mediatek: add support for GL.iNet GL-MT2500
Hardware
--------
SoC: MediaTek MT7981BA
RAM: 1GB DDR4 (NANYA NT5AD512M16C4-JR)
MMC: 8GB eMMC (Samsung 8GTF4R)
ETH: 1000Base-T LAN (ePHY)
2500Base-T WAN (MaxLinear GPY211C)
BTN: 1x Reset Button
LED: System (blue/white)
VPN (white)
USB: 1x USB-A (USB 3.0)
UART: 115200 8N1 - Pinout on board next to LAN port
Don't connect 3.3V!
Known Issues
------------
U-Boot vendor recovery does not seem to accept any images, neither
GL.iNet images nor OpenWrt images. Recovery requires serial access!
Installation
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Upload the OpenWrt sysupgrade image to the Gl.iNet Web-UI. Make sure to
not retain existing settings.
Signed-off-by: David Bauer <mail@david-bauer.net>