On Fri, Jun 24, 2016 at 05:50:21PM +0200, Ralf Baechle wrote:
> > bcm1480
> > Andrew Isaacson <adi@xxxxxxxxxxxx>
> > dc41f94f7709 ("Support for the BCM1480 on-chip PCI-X bridge.")
> >
> > ip27
> > Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
> > 96173a6c4ebc ("[MIPS] IP27: misc fixes")
>
> Afair I did originally implement the IP27 use of PCI_PROBE_ONLY. The
> problem is that it was not possible for the kernel to assign resources
> properly on an IP27. Also that would invalidate firmware configuration
> information, so we had to live with whatever the firmware (mis)configured
> for us. Afair - it's a darn long time ... I think the reasoning for
> the BCM1480 was similar but Andy will hopefully recall the details.
I don't remember the details, unfortunately, but my general recollection
is similar -- CFE on bcm1480 was doing a fairly good job of configuring
PCI, and I think we needed to preserve the configuration for Reasons
rather than letting the kernel change things away from the CFE setup.
I unfortunately no longer have any 1480 hardware to test on, nor do I
know who's left at BCM who might be able to validate this change.
-andy
