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Index Store Tag and Fetch&Lock in MIPS32 24KEc

To: linux-mips@linux-mips.org
Subject: Index Store Tag and Fetch&Lock in MIPS32 24KEc
From: "Mohamed Bamakhrama" <bamakhrama@gmail.com>
Date: Mon, 20 Aug 2007 10:15:25 +0200
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Hi all,
I have playing around with a Malta board which has a MIPS32 24KEc core
(PR.ID = 2.0.1).
I was testing the CACHE instruction and I observed the following
*weird* behavior:
I try to lock a given range of addresses within the cache. I tried to
do so with both operations (i.e. Index store tag and Fetch&Lock). What
I observe is that the Fetch&Lock is locking much *less* lines than
what the index store tag does. Is there anyone who is aware of any
constrains/errata regarding this issue?


Best regards,

-- 
Mohamed A. Bamakhrama
Am Schaeferanger 15, room 035
85764 Oberschleissheim, Germany
Email: bamakhra@cs.tum.edu
Web: http://home.cs.tum.edu/~bamakhra/
Mobile: +49-160-9349-2711

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