Intel G645 BX80623G645 User Manual

58

Datasheet, Volume 2

2

RO

0h

1

RW-L

0b

Uncore

IGD VGA Disable (IVD)
0 = Enable. Device 2 (IGD) claims VGA memory and I/O cycles, 

the Sub-Class Code within Device 2 Class Code register is 00.

1 = Disable. Device 2 (IGD) does not claim VGA cycles (Memory 

and I/O), and the Sub- Class Code field within Device 2 

function 0 Class Code register is 80h.

BIOS Requirement: BIOS must not set this bit to 0 if the GMS 

field (bits 7:3 of this register) pre-allocates no memory.
This bit MUST be set to 1 if Device 2 is disabled using a register 

(DEVEN[3] = 0).
This register is locked by Intel TXT lock.

0

RW-KL

0b

Uncore

GGC Lock (GGCLCK)
When set to 1b, this bit will lock all bits in this register.