On Fri, 2013-12-06 at 18:48 -0600, Ruchika wrote:
> Hi,
> I am working with an p4080 based board. I am trying to get 2 PCIE
> controllers probed properly.
>
> In uboot I have no problems scanning and discovering what is connected
> to both controllers/PCI bridges.
>
> For both PCIE1/2 uboot sets up the Primary, secondary and Subordinate
> bus numbers to 0,1,1 respectively.
>
> When linux boots up and probes the controllers, PCIE1 is probed and the
> bridge scanned properly but PCIE2 is probed at the bridge but not
> attempted a scan.
> I see this message
> "pci 0001:02:00.0: bridge configuration invalid ([bus 01-01]), reconfiguring
> "
>
> I updated uboot to set the secondary and subordinate numbers to 2 (left
> the primary number to 0) and a subsequent kernel boot scanned the bus
> for PCIE2 successfully.
> I found these numbers to be very critical since the device tree blob
> (bus-range) for pci is also based off these.
>
> I'd like to get a good fix rather than the uboot hack and get better
> understanding of the problem. If there are any pointers someone could
> provide it would be awesome.
This is the code that prints that:
/* Check if setup is sensible at all */
if (!pass &&
(primary != bus->number || secondary <= bus->number ||
secondary > subordinate)) {
dev_info(&dev->dev, "bridge configuration invalid ([bus %02x-%0
secondary, subordinate);
broken = 1;
}
Start by printing out more information to determine which of those
checks is failing (e.g. what is primary and bus->number). If it turns
out that U-Boot is configuring the PCI bus incorrectly, send e-mail to
the U-Boot list. Be sure to mention what version of Linux and U-Boot
you're using.
-Scott
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