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Re: another 4kc machine check.

To: "Greg Weeks" <greg.weeks@timesys.com>, "Ralf Baechle" <ralf@linux-mips.org>
Subject: Re: another 4kc machine check.
From: "Kevin D. Kissell" <kevink@mips.com>
Date: Mon, 11 Apr 2005 22:42:57 +0200
Cc: <linux-mips@linux-mips.org>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <42553E49.7080004@timesys.com> <4256991C.4020601@timesys.com> <20050408161357.GB19166@linux-mips.org> <4256B524.2080509@timesys.com> <425AD440.5050600@timesys.com>
Sender: linux-mips-bounce@linux-mips.org
One further comment:


> This patch appears to fix my machine check problem on the 4kc. The 4kc 
> shouldn't need an ssnop here, but this appears to fix it.


The 4Kc shouldn't need an ssnop/ehb for the purposes of a *load*, but
if the exception was on an instruction fetch, the documentation is reasonably
clear that there's a hazard of 3 cycles before the new entry can be used for
a fetch - which is what ERET will do in the case of a instruction fetch miss.

            Regards,

            Kevin K.

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