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Date: Wed, 20 Nov 2013 11:21:49 +0100
From: leroy christophe <christophe.leroy@c-s.fr>
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To: Scott Wood <scottwood@freescale.com>
CC: LinuxPPC-dev <linuxppc-dev@lists.ozlabs.org>, linux-kernel@vger.kernel.org,
        Joakim Tjernlund <joakim.tjernlund@transmode.se>
Subject: BUG: Patch "Convert some mftb/mftbu into mfspr" breaks MPC885
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Scott,

The patch "Convert some mftb/mftbu into mfspr" 
(beb2dc0a7a84be003ce54e98b95d65cc66e6e536) breaks startup on MPC885.

The CPU traps (SoftwareEmulation trap) at sched_clock() when trying to 
read TBU with mfspr.

Reverting the patch solves the issue.

What's the prefered way to fix this ?

Christophe