liminix-fork/devices/gl-ar750/default.nix
2022-10-19 17:36:31 +01:00

129 lines
4.2 KiB
Nix

# 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
# Mainline linux 5.19 doesn't have device-tree support for this device
# or even for the SoC, so we use the extensive OpenWrt kernel patches
{
system = {
crossSystem = {
config = "mips-unknown-linux-musl";
gcc = {
abi = "32";
arch = "mips32"; # maybe mips_24kc-
};
};
};
# We need to be able to import default.nix before we import nixpkgs
# because it has the system config to tell nixpkgs what arch to build for.
# But we also need some way to do things like fetchFromGitHub in the
# per-device config and we can only do that once we have a reference to
# pkgs
overlay = final: prev:
let
openwrt = final.fetchFromGitHub {
name = "openwrt-source";
repo = "openwrt";
owner = "openwrt";
rev = "a5265497a4f6da158e95d6a450cb2cb6dc085cab";
hash = "sha256-YYi4gkpLjbOK7bM2MGQjAyEBuXJ9JNXoz/JEmYf8xE8=";
};
in {
kernel = prev.kernel.override {
src = final.fetchurl {
name = "linux.tar.gz";
url = "https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.15.71.tar.gz";
hash = "sha256-yhO2cXIeIgUxkSZf/4aAsF11uxyh+UUZu6D1h92vCD8=";
};
extraPatchPhase = ''
cp -av ${openwrt}/target/linux/generic/files/* .
chmod -R u+w .
cp -av ${openwrt}/target/linux/ath79/files/* .
chmod -R u+w .
patches() {
for i in $* ; do patch --batch --forward -p1 < $i ;done
}
patches ${openwrt}/target/linux/generic/backport-5.15/*.patch
patches ${openwrt}/target/linux/generic/pending-5.15/*.patch
patches ${openwrt}/target/linux/generic/hack-5.15/*.patch
patches ${openwrt}/target/linux/ath79/patches-5.15/*.patch
'';
};
};
kernel = rec {
checkedConfig = {
MIPS_ELF_APPENDED_DTB = "y";
OF = "y";
USE_OF = "y";
ATH79 = "y";
SERIAL_8250_CONSOLE = "y";
SERIAL_8250 = "y";
SERIAL_CORE_CONSOLE = "y";
# need this to open console device at boot. dmesg goes from
# [ 0.272934] Warning: unable to open an initial console.
# to
# [ 0.247413] printk: console [ttyS0] disabled
# [ 0.25200] 18020000.uart: ttyS0 at MMIO 0x1802000 (irq = 10, base_baud = 1562500) is a 16550A
SERIAL_OF_PLATFORM = "y";
CONSOLE_LOGLEVEL_DEFAULT = "8";
CONSOLE_LOGLEVEL_QUIET = "4";
# "empty" initramfs source should create an initial
# filesystem that has a /dev/console node and not much
# else. Note that pid 1 is started *before* the root
# filesystem is mounted and it expects /dev/console to
# be present already
BLK_DEV_INITRD = "n";
NET = "y";
NETDEVICES = "y";
ETHERNET = "y";
NET_VENDOR_ATHEROS = "y";
AG71XX = "y"; # ethernet (qca,qca9530-eth)
MFD_SYSCON = "y"; # ethernet (compatible "syscon")
AR8216_PHY = "y"; # eth1 is behind a switch
MTD = "y";
MTD_CMDLINE_PARTS = "y";
MTD_BLOCK = "y"; # fix undefined ref to register_mtd_blktrans_devs
CPU_BIG_ENDIAN= "y";
# 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 ...
"CMDLINE_PARTITION" = "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";
"MODULE_SIG" = "y";
"PARTITION_ADVANCED" = "y";
"PRINTK_TIME" = "y";
"SQUASHFS" = "y";
"SQUASHFS_XZ" = "y";
};
};
outputs.default = "directory";
boot = {
loadAddress = "0x80060000";
entryPoint = "0x80060000";
};
}