440SPe/Katmai PCIe problems

440SPe/Katmai PCIe problems

[Benjamin Herrenschmidt]

Hi Stefan !

(Or somebody from AMCC)

I noticed we still have this old problem on PCIe where some cards don't
seem to work. The link trains but they don't respond on config space.
This is the case for example of that Sunix quad USB card. It seems to be
related to the kind of TI PCIe <-> PCI bridge on these though.

Have anybody tracked down the root cause of the problem ? Some say that
it could be that the bridge doesn't cope with the double reset (uboot
then kernel). Would it be possible to tell uboot to avoid touching the
PCIe interface completely so the kernel is the first one to get in ?

Cheers,
Ben.

Re: 440SPe/Katmai PCIe problems

[Benjamin Herrenschmidt]

On Wed, 2010-05-12 at 12:40 +1000, Benjamin Herrenschmidt wrote:
> Hi Stefan !
> 
> (Or somebody from AMCC)
> 
> I noticed we still have this old problem on PCIe where some cards don't
> seem to work. The link trains but they don't respond on config space.
> This is the case for example of that Sunix quad USB card. It seems to be
> related to the kind of TI PCIe <-> PCI bridge on these though.
> 
> Have anybody tracked down the root cause of the problem ? Some say that
> it could be that the bridge doesn't cope with the double reset (uboot
> then kernel). Would it be possible to tell uboot to avoid touching the
> PCIe interface completely so the kernel is the first one to get in ?

Actually... the card works in the Canyonlands using the latest u-boot
from ftp.denx.de (u-boot-nand.bin-2009.11.1), though interestingly
enough, this u-boot fails to detect an XGI Z11 video card that I have,
whichever slot I put it in.

in fact, the kernel itself detects the card and times out trying to get
a link. It works with whatever u-boot I used to have in there (and no
longer do ... oops :-)

Cheers,
Ben.

RE: 440SPe/Katmai PCIe problems

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