From: Benjamin Davis <bmdavis@arlut•utexas.edu>
To: "Mark A. Greer" <mgreer@mvista•com>
Cc: linuxppc-embedded <linuxppc-embedded@lists•linuxppc.org>
Subject: Re: gt-64260 Question
Date: Tue, 25 Nov 2003 12:27:34 -0600 [thread overview]
Message-ID: <3FC39F16.5040208@arlut.utexas.edu> (raw)
In-Reply-To: 3FC39A87.4060701@mvista.com
Errata 9 of http://e-www.motorola.com/files/32bit/doc/errata/MPC7455CE.pdf
talks about some issues with QACK, I further noticed how in
arch/ppc/platform/pmac_feature.c, in probe_uninorth:
if (uninorth_rev < 0x11) {
actrl = UN_IN(UNI_N_ARB_CTRL) & ~UNI_N_ARB_CTRL_QACK_DELAY_MASK;
actrl |= ((uninorth_rev < 3) ? UNI_N_ARB_CTRL_QACK_DELAY105 :
UNI_N_ARB_CTRL_QACK_DELAY) << UNI_N_ARB_CTRL_QACK_DELAY_SHIFT;
UN_OUT(UNI_N_ARB_CTRL, actrl);
It would appear to me that a QACK delay is being set by communication
with the uninorth. I will say now though this is my first experiance
with the kernel.
I was kinda thinking they might have gotten around the errata by
extending the delay of the QACK. This QACK is the system saying it is
time to get out of nap, and snoop.
thanks
--
--
Benjamin Davis
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2003-11-25 18:27 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-11-25 17:41 gt-64260 Question Benjamin Davis
2003-11-25 18:08 ` Mark A. Greer
2003-11-25 18:27 ` Benjamin Davis [this message]
2003-11-25 20:24 ` Mark A. Greer
-- strict thread matches above, loose matches on Subject: below --
2003-11-25 20:59 Milliorn Gary-rxcr80
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