[PATCH] IDE on CHRP LongTrail

Benjamin Herrenschmidt benh at kernel.crashing.org
Tue Dec 24 18:40:32 EST 2002

On Mon, 2002-12-23 at 23:13, Geert Uytterhoeven wrote:
> This patch enables the SL82C105 IDE interface in the W83C553 PCI/ISA bridge on
> my CHRP LongTrail.
> There are 2 ways to configure the IDE interface:
>   - Legacy mode, using IRQ 14 for the primary channel, and IRQ 15 for the
>     secondary channel
>   - Native mode, using IRQ 32 (OpenPIC IRQ 16) for both channels
> Apparently Open Firmware left the IDE interface in legacy mode, while the
> interrupt property of the device pointed to the OpenPIC interrupt. Of course
> this mix of legacy and native mode didn't work well and no interrupts came
> through.
> With the patch below, the SL82C105 is configured for native mode and both IDE
> channels work. The patch applies to 2.4.21-pre2 as well, but there IDE seems to
> be broken on PPC in general.

I'd rather use a pci quirk here... also, why not make this generic to
all PPCs with a W83c553 ? I know the briQ at least will need something

Regarding 2.4.21-pre2, did you check the linuxppc_2_4 tree ?


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