Re: iomapping a big endian area

[Richard B. Johnson]

On Mon, 4 Apr 2005, David Vrabel wrote:

> James Bottomley wrote:
> > so can you provide an example of a BE bus (or device) used on a LE
> > platform that would actually benefit from this abstraction?
>
> The Network Processing Engines in the Intel IXP425 are big-endian and
> its XScale core may be run in little-endian mode. There's a bunch of
> gotchas related to running in little-endian mode so you typically run
> the IXP425 in big-endian mode, though.

But the Linux interface (on the CPU side of the PCI bus interface)
doesn't care about the implimentation details in the XScale
Core. That's why it's a complete subsystem, isolated from the
ix86 by the PCI/Bus interface.

> David Vrabel
> --
> David Vrabel, Design Engineer
>
> Arcom, Clifton Road           Tel: +44 (0)1223 411200 ext. 3233
> Cambridge CB1 7EA, UK         Web: http://www.arcom.com/


Cheers,
Dick Johnson
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