From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Christopher S. Aker" <caker@theshore.net>
Subject: Re: Xen 4 serial hangs during boot
Date: Fri, 20 Jul 2012 15:44:05 -0400
Message-ID: <5009B505.8030900@theshore.net>
References: <CC2F70B8.39237%keir.xen@gmail.com>
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To: Keir Fraser <keir.xen@gmail.com>
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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.

-Chris