ramips: add support for MeiG SLT866 4G CPE
Hardware:
- SoC: Mediatek MT7621 (MT7621AT)
- Flash: 32 MiB SPI-NOR (Macronix MX25L25635E)
- RAM: 128 MiB
- Ethernet: Built-in, 2 x 1GbE
- 3G/4G Modem: MEIG SLM828 (currently only supported with ModemManager)
- SLIC: Si32185 (unsupported)
- Power: 12V via barrel connector
- Wifi 2.4GHz: Mediatek MT7603BE 802.11b/g/b
- Wifi 5GHz: Mediatek MT7613BE 802.11ac/n/a
- LEDs: 8x (7 controllable)
- Buttons: 2x (RESET, WPS)
Installing OpenWrt:
- sysupgrade image is compatible with vendor firmware.
Recovery:
- Connect to any of the Ethernet ports, configure local IP:
10.10.10.3/24 (or 192.168.10.19/24, depending on OEM)
- Provide firmware file named 'mt7621.img' on TFTP server.
- Hold down both, RESET and WPS, then power on the board.
- Watch network traffic using tcpdump or wireshark in realtime to
observe progress of device requesting firmware. Once download has
completed, release both buttons and wait until firmware comes up.
Signed-off-by: Daniel Golle <daniel@makrotopia.org>