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From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Mauro Carvalho Chehab <mchehab@redhat.com>,
	Keir Fraser <keir.fraser@eu.citrix.com>,
	Xen-devel <xen-devel@lists.xensource.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Problems with serial interrupts with IPMI 2.0 SoL
Date: Thu, 10 Dec 2009 13:45:54 -0800	[thread overview]
Message-ID: <4B216C12.1020001@goop.org> (raw)

Hi,

I'm using a system with an embedded IPMI 2.0 BMC which provides SoL 
(Supermicro X8SIL-F).  This works fine under Linux (fully interrupt 
driven), but fails for Xen as it appears to not be sending interrupts; 
it works OK if I set the driver to polling mode.

I'm assuming the Xen is tickling some bug in the emulated 16550.  The 
Linux driver has a couple of pieces of code to explicitly work around 
bugs in the Intel AMT SoL implementation, but I don't think they're 
coming into play here (because there are no Intel SoL PCI devices on 
this system to trigger the NO_TXEN_TEST flag).

I'm wondering if you have any pointers or suggestions about more subtle 
problems?

Thanks,
     J

             reply	other threads:[~2009-12-10 21:45 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-12-10 21:45 Jeremy Fitzhardinge [this message]
2009-12-10 23:55 ` Problems with serial interrupts with IPMI 2.0 SoL Mauro Carvalho Chehab

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