Re: how to handle pata_via when controller not in fully-pci-native mode (two irqs?)

[Matt Sealey <matt@genesi-usa.com>]

Alan Cox wrote:
>> We can't make the controller TRULY legacy since there is not any good way
>> of mapping the IDE/BMDMA registers into the lower kilobyte or so of
>> memory - obviously PPC has no "io address space", it's all memory mapped,
>> so the lower kilobyte of "IO ports" is really the CPU zero page. It's not
>> a good idea to be poking around just there and we never intended that to work.
> 
> The right way to do this IMHO is still to use the PCI quirk side logic.
> Unfortunately to put your legacy ports at different I/O addresses you
> need changes which are still pending to the libata-sff code so that it
> stops using the hardcoded ATA_PRIMARY_FOO bits.

We can't move the IO ports. They're stuck in the PCI BAR.

All we can do is fix the IRQ steering in the "ISA bridge" to report a single
IRQ instead of two.

-- 
Matt Sealey <matt@genesi-usa.com>
Genesi, Manager, Developer Relations