forked from dan/liminix
Daniel Barlow
3af9e86624
the default is to boot to recovery if there's anything in pstore, but this doesn't interact well with persstent logging
304 lines
10 KiB
Nix
304 lines
10 KiB
Nix
{
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description = ''
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Belkin RT-3200 / Linksys E8450
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******************************
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This device is based on a 64 bit Mediatek MT7622 ARM platform,
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and is mostly feature-complete in Liminix but as of Dec 2024
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has seen very little actual use.
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.. note:: The factory flash image contains ECC errors that make it
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incompatible with Liminix: use the `OpenWrt
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UBI Installer <https://github.com/dangowrt/owrt-ubi-installer>`_ to
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rewrite the partition layout before you can use
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Liminix with it
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Hardware summary
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================
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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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============
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Liminix on this device uses the UBI volume management system to
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perform wear leveling on the flash. This is not set up from the
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factory, so a one-time step is needed to prepare it before Liminix
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can be installed.
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Preparation
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-----------
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To prepare the device for Liminix you first need to use the
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`OpenWrt UBI Installer
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<https://github.com/dangowrt/owrt-ubi-installer>`_ image to
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rewrite the flash layout. You can do this in one of two ways:
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either follow the instructions to do it through the vendor web
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interface, or you can drop to U-boot and use TFTP
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.. code-block:: console
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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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This will write the new flash layout and then boot into a
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"recovery" OpenWrt installation.
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Building/installing Liminix
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----------------
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The default target for this device is ``outputs.ubimage`` which
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makes a ubifs image suitable for use with :command:`ubiupdatevol`.
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To write this to the device we use the OpenWrt recovery system
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installed in the previous step. In this configuration the
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device assigns itself the IP address 192.168.1.1/24 on its LAN
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ports and expects the connected computer to have 192.168.1.254
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.. warning:: The `ubi0_7` device in these instructions is correct
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as of Dec 2024 (dangowrt/owrt-ubi-installer commit
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d79e7928). If you are installing some time later, it
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is important to check the output from
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:command:`ubinfo -a` and make sure you are updating
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the "liminix" volume and not some other one which had
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been introduced since I wrote this.
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.. code-block:: console
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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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To make the new system bootable we also need to change some U-Boot variables.
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``boot_production`` needs to mount the filesystem and boot the FIT image
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found there, and :code:`bootcmd` needs to be told _not_ to boot the rescue
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image if there are records in pstore, because that interferes with
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``config.log.persistent``
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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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For subsequent Liminix reinstalls, just run the
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:command:`ubiupdatevol` command again. You don't need to repeat
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the "Preparation" step and in fact should seek to avoid it if
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possible, as it will reset the erase counters used for write
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levelling. Using UBI-aware tools is therefore preferred over any
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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 = {pkgs, config, lib, lim, ... }:
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let 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}* $out
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'';
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};
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in {
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imports = [
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../../modules/arch/aarch64.nix
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../../modules/outputs/tftpboot.nix
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../../modules/outputs/ubifs.nix
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];
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config = {
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kernel = {
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extraPatchPhase = ''
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${pkgs.openwrt.applyPatches.mediatek}
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'';
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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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NVMEM_MTK_EFUSE="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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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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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 "0x4007ff28";
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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 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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openwrt = pkgs.openwrt;
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mac80211 = pkgs.kmodloader.override {
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targets = ["mt7615e" "mt7915e"];
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inherit (config.system.outputs) kernel;
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};
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in {
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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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};
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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 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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