129 lines
4.2 KiB
Nix
129 lines
4.2 KiB
Nix
# GL.INet GL-AR750 "Creta" travel router
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# - QCA9531 @650Mhz SoC
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# - dual band wireless: IEEE 802.11a/b/g/n/ac
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# - two 10/100Mbps LAN ports and one WAN
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# - 128MB DDR2 RAM / 16MB NOR Flash
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# - "ath79" soc family
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# https://www.gl-inet.com/products/gl-ar750/
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# I like GL.iNet devices because they're relatively accessible to
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# DIY users: the serial port connections have headers preinstalled
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# and don't need soldering
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# Mainline linux 5.19 doesn't have device-tree support for this device
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# or even for the SoC, so we use the extensive OpenWrt kernel patches
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{
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system = {
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crossSystem = {
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config = "mips-unknown-linux-musl";
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gcc = {
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abi = "32";
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arch = "mips32"; # maybe mips_24kc-
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};
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};
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};
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# We need to be able to import default.nix before we import nixpkgs
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# because it has the system config to tell nixpkgs what arch to build for.
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# But we also need some way to do things like fetchFromGitHub in the
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# per-device config and we can only do that once we have a reference to
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# pkgs
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overlay = final: prev:
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let
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openwrt = final.fetchFromGitHub {
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name = "openwrt-source";
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repo = "openwrt";
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owner = "openwrt";
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rev = "a5265497a4f6da158e95d6a450cb2cb6dc085cab";
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hash = "sha256-YYi4gkpLjbOK7bM2MGQjAyEBuXJ9JNXoz/JEmYf8xE8=";
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};
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in {
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kernel = prev.kernel.override {
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src = final.fetchurl {
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name = "linux.tar.gz";
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url = "https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.15.71.tar.gz";
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hash = "sha256-yhO2cXIeIgUxkSZf/4aAsF11uxyh+UUZu6D1h92vCD8=";
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};
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extraPatchPhase = ''
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cp -av ${openwrt}/target/linux/generic/files/* .
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chmod -R u+w .
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cp -av ${openwrt}/target/linux/ath79/files/* .
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chmod -R u+w .
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patches() {
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for i in $* ; do patch --batch --forward -p1 < $i ;done
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}
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patches ${openwrt}/target/linux/generic/backport-5.15/*.patch
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patches ${openwrt}/target/linux/generic/pending-5.15/*.patch
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patches ${openwrt}/target/linux/generic/hack-5.15/*.patch
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patches ${openwrt}/target/linux/ath79/patches-5.15/*.patch
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'';
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};
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};
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kernel = rec {
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checkedConfig = {
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MIPS_ELF_APPENDED_DTB = "y";
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OF = "y";
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USE_OF = "y";
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ATH79 = "y";
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SERIAL_8250_CONSOLE = "y";
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SERIAL_8250 = "y";
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SERIAL_CORE_CONSOLE = "y";
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# need this to open console device at boot. dmesg goes from
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# [ 0.272934] Warning: unable to open an initial console.
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# to
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# [ 0.247413] printk: console [ttyS0] disabled
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# [ 0.25200] 18020000.uart: ttyS0 at MMIO 0x1802000 (irq = 10, base_baud = 1562500) is a 16550A
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SERIAL_OF_PLATFORM = "y";
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CONSOLE_LOGLEVEL_DEFAULT = "8";
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CONSOLE_LOGLEVEL_QUIET = "4";
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# "empty" initramfs source should create an initial
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# filesystem that has a /dev/console node and not much
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# else. Note that pid 1 is started *before* the root
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# filesystem is mounted and it expects /dev/console to
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# be present already
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BLK_DEV_INITRD = "n";
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NET = "y";
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NETDEVICES = "y";
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ETHERNET = "y";
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NET_VENDOR_ATHEROS = "y";
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AG71XX = "y"; # ethernet (qca,qca9530-eth)
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MFD_SYSCON = "y"; # ethernet (compatible "syscon")
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AR8216_PHY = "y"; # eth1 is behind a switch
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MTD = "y";
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MTD_CMDLINE_PARTS = "y";
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MTD_BLOCK = "y"; # fix undefined ref to register_mtd_blktrans_devs
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CPU_BIG_ENDIAN= "y";
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# this is all copied from nixwrt ath79 config. Clearly not all
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# of it is device config, some of it is wifi config or
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# installation method config or ...
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"CMDLINE_PARTITION" = "y";
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"EARLY_PRINTK" = "y";
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"FW_LOADER" = "y";
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# we don't have a user helper, so we get multiple 60s pauses
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# at boot time unless we disable trying to call it
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"FW_LOADER_USER_HELPER" = "n";
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"MODULE_SIG" = "y";
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"PARTITION_ADVANCED" = "y";
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"PRINTK_TIME" = "y";
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"SQUASHFS" = "y";
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"SQUASHFS_XZ" = "y";
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};
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};
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outputs.default = "directory";
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boot = {
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loadAddress = "0x80060000";
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entryPoint = "0x80060000";
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};
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}
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