AMD SB600 Specifications download pdf (Page 56)

2008 Advanced Micro Devices Inc.

Sample Programs

AMD SB600 BIOS Developer’s Guide (Public Version) Proprietary

Page 56

cmp al, 0Ch ; Max index in 9 to 0Ch series

jbe ClearPciIrq9ToC

pop dx ; Restore the registers

pop ax

ret

PciIrqInit endp

14.2 Setup Options

14.2.1 64 Bytes DMA

If 64 bytes DMA is selected for P2P bridge, set PCI to PCI bridge device 14h, function 4, register

4Bh, bit 4 to 1.

14.2.2 USB Overcurrent Detection Disable

To disable over-current detection for both OHCI and EHCI USB devices, set USB device 13h,

function 0 register 51h, bit 0,

Sample Program

UsbOverCurrentDetectionDisable proc near

push eax ; Save registers used by this device

push dx

mov dx,0CF8h ; PCI configuration space index register

mov eax,8000A850h ; Device 13h, function 0, register 50h-53h

out dx,eax

mov dx,0CFDh ; PCI configuration space. Access reg. 51h

in dx,al ; Read current value

or al,01h ; Set to disable USB OHCI and EHCI overcurrent

out dx,al

pop dx ; Restore registers used by this routine

pop eax ;

ret

UsbOverCurrentDetectionDisable endp

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AMD SB600 Specifications Page 56