Bitfields for PCI Configuration Built-In Self-Test register:
Bit(s)	Description	)
 3-0	completion code (0000 = successful)
 5-4	reserved
 6	start BIST (set to one to start, cleared automatically on completion)
 7	BIST-capable
Notes:	this register is hardwired to 00h if no BIST capability
	software should timeout the BIST after two seconds
SeeAlso: #00878