I believe the two images listed for a Buffalo WZR-HP-G300NH, the one with -rb and the one with -s, are backwards. My Buffalo says A0 D0 on the back so I did a sysupgrade with the -rb image after reading your page about this router. I now get error messages:
[ 4.643112] rtl8366rb switch: cannot find mdio node phandle
[ 4.648840] rtl8366rb switch: using GPIO pins 531 (SDA) and 532 (SCK)
[ 4.655401] rtl8366rb switch: unknown chip id (0000)
[ 4.660423] rtl8366rb switch: chip detection failed, err=-19
and
Failed to connect to the switch. Use the "list" command to see which switches are available.
Failed to connect to the switch. Use the "list" command to see which switches are available.
Failed to connect to the switch. Use the "list" command to see which switches are available.
Failed to connect to the switch. Use the "list" command to see which switches are available.
I can log in over wifi and a serial port shows the boot log, but I have not connection on the RJ45 plugs on the back.
I think I recall (14 years ago) configuring something with an 8366s switch.