Building:
	Configure support

Serial:
	Baudrate support

IDE:
	Support multiple drive
	ATAPI CD-ROM boot

BIOS function:
	version
	reset/shutdown
	delay
	RTC handling
	Flash memory handling ---> Return free area start
				   write/erase can be done with MTD driver
	LED handling
	LED heartbeat

	Distinguish manual reset, hardware reset, exception
