328 lines
11 KiB
Nix
328 lines
11 KiB
Nix
{
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description = ''
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== Belkin RT-3200 / Linksys E8450
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This device is based on a 64 bit Mediatek MT7622 ARM platform, and has
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been powering my (Daniel's) home network since February 2025.
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=== Hardware summary
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* MediaTek MT7622BV (1350MHz)
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* 128MB NAND flash
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* 512MB RAM
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* b/g/n wireless using MediaTek MT7622BV (MT7615E driver)
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* a/n/ac/ax wireless using MediaTek MT7915E
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=== Installation
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Liminix on this device uses the UBI volume management system to perform
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wear leveling on the flash. This is not set up from the factory, so a
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one-time step is needed to prepare it before Liminix can be installed.
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==== Preparation
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To prepare the device for Liminix you first need to use the
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https://github.com/dangowrt/owrt-ubi-installer[OpenWrt UBI Installer]
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image to rewrite the flash layout. As of Jan 2025 there are two versions
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of the installer available: the release version 1.0.2 and the
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pre-release 1.1.3 and for Liminix you nee the pre-release. The release
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version of the installer creates UBI volumes according to an older
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layout that is not compatible with the Linux 6.6.67 kernel used in
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Liminix.
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You can run the installer in one of two ways: either follow the
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instructions to do it through the vendor web interface, or you can drop
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to U-Boot and use TFTP
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[source,console]
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----
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MT7622> setenv ipaddr 10.0.0.6
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MT7622> setenv serverip 10.0.0.1
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MT7622> tftpboot 0x42000000 openwrt-mediatek-mt7622-linksys_e8450-ubi-initramfs-recovery-installer.itb
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MT7622> bootm 0x42000000
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----
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This will write the new flash layout and then boot into a "recovery"
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OpenWrt installation.
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==== Building/installing Liminix
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The default target for this device is `+outputs.ubimage+` which makes a
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ubifs image suitable for use with `+ubiupdatevol+`. To write this to the
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device we use the OpenWrt recovery system installed in the previous
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step. In this configuration the device assigns itself the IP address
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192.168.1.1/24 on its LAN ports and expects the connected computer to
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have 192.168.1.254
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[WARNING]
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====
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The [.title-ref]#ubi0_7# device in these instructions is correct as of
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Dec 2024 (dangowrt/owrt-ubi-installer commit d79e7928). If you are
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installing some time later, it is important to check the output from
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`+ubinfo -a+` and make sure you are updating the "liminix" volume and
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not some other one which had been introduced since I wrote this.
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====
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[source,console]
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----
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$ nix-build -I liminix-config=./my-configuration.nix --arg device "import ./devices/belkin-rt3200" -A outputs.default
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$ cat result/rootfs | ssh root@192.168.1.1 "cat > /tmp/rootfs"
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$ ssh root@192.168.1.1
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root@OpenWrt:~# ubimkvol /dev/ubi0 --name=liminix --maxavsize
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root@OpenWrt:~# ubinfo -a
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[...]
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Volume ID: 7 (on ubi0)
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Type: dynamic
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Alignment: 1
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Size: 851 LEBs (108056576 bytes, 103.0 MiB)
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State: OK
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Name: liminix
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Character device major/minor: 250:8
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root@OpenWrt:~# ubiupdatevol /dev/ubi0_7 /tmp/rootfs
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----
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To make the new system bootable we also need to change some U-Boot
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variables. `+boot_production+` needs to mount the filesystem and boot
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the FIT image found there, and `+bootcmd+` needs to be told not to boot
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the rescue image if there are records in pstore, because that interferes
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with `+config.log.persistent+`
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[source,console]
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----
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root@OpenWrt:~# fw_setenv orig_boot_production $(fw_printenv -n boot_production)
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root@OpenWrt:~# fw_setenv orig_bootcmd $(fw_printenv -n bootcmd)
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root@OpenWrt:~# fw_setenv boot_production 'led $bootled_pwr on ; ubifsmount ubi0:liminix && ubifsload ''${loadaddr} boot/fit && bootm ''${loadaddr}'
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root@OpenWrt:~# fw_setenv bootcmd 'run boot_ubi'
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----
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For subsequent Liminix reinstalls, just run the `+ubiupdatevol+` command
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again. You don't need to repeat the "Preparation" step and in fact
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should seek to avoid it if possible, as it will reset the erase counters
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used for write levelling. Using UBI-aware tools is therefore preferred
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over any kind of "factory" wipe which will reset them.
