I don't know about the UARTs; but do a grep for "7200" in your source tree, and you will probably find that the 7200 is catered for.
No results returned when I search for the string "7200" in the source code.
First I must say that right now I'm only interested on running Linux OS in my router, the original OS was ZynOS (vxworks based?). Probably for installing Openwrt with a bare system since the flash is only 2 MB size. I just want to have this device with Linux to play with GPIOs, I have schematics of the board and I can locate them easily.
The bootloader 188.8.131.52 for the Acorp W422G works in my router, well mostly. The switch doesn't work, it turns out that the reset# pin at the SoC is tied to GPIO5, and pulled down by default. To pull it out of reset I must set GPIO5 in high state, and the better way is put a bit of code in the PSP sourcecode.
Of course I can also flash the firmware via JTAG, terribly slow, or put a pullup resistor on the RST# at the switch, but it would be nice having a working bootloader with ethernet connectivity without additional mods.
BTW this is more for learning about embedded systems than installing RouterTech or recovering the router. I have plenty of routers more powerful than this one. But I wanted to play a bit with AR7 devices, and this router brought me a good opporunity.
I will take another look at the sourcecode, might be there is some magic bit somewhere for making the bootloader work.