mpc8568e-mds: pci-e is broken

[Kumar Gala]

On Jan 23, 2008, at 1:37 PM, Anton Vorontsov wrote:

> Hello Benjamin, Kumar,
>
> Using galak/powerpc.git's e4a0d8a1f7e6a9741ec46 head, MPC8568E-MDS
> is oopsing during PCI-E probe, like this:
>
> - - - -
> Found FSL PCI host bridge at 0x00000000e0008000. Firmware bus  
> number: 0->255
> PCI host bridge /pci at e0008000 (primary) ranges:
> MEM 0x0000000080000000..0x000000009fffffff -> 0x0000000080000000
>  IO 0x00000000e2000000..0x00000000e27fffff -> 0x0000000000000000
> Found FSL PCI host bridge at 0x00000000e000a000. Firmware bus  
> number: 0->255
> PCI host bridge /pcie at e000a000  ranges:
> MEM 0x00000000a0000000..0x00000000afffffff -> 0x00000000a0000000
>  IO 0x00000000e2800000..0x00000000e2ffffff -> 0x0000000000000000
>
> [...]
>
> PCI: Probing PCI hardware
> PCI: 0001:01:00.0: class b20 doesn't match header type 01. Ignoring  
> class.
> PCI: Closing bogus Apple Firmware region 1 on bus 0x02
> PCI: Closing bogus Apple Firmware region 2 on bus 0x02

odd, you shouldn't see these anymore w/my git tree.


>
> Unable to handle kernel paging request for data at address 0x00000000
> Faulting instruction address: 0xc0142760
> Oops: Kernel access of bad area, sig: 11 [#1]
> MPC85xx MDS
> Modules linked in:
> NIP: c0142760 LR: c01427a8 CTR: 00000000
> REGS: df823dc0 TRAP: 0300   Not tainted  (2.6.24-rc8-g146f2dc2-dirty)
> MSR: 00029000 <EE,ME>  CR: 42044082  XER: 00000000
> DEAR: 00000000, ESR: 00000000
> TASK = df820000[1] 'swapper' THREAD: df822000
> GPR00: 00000000 df823e70 df820000 df800380 000000d0 00000200  
> 00000004 c028aa6c
> GPR08: df81c200 00000007 00000000 df809a44 22044024 48fdafc9  
> 1fff4e00 c02276ec
> GPR16: c0227760 df823f98 c0227748 c0284efc c0227774 c0227788  
> c023e5b0 c02a9200
> GPR24: df8098d8 df823eac df809800 b6db6db7 00000000 00000008  
> 00000000 df8098e0
> Call Trace:
> [df823e70] [c01427a8]  (unreliable)
> [df823ea0] [c0143c9c]
> [df823f00] [c027a338]
> [df823f20] [c026e38c]
> [df823f30] [c026df08]
> [df823f60] [c02641ec]
> [df823ff0] [c000dc08]
> Instruction dump:
> 39290001 2f9d0006 7d4a4f5e 7f3ccb78 48000020 812b0004 800b0000  
> 39290001
> 7c004850 7f805040 419c0044 7fdcf378 <83dc0000> 38000000 2f9e0000  
> 41beffe8
> ---[ end trace 8640abe69a316dee ]---
> Kernel panic - not syncing: Attempted to kill init!
> Rebooting in 180 seconds..
> - - - -
>
>
> It seems like be8cbcd8896670a01ead7a29e33ff is at "fault".
>
> static void __devinit __pcibios_fixup_bus(struct pci_bus *bus)
> {
> ...
> 		if (i >= 3 && bus->self->transparent)
> 			continue;
> ...
> }
>
> That new check doesn't work, here bus->self->transparent == 0.
> Could it be that the message below is the root cause?
>
> PCI: 0001:01:00.0: class b20 doesn't match header type 01. Ignoring  
> class.

this is expected but of how FSL hw reports itself.

> I.e. drivers/pci/probe.c just don't setting transparent flag.
> I wonder if we need use quirk_transparent_bridge() here or
> we can fix it other way?
>
> Just in case, I'm observing that message for a long long time, and
> it didn't tell upon any functionality till now.


Is this with the 8568 MDS in standalone or plugged into the back pane?

- k