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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: Tue, 04 Sep 2001 15:50:21 -0400	[thread overview]
Message-ID: <3B95307D.1BE64A98@mvista.com> (raw)
In-Reply-To: 20010830175217.H858@zax


David Gibson wrote:
>
> First the question: is there a good reason that set_dec() is a no-op
> on 4xx, rather than setting the PIT?

Yes.  The PIT is far from a perfect approximation of the decrementer.
When you "set the PIT" you actually set the reload register, not the
value that is decrementing.


> Second a patch - the below adds floating point emulation to the 4xx.

Got it.  Thanks.  Since we now have libraries built specially for
processors without floating point, emulation isn't necessary.  Try
them out.


	-- Dan

** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

  parent reply	other threads:[~2001-09-04 19:50 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 ` Dan Malek [this message]
2001-09-05  1:04   ` 4xx - a question and a patch David Gibson
2001-09-05  4:18     ` Dan Malek
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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