTS" = "y";
"MTD_SPLIT_FIRMWARE" = "y";
"PARTITION_ADVANCED" = "y";
"PRINTK_TIME" = "y";
"SQUASHFS" = "y";
"SQUASHFS_XZ" = "y";
"ASN1" = "y";
"ASYMMETRIC_KEY_TYPE" = "y";
"ASYMMETRIC_PUBLIC_KEY_SUBTYPE" = "y";
"CRC_CCITT" = "y";
"CRYPTO" = "y";
"CRYPTO_ARC4" = "y";
"CRYPTO_CBC" = "y";
"CRYPTO_CCM" = "y";
"CRYPTO_CMAC" = "y";
"CRYPTO_GCM" = "y";
"CRYPTO_HASH_INFO" = "y";
"CRYPTO_LIB_ARC4" = "y";
"CRYPTO_RSA" = "y";
"CRYPTO_SHA1" = "y";
"ENCRYPTED_KEYS" = "y";
"KEYS" = "y";
};
};
outputs.default = "combined-image";
boot = {
loadAddress = "0x80060000";
entryPoint = "0x80060000";
};
}

5
devices/qemu.nix
View file

@ -1,3 +1,7 @@
# This "device" generates images that can be used with the QEMU
# emulator. The default output is a directory containing separate
# kernel (uncompressed vmlinux) and initrd (squashfs) images
{
system = {
crossSystem = {
@ -446,4 +450,5 @@
VIRTIO_NET = "y";
};
};
outputs.default = "directory";
}

4
kernel/default.nix
View file

@ -34,9 +34,9 @@ let
cp -a . $out
'';
};
in
{
in rec {
vmlinux = callPackage ./vmlinux.nix {
inherit tree config checkedConfig;
};
uimage = callPackage ./uimage.nix { };
}

42
kernel/uimage.nix Normal file
View file

@ -0,0 +1,42 @@
{
lzma
, stdenv
, ubootTools
} :
let
objcopy = "${stdenv.cc.bintools.targetPrefix}objcopy";
in {
vmlinux
# , commandLine
# , fdt ? null
, entryPoint
# , extraName ? "" # e.g. socFamily
, loadAddress
} :
# patchDtbCommand = if (fdt != null) then ''
# ( cat vmlinux.stripped ${fdt} > vmlinux.tmp ) && mv vmlinux.tmp vmlinux.stripped
# '' else ''
# echo patch-cmdline vmlinux.stripped '${commandLine}'
# patch-cmdline vmlinux.stripped '${commandLine}'
# echo
# '';
stdenv.mkDerivation {
name = "kernel.image";
phases = [ "buildPhase" "installPhase" ];
nativeBuildInputs = [
# patchImage
lzma
stdenv.cc
ubootTools
];
buildPhase = ''
${objcopy} -O binary -R .reginfo -R .notes -R .note -R .comment -R .mdebug -R .note.gnu.build-id -S ${vmlinux} vmlinux.stripped
# {patchDtbCommand}
rm -f vmlinux.stripped.lzma
lzma -k -z vmlinux.stripped
mkimage -A mips -O linux -T kernel -C lzma -a ${loadAddress} -e ${entryPoint} -n 'MIPS Liminix Linux ' -d vmlinux.stripped.lzma kernel.image
'';
installPhase = ''
cp kernel.image $out
'';
}

1
modules/base.nix
View file

@ -31,6 +31,7 @@ in {
};
checkedConfig = mkOption {
type = types.attrsOf types.nonEmptyStr;
default = {};
};
};
groups = mkOption {