Kernel cannot see PCI device

[Bjorn Helgaas]

On Thu, May 19, 2011 at 5:12 PM, Benjamin Herrenschmidt
<benh at kernel.crashing.org> wrote:
> On Thu, 2011-05-19 at 11:58 -0600, Bjorn Helgaas wrote:
>> The scan below PCIX0 (bus 0001:00) doesn't find anything.  You really
>> need a powerpc expert to help here, but in their absence, my guess
>> would be something's wrong with config space access, so I would start
>> by just adding some printks to ppc4xx_probe_pcix_bridge() to see if
>> the rsrc_cfg address looks reasonable.  You might need a chip spec or
>> maybe you can compare it to the device tree (I have no idea what the
>> relation between the device tree and OF is).
>>
>> You mentioned the u-boot "pci 2" command earlier.  It found a device
>> on bus 2, which means there must be at least one P2P bridge to get you
>> from bus 0 to bus 2.  So the output of "pci 0", "pci 1", "pci 80", and
>> "pci 81" (to compare with what Linux found) would be interesting.
>
> Well, if it's PCIe, there's the "virtual" P2P bridge of the root
> complex.
>
> The question is on what PCIe is his device connected, the one that we
> see or the one that's disabled in the device-tree.

I *think* the device Prashant is looking for ("02.00.00   0x1000
0x0072     Mass storage controller 0x00") is below the PCI-X bridge;
at least the canyonlands.dts he posted says that PCIX0 leads to buses
0-3f.