Re: PATCH: Fix Jmicron support

Jeff Garzik
2006-07-12T17:05:28Z

Alan Cox wrote:
> Prior to 2.6.18rc1 you could install with devices on a JMicron chipset
> using the "all-generic-ide" option. As of this kernel the AHCI driver
> grabs the controller and rams it into AHCI mode losing the PATA ports
> and making CD drives and the like vanish. The all-generic-ide option
> fails because the AHCI driver grabbed the PCI device and reconfigured
> it.
>
> To fix this three things are needed.
>
> #1 We must put the chip into dual function mode
> #2 The AHCI driver must grab only function 0 (already in your rc1 tree)
> #3 Something must grab the PATA ports
>
> The attached patch is the minimal risk edition of this. It puts the chip
> into dual function mode so that AHCI will grab the SATA ports without
> losing the PATA ports. To keep the risk as low as possible the third
> patch adds the PCI identifiers for the PATA port and the FN check to the
> ide-generic driver. There is a more featured jmicron driver on its way
> but that adds risk and the ide-generic support is sufficient to install
> and run a system.
>
> The actual chip setup done by the quirk is the precise setup recommended
> by the vendor.
>
> (The JMB368 appears only in the ide-generic entry as it has no AHCI so
> does not need the quirk)
>
> Signed-off-by: Alan Cox <alan@redhat.com>

ACK for 2.6.18-rc1-git

The AHCI bits are already in 2.6.18-rc1. The drivers/ide new-PCI-ID
bits are arguably new features, but IMO obviously quite harmless.

Jeff