Messages in this thread | | | Date | Tue, 28 Feb 2006 15:35:21 -0500 | From | Jon Ringle <> | Subject | Re: Linux running on a PCI Option device? |
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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?
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