Re: [Xen-devel] Xen 4 serial hangs during boot

[Keir Fraser <keir@xxxxxxx>]

On 20/07/2012 20:44, "Christopher S. Aker" <caker@xxxxxxxxxxxx> wrote:

> On 7/20/12 3:31 PM, Keir Fraser wrote:
>> Somehow dom0 disabled the serial-line interrupt during boot. Possibly it
>> appeared as a PnP device in some BIOS table and dom0 decided to disable it
>> because it doesn't think it is being used. Xen would usually stop this
>> happening via programming of the IO-APIC/XT-PIC but perhaps there is some
>> other method of disabling it on this mainboard, which Xen doesn't catch.
> 
> Hmm -- except dom0 hasn't even booted yet at the time the serial stops
> working.  Xen is 30-60 seconds away from booting dom0 given the RAM
> scrub still has to happen.

Then it is Xen doing something to kill the serial interrupt. ;-) I haven't
seen anything like this reported before. Not sure what to suggest really...
Gather debug output from interrupt-related debug keys (via the xl debug-keys
interface) I suppose. I think that would be 'i' and 'z' keys. That plus Xen
and dom0 boot logs... something might become apparent.

 -- Keir

> -Chris



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