ramips: add support for Xiaomi Mi Router 4AC (100M Edition)

[Adrian Schmutzler]

> -----Original Message-----
> From: openwrt-devel [mailto:openwrt-devel-bounces at lists.openwrt.org]
> On Behalf Of Sorin Pop
> Sent: Sonntag, 6. Dezember 2020 00:54
> To: openwrt-devel at lists.openwrt.org
> Subject: ramips: add support for Xiaomi Mi Router 4AC (100M Edition)
> 
> - SoC:      MediaTek MT7628AN
> - Flash:    16MB (Winbond W25Q128JV)
> - RAM:      64MB
> - Serial:   As marked on PCB, 3V3 logic, baudrate is 115200
> - Ethernet: 3x 10/100 Mbps (switched, 2x LAN + WAN)
> - WIFI0:    MT7628AN 2.4GHz 802.11b/g/n
> - WIFI1:    MT7612EN 5GHz 802.11ac
> - Antennas: 4x external (2 per radio), non-detachable
> - LEDs:     Programmable power-LED (two-colored, yellow/blue)
>             Non-programmable internet-LED (shows WAN-activity)
> - Buttons:  Reset

So, the only difference in implementation is the size of overlay/firmware partitions?

Best

Adrian

> 
> INSTALLATION:
> 
> 1. Connect to the serial port of the router and power it up.
>    If you get a prompt asking for boot-mode, go to step 3.
> 2. Unplug the router after
>        > Erasing SPI Flash...
>        > raspi_erase: offs:20000 len:10000
>    occurs on the serial port. Plug the router back in.
> 3. At the prompt select option 2 (Load system code then
>    write to Flash via TFTP.)
> 4. Enter 192.168.1.1 as the device IP and 192.168.1.2 as the
>    Server-IP.
> 5. Connect your computer to LAN1 and assign it as 192.168.1.2/24.
> 6. Serve the sysupgrade image via TFTP
> 
> This router seems to have the same hardware as Xiaomi Mi Router 4A (100M
> Edition) but it uses a different U-Boot.
> 
> Signed-off-by: Sorin Pop <alexsorinpop at gmail.com>
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