From: Dan Malek <dan@mvista.com>
To: David Gibson <david@gibson.dropbear.id.au>
Cc: linuxppc-embedded@lists.linuxppc.org
Subject: Re: 4xx - a question and a patch
Date: Wed, 05 Sep 2001 00:18:30 -0400 [thread overview]
Message-ID: <3B95A796.248A0E99@mvista.com> (raw)
In-Reply-To: 20010905110451.A599@zax
David Gibson wrote:
> The 405gp manual implies that an mtspr to the PIT writes both the
> decrementing value and the reload register. Is this a hardware /
> documentation bug?
Well, the point is that it writes the reload register. When it
gets to zero, it reloads with this register, which is wrong.
> ..... Could the PIT be used this way if auto-reload was
> disabled?
No, because the PIT doesn't count down past zero. If they would
have allowed this, we could have disabled the auto-reload and
treated it just like the decrementer.
The best I could come up with is just allow the PIT run with a
proper and fixed reload value. It isn't a decrementer and we
can't treat it like one.
> Sure, but it's still useful to be able to run binaries copied from
> "normal" PPC machines.
Just remember that you can't be mixing float emulation and in-line
floating point software.
-- Dan
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2001-09-05 4:18 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-08-30 7:52 4xx - a question and a patch David Gibson
2001-08-30 8:54 ` HHL 2.0 Journeyman and SuSE Linux Steven Scholz
2001-08-30 16:21 ` Tom Rini
2001-08-31 7:48 ` Steven Scholz
2001-09-04 19:50 ` 4xx - a question and a patch Dan Malek
2001-09-05 1:04 ` David Gibson
2001-09-05 4:18 ` Dan Malek [this message]
2001-09-05 4:41 ` David Gibson
2001-09-05 15:34 ` Dan Malek
2001-09-06 1:06 ` David Gibson
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