Problem
Sata disks are connected to onboard sata ports of PowerEdge 1900 (ESB2
southbridge chipset). If one of the port is disabled in the bios then they get
enabled again by the ata_piix driver because of a default port map being
written to the Port control and status register(0x91-93).
Instead the driver should preserve the bios setting by way of a fix like this.
Fix:
The BIOS configured PCS value must be anded logically with the default port map
for the chipset. This way the BIOS information will not be lost by the
reinitialization of the config space by the ata_piix driver. The below patch is
against 2.6.21 kernel.
--- ata_piix.c.orig 2007-06-08 02:38:03.000000000 +0530
+++ ata_piix.c 2007-06-08 02:39:45.000000000 +0530
@@ -990,7 +990,7 @@ static void __devinit piix_init_pcs(stru
pci_read_config_word(pdev, ICH5_PCS, &pcs);
- new_pcs = pcs | map_db->port_enable;
+ new_pcs = pcs & map_db->port_enable;
if (new_pcs != pcs) {
DPRINTK("updating PCS from 0x%x to 0x%x\n", pcs, new_pcs);
Signed-off-by: Shyam Iyer <[EMAIL PROTECTED]>
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