>>>>> On Thu, 30 Oct 2003 07:11:42 -0800, David Brownell <[EMAIL PROTECTED]> said:
David> David Mosberger wrote: >> On x86, there is no OOps, it just freezes. On ia64, I get a nice MCA >> and from that we can infer that a USB host controller read from >> address 0xf0000000 caused the problem but since this is asynchronous >> to the kernel's code path, the instruction pointer etc. in the MCA >> state dump isn't terribly helpful. David> Does that 0xf0000000 (on ia64) match any obvious address mapping David> of the null pointer -- like a dma mapping? Not really. AFAIK, 0xf0000000 is part of the PCI MMIO address space, but on the machines that I have access to, this particular address isn't assigned to any device: $ lspci -v|fgrep 'Memory at' Memory at 0000000080000000 (32-bit, prefetchable) [size=128M] Memory at 0000000088000000 (32-bit, non-prefetchable) [size=512K] Memory at 00000000d0023000 (32-bit, non-prefetchable) [size=4K] Memory at 00000000d0022000 (32-bit, non-prefetchable) [size=4K] Memory at 00000000d0021000 (32-bit, non-prefetchable) [size=256] Memory at 00000000d0020000 (32-bit, non-prefetchable) [size=4K] Memory at 00000000d0000000 (32-bit, non-prefetchable) [size=128K] Memory at 00000000e0200000 (32-bit, non-prefetchable) [size=4K] Memory at 00000000e0100000 (32-bit, non-prefetchable) [size=1M] David> I'm not sure that if the HID driver were to pass a null David> buffer pointer, it would be caught anywhere. OK, I'll try to find some time to trace the I/O MMU calls to see if something isn't kosher at that level. Is there a good way of getting a relatively high-level of tracing in the USB subsystem that would some me what's going on between the HID and the core USB level? --david ------------------------------------------------------- This SF.net email is sponsored by: SF.net Giveback Program. Does SourceForge.net help you be more productive? Does it help you create better code? SHARE THE LOVE, and help us help YOU! Click Here: http://sourceforge.net/donate/ _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel