mediatek: filogic: add support for SNR-CPE-AX2

mediatek: filogic: add support for SNR-CPE-AX2

SOC: MediaTek MT7981b
RAM: 256MB DDR3
FLASH: 128MB SPI-NAND (Winbond W25N01GV)
WIFI: Mediatek MT7981b DBDC 802.11ax 2.4/5 GHz
ETH: MediaTek MT7531 Switch
UART: 3V3 115200 8N1 (Pinout silkscreened / Do not connect VCC)

Interface	MAC	Algorithm
LAN	8C:AE:DB:2C:xx:xx	label
WAN	8C:AE:DB:2C:xx:xx	label +1
WLAN 2.4G	8C:AE:DB:2C:xx:xx	label +2
WLAN 5G	8C:AE:DB:2C:xx:xx	label +3
Installation
-------------------Install openwrt image-------------------------------:

Set a static ip on the ethernet interface of your PC. (ip address:
192.168.1.254, subnet mask:255.255.255.0) .

Download the OpenWrt uboot image
(openwrt-mediatek-filogic-snr_cpe-ax2-bl31-uboot.fip).

SSH/SCP opened by default on the stock firmware (3.0.1).
Username: Admin, default password: Admin. Check it on the bottom of
the router.

Copy uboot image using SCP (WinSCP) to /tmp dir on SNR-CPE-AX2.

Download recovery file.
openwrt-mediatek-filogic-snr_snr-cpe-ax2-initramfs-recovery.itb.

Copy the recovery image to a TFTP server reachable at 192.168.1.254/24.

Open ssh shell to the SNR-CPE-AX2.
Run commands:
mtd write \
/tmp/openwrt-mediatek-filogic-snr_snr-cpe-ax2-bl31-uboot.fip FIP
reboot

Wait until recovery boot.
Open web 192.168.1.1 and do sysupgrade by
openwrt-mediatek-filogic-snr_cpe-ax2-squashfs-sysupgrade.itb

Signed-off-by: Nikolay March <palladin82@yandex.ru>
Link: https://github.com/openwrt/openwrt/pull/18700
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>