From: Keir Fraser <keir@xen.org>
To: "Christopher S. Aker" <caker@theshore.net>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>,
xen devel <xen-devel@lists.xensource.com>
Subject: Re: Xen 4 serial hangs during boot
Date: Fri, 20 Jul 2012 20:59:29 +0100 [thread overview]
Message-ID: <CC2F7731.4643E%keir@xen.org> (raw)
In-Reply-To: <5009B505.8030900@theshore.net>
On 20/07/2012 20:44, "Christopher S. Aker" <caker@theshore.net> 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
next prev parent reply other threads:[~2012-07-20 19:59 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-12 19:34 Xen 4 occasionally hangs during boot Christopher S. Aker
2011-10-13 7:04 ` Jan Beulich
2011-10-13 10:46 ` Tim Deegan
2012-07-20 17:48 ` Xen 4 serial " Christopher S. Aker
2012-07-20 17:49 ` Andrew Cooper
2012-07-20 17:58 ` Christopher S. Aker
2012-07-20 18:05 ` Andrew Cooper
2012-07-20 19:10 ` Christopher S. Aker
2012-07-20 19:25 ` Andrew Cooper
2012-07-20 19:31 ` Keir Fraser
2012-07-20 19:44 ` Christopher S. Aker
2012-07-20 19:59 ` Keir Fraser [this message]
2012-07-23 14:13 ` Konrad Rzeszutek Wilk
2012-07-23 15:26 ` Keir Fraser
2012-07-23 20:53 ` Christopher S. Aker
2012-07-23 22:03 ` Malcolm Crossley
2012-07-23 22:45 ` Malcolm Crossley
2012-07-24 9:40 ` Andrew Cooper
2012-07-24 10:32 ` Jan Beulich
2012-07-26 13:50 ` Konrad Rzeszutek Wilk
2012-07-26 14:10 ` Jan Beulich
2012-07-26 14:36 ` Konrad Rzeszutek Wilk
2012-07-24 10:46 ` Jan Beulich
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