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4.1.2
Compatible Configuration - Option 1
This option is selected when one or more P-ATA devices are to be used. SATA device(s) may or
may not be attached to the SATA ports, but will not be accessible to software. Figure 1 illustrates
this configuration:
Figure 1. Compatible Configuration - Option 1
Note: In the figure above, devices represented by dotted lines may be attached, but are not accessible to
software.
Note: This configuration requires no additional programming of the Port Mapping register, as in this
configuration it has no effect on the P-ATA or SATA functions.
To enable this configuration, system BIOS:
1.
Shall not program the SATA (Device 31, Function 2) controller's base address registers
(Offsets 10h – 24h in PCI configuration space).
2.
Shall disable access to the SATA controller's I/O space by programming the command
register (PCI configuration, offset 04h, bit 0) with a 0.
3.
Shall disable the SATA function by programming bit 2 (D31_F2_DISABLE) of the Function
Disable register (Device 31, Function 0, Offset F2h) with a 1. This will insure that the PCI
configuration registers associated with the SATA function are not decoded and thus will
insure that operating system configuration software does not enumerate and configure the
SATA function.
4.
Shall insure that the SATA ports are not enabled. This is accomplished by writing '0' to bits
1:0 in the Port Control and Status (PCS) register.
5.
Shall program the P-ATA registers appropriately (the exact details are beyond the scope of
this document).
SATA Programmer's Reference Manual
Port 0
S-ATA
Port 1
®
Intel
ICH5
P-ATA
M
M
Theory of Operation
S
Primary
S
Secondary
15
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