Re: Linux running on a PCI Option device?

[Jon Ringle]

On Thursday 09 February 2006 01:43 am, Greg Ungerer wrote:
> Hi Jon,
>
> Jon Ringle wrote:
> > I am working on a new board that will have Linux running on an xscale
> > processor. This board will be a PCI Option device. I currently have a
> > IXDP465 eval board which has a PCI Option connector that I will use for
> > prototyping. From what I can tell so far, Linux wants to scan the PCI bus
> > for devices as if it is the PCI host. Is there any provision in Linux so
> > that it can take on the role of a PCI option rather than a PCI host?
>
> Have a look at the code in arch/arm/mach-ixp4xx/common-pci.c, in
> the function ixp4xx_pci_preinit().
>
> It does a check on whether the PCI bus is configured as HOST or not.
> I don't know if that code support is enough for it all to work right
> though (I certainly haven't tried it on either the 425 or 465...)

When I have the IXDP465 in PCI Option mode, Linux still writes to pci 
configuration space which confuses the heck out of the PCI Host (Windows 
2003). What do I need to do in order to have Linux work as a PCI option but 
still not mess with the pci configuration, and leave that task to the PCI 
Host?

Jon
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