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'';
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system = {
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crossSystem = {
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config = "aarch64-unknown-linux-musl";
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};
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};
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module =
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{
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pkgs,
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config,
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lib,
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lim,
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...
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}:
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let
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inherit (lib) mkIf;
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firmware = pkgs.stdenv.mkDerivation {
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name = "wlan-firmware";
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phases = [ "installPhase" ];
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installPhase = ''
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mkdir $out
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cp ${pkgs.linux-firmware}/lib/firmware/mediatek/{mt7915,mt7615,mt7622}* $out
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'';
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};
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openwrt = pkgs.openwrt_24_10;
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in
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{
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imports = [
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../../modules/arch/aarch64.nix
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../../modules/outputs/tftpboot.nix
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../../modules/outputs/ubifs.nix
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];
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config = {
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kernel = {
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extraPatchPhase = ''
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${openwrt.applyPatches.mediatek}
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'';
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src = openwrt.kernelSrc;
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version = openwrt.kernelVersion;
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config = {
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PCI = "y";
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ARCH_MEDIATEK = "y";
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# ARM_MEDIATEK_CPUFREQ = "y";
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# needed for "Cannot find regmap for /infracfg@10000000"
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MFD_SYSCON = "y";
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MTK_INFRACFG = "y";
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MTK_PMIC_WRAP = "y";
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DMADEVICES = "y";
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MTK_HSDMA = "y";
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MTK_SCPSYS = "y";
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MTK_SCPSYS_PM_DOMAINS = "y";
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# MTK_THERMAL="y";
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MTK_TIMER = "y";
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COMMON_CLK_MT7622 = "y";
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COMMON_CLK_MT7622_ETHSYS = "y";
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COMMON_CLK_MT7622_HIFSYS = "y";
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COMMON_CLK_MT7622_AUDSYS = "y";
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PM_CLK = "y";
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REGMAP_MMIO = "y";
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CLKSRC_MMIO = "y";
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REGMAP = "y";
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MEDIATEK_GE_PHY = "y";
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# MEDIATEK_MT6577_AUXADC = "y";
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NET_MEDIATEK_SOC = "y";
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NET_MEDIATEK_SOC_WED = "y";
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NET_MEDIATEK_STAR_EMAC = "y"; # this enables REGMAP_MMIO
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NET_VENDOR_MEDIATEK = "y";
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PCIE_MEDIATEK = "y";
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BLOCK = "y"; # move this to base option
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SPI_MASTER = "y";
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SPI = "y";
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SPI_MEM = "y";
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SPI_MTK_NOR = "y";
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SPI_MTK_SNFI = "y";
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MTD = "y";
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MTD_BLOCK = "y";
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MTD_RAW_NAND = "y";
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MTD_NAND_MTK = "y";
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MTD_NAND_MTK_BMT = "y"; # Bad-block Management Table
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MTD_NAND_ECC_MEDIATEK = "y";
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MTD_NAND_ECC_SW_HAMMING = "y";
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MTD_SPI_NAND = "y";
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MTD_OF_PARTS = "y";
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MTD_NAND_CORE = "y";
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MTD_SPI_NOR = "y";
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MTD_SPLIT_FIRMWARE = "y";
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MTD_SPLIT_FIT_FW = "y";
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MTD_UBI_NVMEM = "y";
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NVMEM_MTK_EFUSE = "y";
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NVMEM_BLOCK = "y";
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NVMEM_LAYOUT_ADTRAN = "y";
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MMC = "y";
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MMC_BLOCK = "y";
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MMC_CQHCI = "y";
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MMC_MTK = "y";
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# Distributed Switch Architecture is needed
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# to make the ethernet ports visible
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NET_DSA = "y";
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NET_DSA_MT7530 = "y";
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NET_DSA_TAG_MTK = "y";
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NET_DSA_MT7530_MDIO = "y";
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SERIAL_8250 = "y";
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SERIAL_8250_CONSOLE = "y";
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SERIAL_8250_MT6577 = "y";
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# SERIAL_8250_NR_UARTS="3";
