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

Other output:

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