[coreboot] EHCI Debug port support?

Hi:
I reviewed the source code of coreboot-v2-4671.
I found the EHCI debug port source code at " src\lib" && "src\console"
dirs.
So, that means:
I plugged a USB-2-Serial device into the usb port on the target
platform,
then, I used a serial line connected to the host's COM port,
then, I could see the debug messages output from the target platform?

Best wishes,