[PATCH] SB600 for the Nemo board has non-zero devices on non-root bus

[Michael Ellerman]

Bjorn Helgaas <helgaas at kernel.org> writes:

> On Wed, Dec 06, 2017 at 11:57:03PM +1100, Michael Ellerman wrote:
>> Christian Zigotzky <chzigotzky at xenosoft.de> writes:
>> ...
>> >
>> > Hi Olof,
>> >
>> > Many thanks for your patch! :-) The RC2 of kernel 4.15 boots without any 
>> > problems on my P.A. Semi Nemo board (A-EON AmigaOne X1000). I don’t need 
>> > the additional boot argument 'pci=pcie_scan_all' anymore.
>> >
>> > Is it possible to merge it via the powerpc tree?
>> 
>> Yes.
>> 
>> It would be good to confirm that the change is harmless on other pasemi
>> boards. I'll try and get mine booted tomorrow, unless someone beats me
>> to it.
>
> Theoretically, it should not do any harm since it only turns off an
> enumeration optimization.  Boot will be slightly slower but should
> still work fine.

Yep OK.

> Darren's idea of doing it at the same time you tweak the SB600 "relax
> pci-e" bit is ideal because then the two pieces are obviously
> connected and it wouldn't affect any other systems at all.

Yes that would be ideal. That patch is currently out-of-tree I gather,
but I guess everyone who's using these machines must have that patch
anyway.

Darren what does that code look like? Can we get it upstream and close
the loop on this?

cheers