Specifications

2008 Advanced Micro Devices Inc.

Sample Programs

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

Page 58

pop dx ; Restore registers

pop eax

ret

EnableSubtractiveDecoding endp

14.2.5 Enable/Disable On-Chip SATA

SATA may be disabled/enabled by Miscellaneous SATA register located at bus 0, device 14h,

function 0, register ADh. Bit 0 of this register, when set to 1, enables SATA.

Sample Program:

This sample program will enable SATA

EnableDisableSataSampleProgram proc near

push eax ; Save registers used by this routine

push dx

mov dx,0CF8h ; To access PCI configuration space

mov eax,8000A0ACh ; Register ACh to AFh of device 14h, function 0

out dx,eax

mov dx,0CFDh ; To access register 0ADh

in al,dx ; Read current value

or al,01h ; Set bit 0 to enable SATA

out dx,al ; Write the byte back

pop dx

pop eax

ret

EnableDisableSataSampleProgram endp

14.2.6 Change Class ID for SATA

The SATA device may have multiple PCI class codes. Some of the class codes are as follows::

Class Base Class Code

SubClass Code

Programming Interface

IDE Class 01h 01h 8Fh

AHCI Class 01h 06h 01h

Raid Class 01h 04h 00h

To change the class ID for the SATA*:

1. Enable header write: Set the SATA PCI Bus 0, Device 12h, Function 0 (for SATA), register

40h, bit 0 to 1.