Chapter 7
Recommended BIOS Settings
247
24081D—February 2002
AMD-761™ System Controller Software/BIOS Design Guide
Preliminary Information
Registers
-----
Bits
Description
Initialized/
Required
Value
Actual
Value
Key
fcn( )
Notes
0x1x0x00h
PCI ID
31:16
Device ID
700Fh
r
AMD-761™ system
controller
15:0
Vendor ID
1022h
r
AMD
0x1x0x04h
PCI Command and Status
31
PERR_Rcv
0b
r
Not supported
30
SERR Sent
yb
u
R/W/1C, from AMD-761
system controller
29
Master ABRT
0b
r
R/W/1C, from bus master
28
Target ABRT
0b
r
R/W/1C, from bus master target
27
Target ABRTS Signaled
0b
r
Not supported
26:25
DEVSEL_Timing
01b
r
24
Data_PERR
0b
r
23
FastB2B
0b
r
22
UDF
0b
r
21
66M
1b
r
Support 66 MHz on device 1
20
Cap_Lst
0b
r
19:10
Reserved
00b 00h
r
9
FBACK
0b
8
SERR, System Error Enable
yb
u
0 = Disable, 1 = Enable
7
Step
0b
r
6
PERR
0b
r
5
VGA Palette Snoop
0b
r
4
MWINV
0b
r
3
SCYC
0b
r
2
MSTR
1b
B
DMA enabled on APCI
1
MEM
1b
B
Memory access enable on APCI
0
IO
1b
B
IO access Enabled on APCI
0x1x0x08h
PCI Rev ID and Class Code
31:24
Class Code
06h
r
Bridge device
23:16
Sub_Class Code
04h
r
Host/PCI bridge
15:8
Prog. I/F
00h
r
Host/PCI bridge
7:0
Revision ID
00h
r
KEY:
B= Mandatory BIOS function
A= AGP setup by BIOS
c = Calculated/set by AMD-761™ internal logic
P= Power management setup by BIOS
o = Setup by OS or OS driver
F = Performance enhancement set by BIOS
r = Hardcoded and reserved
u = PCI operational user interface
E = Elective BIOS function