Console and outputs

Coreboot has various possible consoles:

Output name	direction (from the target coreboot machine point of view)	software compatibility (compatibility with software loaded after coreboot, like OS payloads etc...)
Serial console	input output	seabios grub as a payload grub running after seabios libpayload linux kernel (loaded after the payload) most GNU/Linux init systems(sysvinit, systemd, upstart etc...)
Console Over EHCI debug port	input? output
Console trough spkmodem	output only
Network console	output
Cbmem console	output only	grub with the cbmemc command coreboot's userspace cbmem -c uttility

Other output:

• POST Card
• Tracing the Flash chip's access?