[U-Boot-Users] POST on new architecture?

We were looking at adding POST support to our platform, and was digging into POST/ether.c (which seems to be specific for Serial Communication Controllers (SCC).

I was wondering if it would be better to add the loopback control into the specific ethernet driver? in ./drivers?

Or what way would you prefer to add testing of other architectures ethernet / uart / usb peripherals?

Thanks -Robin