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# SERIAL_8250_RUNTIME_UARTS="3";
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SERIAL_OF_PLATFORM = "y";
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# Must enble hardware watchdog drivers. Else the device reboots after several seconds
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WATCHDOG = "y";
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MEDIATEK_WATCHDOG = "y";
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};
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conditionalConfig = {
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WLAN = {
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MT7615E = "m";
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MT7622_WMAC = "y";
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MT7915E = "m";
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};
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};
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};
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boot = {
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commandLine = [ "console=ttyS0,115200" ];
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tftp.loadAddress = lim.parseInt "0x48000000";
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imageFormat = "fit";
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loader.fit.enable = lib.mkDefault true; # override this if you are building tftpboot
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};
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rootfsType = lib.mkDefault "ubifs"; # override this if you are building tftpboot
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filesystem =
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let
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inherit (pkgs.pseudofile) dir symlink;
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in
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dir {
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lib = dir {
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firmware = dir {
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mediatek = symlink firmware;
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};
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};
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};
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hardware =
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let
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mac80211 = pkgs.kmodloader.override {
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targets = [
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"mt7615e"
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"mt7915e"
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];
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inherit (config.system.outputs) kernel;
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};
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in
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{
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ubi = {
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minIOSize = "2048";
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logicalEraseBlockSize = "126976";
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physicalEraseBlockSize = "131072";
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maxLEBcount = "1024"; # guessing
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};
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defaultOutput = "ubimage";
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# the kernel expects this to be on a 2MB boundary. U-Boot
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# (I don't know why) has a default of 0x41080000, which isn't.
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# We put it at the 32MB mark so that tftpboot can put its rootfs
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# image and DTB underneath, but maybe this is a terrible waste of
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# RAM unless the kernel is able to reuse it later. Oh well
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loadAddress = lim.parseInt "0x42000000";
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entryPoint = lim.parseInt "0x42000000";
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rootDevice = "ubi0:liminix";
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dts = {
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src = "${openwrt.src}/target/linux/mediatek/dts/mt7622-linksys-e8450-ubi.dts";
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includePaths = [
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"${openwrt.src}/target/linux/mediatek/dts"
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"${config.system.outputs.kernel.modulesupport}/arch/arm64/boot/dts/mediatek/"
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];
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includes = mkIf config.logging.persistent.enable [
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./pstore-pmsg.dtsi
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];
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};
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# - 0x000000000000-0x000008000000 : "spi-nand0"
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# - 0x000000000000-0x000000080000 : "bl2"
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# - 0x000000080000-0x0000001c0000 : "fip"
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# - 0x0000001c0000-0x0000002c0000 : "factory"
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# - 0x0000002c0000-0x000000300000 : "reserved"
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# - 0x000000300000-0x000008000000 : "ubi"
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networkInterfaces =
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let
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inherit (config.system.service.network) link;
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in
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rec {
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wan = link.build { ifname = "wan"; };
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lan1 = link.build { ifname = "lan1"; };
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lan2 = link.build { ifname = "lan2"; };
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lan3 = link.build { ifname = "lan3"; };
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lan4 = link.build { ifname = "lan4"; };
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lan = lan3;
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wlan = link.build {
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ifname = "wlan0";
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dependencies = [ mac80211 ];
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};
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wlan5 = link.build {
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ifname = "wlan1";
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dependencies = [ mac80211 ];
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};
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};
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};
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};
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};
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}
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