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SubjectRe: iomapping a big endian area
On Monday, April 4, 2005 7:25 am, James Bottomley wrote:
> On Mon, 2005-04-04 at 15:16 +0100, Christoph Hellwig wrote:
> > The IOC4 device that provides IDE, serial ports and external interrupts
> > on Altix systems has a big endian register layour, and the PCI-X bridge
> > in those Altix systems can do the swapping if a special bit is set.
> >
> > In older kernels that bit was set from the driver through a special API,
> > but it seems the firmware does that automatically now.
> We already have some unusual code in drivers to support other altix
> design ... features ... do you regard this as something that's likely to
> be replicated on other platforms, or is it more in the category of a one
> off mistake that can be corrected in firmware?

The whole line of altix pci bridges can do byteswapping, so it's more than
just one product that could benefit (however slightly). Not sure about other
bridges though.

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