Coreboot panic room. Diagnostics (also remote flashing)

by Tadas Slotkus for coreboot

To help developing coreboot code, we have to set-up remote diagnostics (also flashing) interface in coreboot. We will be a able to renew bricked board through serial port or even do some research through registers in case of panic(). This will enable easier development of CAR, chipset, payloads code.