Netgear R6220/Serial info

Firmware
Firmware image "R6220-V1.0.0.8_1.0.1.img" downloaded
 * from FTP contains a bootloader for MT7621.

Uncompressed size of the image is 50MB, so at least
 * 64MB NAND flash are likely to be present.

Wireless driver module is listed as rlt_wifi.ko