440SPe/Katmai PCIe problems
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. ___ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
Re: 440SPe/Katmai PCIe problems
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. ___ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
RE: 440SPe/Katmai PCIe problems
-Original Message- From: Benjamin Herrenschmidt [mailto:b...@kernel.crashing.org] Sent: Tuesday, May 11, 2010 8:03 PM To: Stefan Roese Cc: linuxppc-dev; Pravin Bathija Subject: Re: 440SPe/Katmai PCIe problems 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. Ben, Thanks for bringing this to our attention. We'll research this issue. Regards, Pravin ___ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev