Re: [linux-usb-devel] Re: USB 2.0 ehci failure with large amount of RAM (4GB) on x86_64
Thanks for the patch. However, did you not get my very last message? Checking back through my mail logs, I think it might not have been delivered. After claiming that the dma mask fixed the problem, I quickly discovered that the dma was not what did it. Thus the patch you sent does not work. But, here is what does: If I rmmod ehci_hcd and then modprobe ehci_hcd, it works, and I get full USB 2.0 speed. There must be something happening in the clean-up code of the the ehci_hcd that fixes whatever conflict I'm having. When I originally made that patch and then reloaded the ehci_hcd module to test it, I mistakenly thought that it was the patch that was fixing the problem. I should have tested more thoroughly before sending the e-mail, but I got very excited. Sorry about that. After several days of using the rmmod/modprobe workaround, I do feel confident that it is a legitimate fix. --- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnkkid0709bid3057dat1642 ___ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
[linux-usb-devel] Re: USB 2.0 ehci failure with large amount of RAM (4GB) on x86_64
Like I said in my previous message, I am not a kernel developer. I am
a programmer though, so I thought I'd give your suggestions a try.
I added 1 line to drivers/usb/host/ehci-pci.c which sets the DMA mask,
and now it seems to work with ehci loaded and with 4 GB of RAM.
Unfortunately, I don't really understand what I did. Perhaps you have
a better idea what this is doing and if it is correct.
case PCI_VENDOR_ID_NVIDIA:
/* NVidia reports that certain chips don't handle
* QH, ITD, or SITD addresses above 2GB. (But TD,
* data buffer, and periodic schedule are normal.)
*/
dma_set_mask(hcd-self.controller, DMA_31BIT_MASK); /* I added
this line */
switch (pdev-device) {
case 0x003c:/* MCP04 */
case 0x005b:/* CK804 */
case 0x00d8:/* CK8 */
case 0x00e8:/* CK8S */
if (pci_set_consistent_dma_mask(pdev,
DMA_31BIT_MASK) 0)
ehci_warn(ehci, can't enable NVidia
workaround for 2GB RAM\n);
break;
}
break;
}
---
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[linux-usb-devel] Re: USB 2.0 ehci failure with large amount of RAM (4GB) on x86_64
Thanks for all suggestions. I tried passing mem=2048m to the kernel. This is with 2.6.16.13. This did fix the USB ehci problem. Of course the kernel only sees half of my RAM, so this is not a satisfactory long-term workaround. As for your other suggestions, I'm not sure how to implement those. I'm not a kernel developer. If you can give me more specific instructions or send me a patch I would be happy to try those out. Otherwise, if you feel that this is unrelated to the other entries in bugzilla with similar symptoms, I would be happy to submit a bug report. --- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnkkid0709bid3057dat1642 ___ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
[linux-usb-devel] Re: USB 2.0 ehci failure with large amount of RAM (4GB) on x86_64
I tried 2.6.17-rc3 and the problem persists. I don't see any messages about EHCI BIOS handoffs. --- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnkkid0709bid3057dat1642 ___ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
[linux-usb-devel] Re: USB 2.0 ehci failure with large amount of RAM (4GB) on x86_64
Yes, GART_IOMMU is already turned on. Do you want me to send more detailed debugging messages? Presumably you're running with the GART IOMMU? If not, then turn that on. Maybe even turn on IOMMU_DEBUG. --- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnkkid0709bid3057dat1642 ___ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
