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To: Mohan Kumar M <mohan@in.ibm.com>
Subject: Re: [Fastboot] [PATCH] Fix interrupt distribution in ppc970 
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Date: Tue, 02 Jan 2007 09:07:53 -0600
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From: Doug Maxey <dwm@enoyolf.org>
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On Tue, 02 Jan 2007 17:12:12 +0530, Mohan Kumar M wrote:
> Even after updating the JS20 box with the latest firmware FW06470160
> dated 11/21/06, we are facing the same problems with "maxcpus=1" kernel
> parameter.

The codebases for the firmware diverged between JS20 and JS21 back in '04.
So it is more than just possible there is a firmware feature in play.