[PATCH v3 3/3] PCI: ARM: add support for generic PCI host controller

Arnd Bergmann arnd at arndb.de
Tue Feb 18 14:32:33 EST 2014

On Tuesday 18 February 2014 19:09:29 Will Deacon wrote:
> > Regarding the 0x6200.. There are two conflicting issues there 
> >  - You really don't want to let the PCI core assign resources to that
> >    range, it probably won't work.
> Right, with kvmtool we don't support resource assignment (the BARs are fixed)
> so everything is PCI_PROBE_ONLY.

Ok, I looked at the source now and can confirm:

* 0x0-0x1000 are used for lots of legacy ISA devices.
* PCI devices get assigned IO addresses in 0x400 steps starting at 0x6200.
* There are three PCI drivers doing this: VESA, PCI-SHMEM and virtio-pci.

Regarding the PCI_PROBE_ONLY flag, how do you set that? Should we
have a standard DT property for that? On PowerPC we already specified
"linux,pci-probe-only" and "linux,pci-assign-all-buses", which seems
reasonable to use in architecture independent code as well.


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