openwrt/target/linux/ramips/dts/mt7621_xiaomi_mi-router-4a-common.dtsi
Dmitry Sokolov 39e4f03fd3 ramips: mt7621: add support for Xiaomi Mi Router 4A Gigabit v2
Device is the same as Xiaomi Mi Router 4A Gigabit, except of:
- 5G WiFi is MT7663
- addresses of leds, wifi and eth ports are slightly changed

Specs:
  SoC:  MT7621
  CPU:  2 x 880 MHz
  ROM:  16 MB
  RAM:  128 MB
  WLAN: MT7603, MT7663

MAC addresses:
  WAN     ****  factory 0xe006 (label)
  LAN     *:f7  factory 0xe000
  2.4 GHz *:f8  factory 0x0000+0x4 (mtd-eeprom+0x4)
  5 GHz   *:f9  factory 0x8000+0x4 (mtd-eeprom+0x4)

Installation:

Factory firmware is based on a custom OpenWrt 17.x.
Installation is the same as for Xiaomi Mi Router 4A Gigabit.

Probably the easiest way to install is to use the script from
this repository: https://github.com/acecilia/OpenWRTInvasion/pull/155

In a more advanced case, you can do everything yourself:
- gain access to the device through one of the exploits described
  in the link above
- upload sysupgrade image to /tmp
- overwrite stock firmware:
  # mtd -e OS1 -r write /tmp/sysupgrade.bin OS1

Recovery:

Recovery procedure is the same as for Xiaomi Mi Router 4A Gigabit.
Possible options can be found here:
https://openwrt.org/inbox/toh/xiaomi/xiaomi_mi_router_4a_gigabit_edition

One of the ways is to use another router with OpenWrt:
- connect both routers by their LAN ports
- download stock firmware from [1]
- place it inside /tmp/test.bin on the main router
- configure PXE/TFTP on the main router
- power off 4Av2, hold Reset button, power on
- as soon as image download via TFTP starts, Reset can be released
- blinking blue wan LED will indicate the end of the flashing process,
  now router can be rebooted
[1] http://cdn.cnbj1.fds.api.mi-img.com/xiaoqiang/rom/r4av2/miwifi_r4av2_firmware_release_2.30.28.bin

Signed-off-by: Dmitry Sokolov <e323w@proton.me>
2023-01-28 22:11:44 +01:00

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// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
#include "mt7621.dtsi"
#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/input/input.h>
/ {
aliases {
led-boot = &led_status_yellow;
led-failsafe = &led_status_yellow;
led-running = &led_status_blue;
led-upgrade = &led_status_yellow;
};
chosen {
bootargs = "console=ttyS0,115200n8";
};
keys {
compatible = "gpio-keys";
reset {
label = "reset";
gpios = <&gpio 18 GPIO_ACTIVE_LOW>;
linux,code = <KEY_RESTART>;
};
};
};
&spi0 {
status = "okay";
flash@0 {
compatible = "jedec,spi-nor";
reg = <0>;
spi-max-frequency = <50000000>;
m25p,fast-read;
partitions: partitions {
compatible = "fixed-partitions";
#address-cells = <1>;
#size-cells = <1>;
partition@0 {
label = "u-boot";
reg = <0x0 0x30000>;
read-only;
};
partition@30000 {
label = "u-boot-env";
reg = <0x30000 0x10000>;
read-only;
};
partition@40000 {
label = "Bdata";
reg = <0x40000 0x10000>;
read-only;
};
factory: partition@50000 {
label = "factory";
reg = <0x50000 0x10000>;
read-only;
};
partition@60000 {
label = "crash";
reg = <0x60000 0x10000>;
read-only;
};
partition@70000 {
label = "cfg_bak";
reg = <0x70000 0x10000>;
read-only;
};
partition@80000 {
label = "overlay";
reg = <0x80000 0x100000>;
read-only;
};
firmware: partition@180000 {
compatible = "denx,uimage";
label = "firmware";
reg = <0x180000 0xe80000>;
};
};
};
};
&pcie {
status = "okay";
};
&pcie0 {
wifi0: wifi@0,0 {
compatible = "mediatek,mt76";
reg = <0x0000 0 0 0 0>;
};
};
&pcie1 {
wifi1: wifi@0,0 {
compatible = "mediatek,mt76";
reg = <0x0000 0 0 0 0>;
};
};
&gmac0 {
nvmem-cells = <&macaddr_factory_e000>;
nvmem-cell-names = "mac-address";
};
&state_default {
gpio {
groups = "jtag", "uart2", "uart3", "wdt";
function = "gpio";
};
};
&factory {
compatible = "nvmem-cells";
#address-cells = <1>;
#size-cells = <1>;
macaddr_factory_e000: macaddr@e000 {
reg = <0xe000 0x6>;
};
macaddr_factory_e006: macaddr@e006 {
reg = <0xe006 0x6>;
};
};