Shooting trouble on a PCI bus hang
imp at bsdimp.com
Mon Jun 20 16:11:48 UTC 2011
On Jun 20, 2011, at 6:49 AM, John Baldwin wrote:
> On Sunday, June 19, 2011 12:35:49 pm Ansar Mohammed wrote:
>> I appreciate that. The system works fine with NetBSD, LInux and Windows XP,
>> so I doubt its hardware.
>> Interesting though that OpenBSD has the same issue.
>> A question about the debug kernel load process: as it hangs on *
>> pci_print_verbose* in pci.c, can I deduce that this is the exact code
>> segment that is the issue?
> Well, if that was the last device on the bus it might be in a device driver
> probe routine. You can try adding more printfs to device_probe(), etc. to
> output each driver name as it probes each device perhaps.
We've also had problems with interrupt storms after the drivers have all probed, and people blame the last printf :)
It sounds, however, with the OpenBSD datapoint that something is being initialized bogusly, perhaps tripping over an erratum that the other systems avoid or have specific code to work around.
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