PCI device not working

[Davide Viti]

I mean there are two controllers and both of them have a device "subtended"
(both 0x1b65:0xabba).
u-boot can see both devices, linux detects only the device attached to the
first controller.

Here's the output of lspci and /proc/iomem :

root@(none):/# lspci -v

0000:00:00.0 Class 0604: Device 1957:0100 (rev 11)

        Flags: bus master, fast devsel, latency 0

        Memory at <ignored> (32-bit, non-prefetchable)

        Bus: primary=00, secondary=01, subordinate=01, sec-latency=0

        I/O behind bridge: 00000000-00000fff

        Memory behind bridge: a0000000-afffffff

        Capabilities: [44] Power Management version 2

        Capabilities: [4c] Express Root Port (Slot-), MSI 00

        Capabilities: [100] Advanced Error Reporting



0000:01:00.0 Class 0280: Device 1b65:abba (rev 01)

        Flags: bus master, fast devsel, latency 0, IRQ 16

        Memory at a0000000 (32-bit, non-prefetchable) [size=1K]

        Memory at a0010000 (32-bit, non-prefetchable) [size=64K]

        Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit+

        Capabilities: [78] Power Management version 3

        Capabilities: [80] Express Endpoint, MSI 00

        Capabilities: [100] Virtual Channel <?>

        Capabilities: [800] Advanced Error Reporting



0001:02:00.0 Class 0604: Device 1957:0100 (rev 11)

        Flags: bus master, fast devsel, latency 0

        Memory at <ignored> (32-bit, non-prefetchable)

        Bus: primary=00, secondary=03, subordinate=03, sec-latency=0

        I/O behind bridge: 00000000-00000fff

        Memory behind bridge: b0000000-bfffffff

        Capabilities: [44] Power Management version 2

        Capabilities: [4c] Express Root Port (Slot-), MSI 00

        Capabilities: [100] Advanced Error Reporting


root@(none):/# cat /proc/iomem

a0000000-afffffff : /pcie at ffe09000

  a0000000-afffffff : PCI Bus 0000:01

    a0000000-a00003ff : 0000:01:00.0

    a0010000-a001ffff : 0000:01:00.0

b0000000-bfffffff : /pcie at ffe0a000

  b0000000-bfffffff : PCI Bus 0001:03

ef000000-efffffff : ef000000.nor

ffe04500-ffe04507 : serial

ffe04600-ffe04607 : serial


thanx for your help,

Davide


I mean that the kernel detects the first controller and the device attached
to it, plus the second controller: the device on the second controller is
not detected (same device as the one detected on the first controller)
2012/9/21 Kumar Gala <galak at kernel.crashing.org>

>
> On Sep 21, 2012, at 6:33 AM, Davide Viti wrote:
>
> > Hi,
> > I'm working on a custom board based on P1020 with two (identical) PCI
> devices attached;
> > The work is derived from another board with a single instance of that
> device.
> > The system is based on u-boot-2009.11 and Linux 2.6.34.6
> >
> > The "pci" command on u-boot, shows me both the PCI controllers and
> > the attached devices:
> >
> > Scanning PCI devices on bus 0
> > BusDevFun  VendorId   DeviceId   Device Class       Sub-Class
> > _____________________________________________________________
> > 00.00.00   0x1957     0x0100     Processor               0x20
> >
> > Scanning PCI devices on bus 1
> > BusDevFun  VendorId   DeviceId   Device Class       Sub-Class
> > _____________________________________________________________
> > 01.00.00   0x1b65     0xabba     Network controller      0x80
> >
> > Scanning PCI devices on bus 2
> > BusDevFun  VendorId   DeviceId   Device Class       Sub-Class
> > _____________________________________________________________
> > 02.00.00   0x1957     0x0100     Processor               0x20
> >
> > Scanning PCI devices on bus 3
> > BusDevFun  VendorId   DeviceId   Device Class       Sub-Class
> > _____________________________________________________________
> > 03.00.00   0x1b65     0xabba     Network controller      0x80
> >
> > The kernel detects only the first instance of the device.
>
> What do you mean by first instance of the device ?
>
> > Didn't get very far while looking at dts file and kernel logs, so I'm
> > asking for some help on narrowing down the problem.
> >
> > I'm wondering if I can assume that the problem is restricted to
> > kernel/dts and avoid concentrating on uboot.
> > I can provide any log (didn't want to post tons of details on the first
> > message)
>
> Probably a dts issue.
>
> What does lspci in linux say?
>
> - k
>
>
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