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Date: Tue, 30 Aug 2011 13:08:43 -0500
From: Scott Wood <scottwood@freescale.com>
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To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Subject: Re: [PATCH] powerpc: Fix xmon for systems without MSR[RI]
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On 08/30/2011 01:11 AM, Benjamin Herrenschmidt wrote:
> On Mon, 2011-08-08 at 16:25 -0500, Jimi Xenidis wrote:
>> From: David Gibson <dwg@au1.ibm.com>
>>
>> Based on patch by David Gibson <dwg@au1.ibm.com>
>>
>> xmon has a longstanding bug on systems which are SMP-capable but lack
>> the MSR[RI] bit.  In these cases, xmon invoked by IPI on secondary
>> CPUs will not properly keep quiet, but will print stuff, thereby
>> garbling the primary xmon's output.  This patch fixes it, by ignoring
>> the RI bit if the processor does not support it.
>>
>> There's already a version of this for 4xx upstream, which we'll need
>> to extend to other RI-lacking CPUs at some point.  For now this adds
>> BookE processors to the mix.
> 
> Don't freescale one have RI ?

e500mc does.

e500v2 doesn't -- if a machine check happens while MSR[ME]=0, it causes
a checkstop.

-Scott