AMD SB600 Specifications download pdf (Page 59)

2008 Advanced Micro Devices Inc.

Sample Programs

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

Page 59

2. Write to the same SATA device registers (9h, 0Ah, 0Bh) with the class ID.

3. Disable header write: Clear the SATA device register 40h, bit 0 to 0.

Sample Program:

This sample program will set SATA-1, Bus 0, Device 12h, Function 0 to class code for IDE class

01018Fh.

SataClassIdSampleProgram proc near

push eax ; Save registers used by this routine

push dx

; Enable header write. Set register 40h, bit 0 to 1

mov dx,0CF8h ; To access PCI configuration space

mov eax, 80009040h ; SATA-1, Bus 0, Device 12h, Function 0, reg 40h

out dx,eax

mov dx,CFCh ; To access register 40h

in al,dx ; Current register 40h value

or al,01h

out dx,al

; Write class code. Register 08 is read only and will not be modified

mov dx,0CF8h ; To access PCI configuration space

mov eax,80009008h ; Bus 0, Device 12h, Function 0 , register 08h

out dx,eax

mov dx,0CFCh ; To access dword at starting at register 08h

mov eax,01018F00h ; Reg 08 is read only. Reg 9-0b will be written

out dx,eax

; Disable header write. Clear register 40h, bit 0 to 0

mov dx,0CF8h ; To access PCI configuration space

mov eax, 80009040h ; SATA-1, Bus 0, Device 12h, Function 0, reg 40h

out dx,eax

mov dx,0CFCh ; To access register 40h

in al,dx ; Current register 40h value

and al,0FEh

out dx,al

pop dx ; Restore registers used by this routine

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AMD SB600 Specifications Page 59