Intel 6 SERIES CHIPSET - DATASHEET 01-2011 Datasheet page 567

SATA Controller Registers (D31:F2)
14.1.30 MAP—Address Map Register (SATA–D31:F2)
Address Offset: 90h
Default Value:
Function Level Reset: No (Bits 7:5 and 13:8 only)
Bits
15:8
7:6
5
4:0
Datasheet
0000h
Reserved
SATA Mode Select (SMS) — R/W. Software programs these bits to control the mode
in which the SATA Controller should operate:
00b = IDE mode
01b = AHCI mode
10b = RAID mode
11b = Reserved
NOTES:
1. The SATA Function Device ID will change based on the value of this register.
2. When switching from AHCI or RAID mode to IDE mode, a 2 port SATA controller
(Device 31, Function 5) will be enabled.
3. SW shall not manipulate SMS during runtime operation; that is. the OS will not
do this. The BIOS may choose to switch from one mode to another during POST.
4. Not all register values may be available for a given SKU. See
details on storage controller capabilities.
These bits are not reset by Function Level Reset.
SATA Port-to-Controller Configuration (SC) — R/W. This bit changes the number of
SATA ports available within each SATA Controller.
0 = Up to 4 SATA ports are available for Controller 1 (Device 31 Function 2) with ports
[3:0] and up to 2 SATA ports are available for Controller 2 (Device 31 Function 5)
with ports [5:4].
1 = Up to 6 SATA ports are available for Controller 1 (Device 31 Function 2) with ports
[5:0] and no SATA ports are available for Controller 2 (Device 31 Function 5).
NOTE: This bit should be set to 1 in AHCI/RAID mode. This bit is not reset by Function
Level Reset.
Reserved.
Attribute: R/W, R/WO
Size: 16 bits
Description
Section 1.3 for
567