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SubjectRe: [PATCH] pata_acpi: take two
Alan wrote:
> --- linux.vanilla-2.6.20-rc6-mm3/drivers/ata/pata_amd.c 2007-01-31 14:20:10.000000000 +0000
> +++ linux-2.6.20-rc6-mm3/drivers/ata/pata_amd.c 2007-02-06 17:04:19.000000000 +0000
> @@ -642,6 +642,11 @@
> if (type == 1 && rev > 0x7)
> type = 2;
> +#if defined(CONFIG_ATA_ACPI)
> + /* Prefer the ACPI driver for Nvidia hardware */
> + if (pdev->vendor == PCI_VENDOR_ID_NVIDIA && ata_pata_acpi_present(pdev))
> + return -ENODEV;
> +#endif
> /* Check for AMD7411 */
> if (type == 3)
> /* FIFO is broken */

Problem with this approach is it may break distro/initrd setups since
the pata_amd driver appears to be the one that "should" work based on
the PCI ID, so the initrd would end up containing only this driver,
which will fail out with -ENODEV and cause a boot failure. If the root
filesystem was on a disk driven by this controller, the mkinitrd stuff
would have to "know" that it should also try loading pata_acpi.

Unless there are some Nvidia boxes out there which don't provide
_GTM/_STM ACPI methods (which seems a bit unlikely given Allen Martin's
comments) then we could potentially move the Nvidia PATA PCI IDs into
the pata_acpi driver, at least if ACPI is enabled in the kernel build..

Robert Hancock Saskatoon, SK, Canada
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