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[Xen-devel] Re: Hang on boot when using IPMI 2.0 SoL console

To: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Subject: [Xen-devel] Re: Hang on boot when using IPMI 2.0 SoL console
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Thu, 10 Dec 2009 05:57:26 +0000
Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
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On 10/12/2009 00:19, "Jeremy Fitzhardinge" <jeremy@xxxxxxxx> wrote:

> The console is an IPMI SoL console.  It appears as com3 (0x3e8 irq 5),
> so I've faked out com2 to point to it, since Xen seems to deny the
> existence of ports beyond com2.
> Linux works fine with ttyS2 as its serial console.
> I wonder if the (presumably emulated) serial device has some quirk that
> causes it to disagree with Xen's serial console here.  Is there anything
> significant about that particular moment?  Does it try to start using
> interrupts there?

Yes, that's probably it. Asynchronous interrupt-based serial I/O gets turned
on soon after the time subsystem is initialised. Also try adding boot
parameter 'sync_console'.

 -- Keir

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