LibBSD PowerPC motorola_shared BSP PCI Support

[Heinz Junkes]

Good morning Chris,
i will now try out libbsd on a MVME6100 (beatnik).
Is the mentioned patch in git? Or do I have to prepare something special?
Thanks Heinz

> On 21. Oct 2020, at 02:44, Chris Johns <chrisj at rtems.org> wrote:
> 
> On 21/10/20 2:52 am, Sebastian Huber wrote:
>> On 20/10/2020 03:52, chrisj at rtems.org wrote:
>> 
>>> Tested on a MVME2700 (mvme2307) BSP:
>>> 
>>> nexus0: <RTEMS Nexus device>
>>> pcib0 pcibus 0 on motherboard
>>> pci0: <PCI bus> on pcib0
>>> pci0: <bridge, HOST-PCI> at device 0.0 (no driver attached)
>>> pci0: <bridge, PCI-ISA> at device 11.0 (no driver attached)
>>> pci0: <mass storage, ATA> at device 11.1 (no driver attached)
>>> pci0: <mass storage, SCSI> at device 12.0 (no driver attached)
>>> pci0: <bridge> at device 13.0 (no driver attached)
>>> pci0: <network, ethernet> at device 14.0 (no driver attached)
>> Does this mean that the legacy x86 PCI bus driver works on this PowerPC board?
>> Are there no big-endian vs. little-endian issues?
> 
> It seems there are no issues with the limited testing I have performed. I have
> not done extensive testing but the if_dc.c (tulip driver) does probe the bus and
> the correct device/vendor id is returned. The fact there currently is no support
> for the 21140 on the MVMEW2700 in the driver is different issue and not related
> to this patch.
> 
> I had a detailed look at the few calls that are being made and everything seems
> to work as expected. There is a lot of hardware in the PCI bridges on these
> boards to handle endian mapping. The same hardware set up is being used as 4.10
> and legacy stack combination and that works.
> 
> I suspect there may be changes needed in relation to resource allocations but I
> thought those can be in follow up patches.
> 
> Chris
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