Intel® 865G/865GV Chipset Datasheet - download.intel.nl - Intel

Register Description3.7.9 HDR2—Header Type Register (Device 2)Address Offset:Default Value:Access:Size:0Eh00hRO8 bitsThis register contains the Header Type of the IGD.Bit7:0DescriptionHeader Code (H)—RO. This is an 8-bit value that indicates the Header Code for the IGD.00h = Single function device with a type 0 configuration space format.3.7.10 GMADR—Graphics Memory Range Address Register(Device 2)Address Offset: 10–13hDefault Value: 00000008hAccess:R/W, ROSize:32 bitsThis register requests allocation for the IGD graphics memory. The allocation is for 128 MB andthe base address is defined by bits [31:27].BitDescription31:27 Memory Base Address⎯R/W. Set by the OS, these bits correspond to address signals [31:26].26 128MB Address Mask—RO. Hardwired to 0 to indicate 128-MB address space.25:4 Address Mask—RO. Hardwired to 0s to indicate (at least) a 32-MB address range.3 Prefetchable Memory—RO. Hardwired to 1 to enable prefetching.2:1 Memory Type—RO. Hardwired to 00 to indicate 32-bit address.0 Memory/IO Space—RO. Hardwired to 0 to indicate memory space.106 Intel ® 82865G/82865GV GMCH Datasheet