This patch adds support for some chipsets in ahci driver.
The list comes from a patch for redhat kernel 2.6.9-34.
I only tested ICH8.

The original patch contained also this lines (that I omitted):
+       /* JMicron-specific fixup: make sure we're in AHCI mode */
+       if (pdev->vendor == 0x197b)
+               pci_write_config_byte(pdev, 0x41, 0xa1);
+


Ciao,
Filippo