Messages in this thread | | | Date | Tue, 9 May 2006 22:37:00 -0700 | From | "Nathan Becker" <> | Subject | Re: USB 2.0 ehci failure with large amount of RAM (4GB) on x86_64 |
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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; } - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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