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List:       freebsd-ppc
Subject:    Re: Should the MPC8544 root complex really show up as a device?
From:       Justin Hibbits <jrh29 () alumni ! cwru ! edu>
Date:       2015-04-16 5:52:55
Message-ID: CAHSQbTBSy6vsSFTYEsuJOQmisiiU0cssT=APCrY+NQshGOVUCQ () mail ! gmail ! com
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On Wed, Apr 15, 2015 at 10:17 AM, Justin Hibbits <jrh29@alumni.cwru.edu> wrote:
> On Mon, Apr 13, 2015 at 3:39 PM, Marcel Moolenaar <marcel@xcllnt.net> wrote:
>>
>>> On Apr 13, 2015, at 3:28 PM, Justin Hibbits <jrh29@alumni.cwru.edu> wrote:
>>>
>>> I'm trying to get the mini-PCIe slot on my RouterBoard RB800 working,
>>> and running into a snag.  It works just fine in RouterOS (Linux), but
>>> on FreeBSD, the card in the slot doesn't show up.  From all my
>>> Googling, it appears the slot should show up on PCIe controller 1, but
>>> the only device that shows up is the root complex as 1/0:0:0, as type
>>> Processor.  Should this show up anyway?  Shouldn't the device behind
>>> it show up instead?
>>
>> The problem is that the device is flagged as a processor, not
>> as a PCI bridge. That's why it shows up and also why you don't
>> find anything underneath. One way to fix it is by spoofing the
>> device type in sys/powerpc/mpc85xx/pci_mpc85xx.c or otherwise
>> by changing common PCI code to accept this device as a (host)
>> bridge.
>>
>> HTH,
>>
>> --
>> Marcel Moolenaar
>> marcel@xcllnt.net
>
> Thanks Marcel,
>
> I did try spoofing it in pci_mpc85xx.c, with the attached patch (patch
> includes quite a bit of debug as well).  The reference manual doesn't
> indicate if the root complex appears on every controller, or just the
> first (there are 3 PCIe controllers on the MPC8544, and only the first
> has this device showing up).  Maybe I'm missing something.  This is
> new to me, and PCI configuration has always baffled me.  Trying to
> read bus 1 on the controller (which is configured in the Second Bus
> register), I only saw 0xff returned during probing in fsl_pcib_init().
> Been looking at the Linux driver for hints, but not a whole lot has
> come from that.
>
> Unfortunately, the last couple days my RouterBoard has decided it
> doesn't want to boot FreeBSD, so I have to debug that before I can
> continue working on this, but PCI register 0x4B0 (CFG_READY) seems a
> contender for needing initialized, although the documentation doesn't
> indicate if it's only relevant for EP mode or also relevant for RC
> mode.
>
> - Justin

One thing I just discovered:  Removing the card from the minipcie slot
causes the Processor device to disappear.

- Justin
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