From: Jerry Van Baren <vanbaren_gerald@si.com>
To: linuxppc-embedded@lists.linuxppc.org
Subject: Re: Software FPU emulation
Date: Thu, 21 Feb 2002 06:57:46 -0500 [thread overview]
Message-ID: <5.1.0.14.2.20020221065102.01f08eb8@falcon.si.com> (raw)
In-Reply-To: <3C74B50C.CE9EAEB@multitech.co.in>
98% certainty it is a memory (UPM) problem. You are probably randomly
misreading an instruction as 0xFFxxxxxx which is a floating point
instruction. This causes a FP emulation trap. If you look at where the
trap occurred (SPR register SRR0) and look at the actual memory location in
question with your debugger, you probably will not find a FP instruction in
memory, which means it was misread.
gvb
At 02:21 PM 2/21/2002 +0530, srinivas pulipati wrote:
>hi all,
>
>i have ported linux-2.4.4 to my custmoboard based on mpc860.
>i got the bash prompt succesfully.
>
>but is is crashing sometimes and giving FPU emulation., sig:8.
>sometimes working perfectly.
>
>is it because of UPM programming problem or something else?
>
>thanks
>srinivas
>
>
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2002-02-21 11:57 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-02-21 8:51 Software FPU emulation srinivas pulipati
2002-02-21 11:57 ` Jerry Van Baren [this message]
-- strict thread matches above, loose matches on Subject: below --
2004-07-29 8:37 Software FPU Emulation hu
2004-07-29 17:11 ` Wolfgang Denk
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