4.6 SATA BIOS
Windows 2000 and XP
Enhanced Mode (default BIOS Setting)
—Separate IDE controller
• PATA Controller in Legacy Mode
- Device 0 is accessible as Device 0 of
PATA controller's Primary Channel
- Device 1 is accessible as Device 1of
PATA controller's Primary Channel
• SATA Controller in Native Mode
- SATA 0 is accessible as Device 0 of
SATA controller's Primary Channel
- SATA 1 is accessible as Device 0 of
SATA controller's Secondary Channel
SATA 2 is accessible as Device 1of
SATA controller's Primary Channel
- SATA 3 is accessible as Device 1 of
SATA controller's Secondary Channel
4.6.1 Legacy Mode
The Legacy mode is used to access devices attached to the embedded IDE controllers. Each
channel requires two fixed I/O address ranges and an IRQ for each.
■
Primary Channel
❏
Command block: 1F0h - 1F7h
❏
Control block: 3F6h
❏
IRQ: 14
■
Secondary Channel
❏
Command block: 170h - 177h
❏
Control block: 376h
❏
IRQ: 15
4.6.2 Native Mode
The native mode is used to access devices attached to add-in cards and is not supported by many
legacy operating systems. Addresses are assigned by PCI Plug-n-Play BIOS and the IRQ is
shared with multiple controllers. Base Address Registers for the Command and Control Block
are found in the PCI Configuration Space.
■
Offset 10h—Primary Command base address
■
Offset 14h—Primary Control base address
■
Offset 18h—Secondary Command base address
■
Offset 1Ch—Secondary Control base address
Service Reference Guide, dc5100
Serial and Parallel ATA Drive Guidelines and Features
Windows 9x, NT, and Linux
Compatibility Mode (non-default BIOS Setting)
—Combined IDE controller
• PATA Controller in Legacy Mode
- Device 0 is accessible as Device 0 of the
combined controller's Secondary
Channel
- Device 1 is accessible as Device 1of the
combined controller's Secondary
Channel
• SATA Controller in Legacy Mode
- SATA 0 is accessible as Device 0 of the
combined controller's Primary Channel
- SATA 1 is inaccessible
- SATA 2 is accessible as device 1 of the
combined controller's Primary Channel
- SATA 3 is inaccessible
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