From: Kalle Pokki <kalle.pokki@iki.fi>
To: Alex Zeffertt <ajz@cambridgebroadband.com>
Cc: Dan Malek <dan@embeddedalley.com>, linuxppc-embedded@ozlabs.org
Subject: Re: CPM2 early console
Date: Tue, 04 Oct 2005 10:13:10 +0200 [thread overview]
Message-ID: <43423996.7090403@iki.fi> (raw)
In-Reply-To: <4340D7EF.2040709@iki.fi>
I found it. It's in the MPC8272 family errata. When setting pipeline
depth to one everything works. Can you Alex confirm this works also for
you? This errata should probably be included in the Linux kernel, since
it really depends on it. Right now I set this from the boot loader, but
perhaps head.S in the kernel would be the just as good.
Part I System Interface Unit (SIU) Errata
SIU18: ARTRY assertion when using pipeline depth of 0.
Devices:
MPC8272, MPC8271, MPC8248, MPC8247
Description:
Internal (60x) slave maintains a pipeline depth of zero by asserting
AACK only after TA. When ARTRY is
asserted, the 60x bus access is terminated and TA is not asserted. The
internal (60x) slave does not assert
AACK, since TA was not asserted.
Workaround:
Use a pipeline depth of one (BCR[PLDP]=0) for applications that require
memory coherency.
Fix Plan:
No fix plan at this time.
next prev parent reply other threads:[~2005-10-04 8:13 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-22 16:02 CPM2 early console Rune Torgersen
2005-09-22 16:05 ` Kumar Gala
2005-09-23 10:55 ` Kalle Pokki
2005-09-27 14:11 ` Kalle Pokki
2005-09-27 16:39 ` Dan Malek
2005-09-27 20:35 ` Kalle Pokki
2005-09-27 20:48 ` Dan Malek
2005-09-28 10:20 ` Kalle Pokki
2005-09-29 12:24 ` Kalle Pokki
2005-09-29 12:50 ` Dan Malek
2005-09-30 13:22 ` Alex Zeffertt
2005-09-30 13:42 ` Alex Zeffertt
2005-09-30 20:16 ` Kalle Pokki
2005-09-30 13:58 ` Dan Malek
2005-09-30 20:10 ` Kalle Pokki
2005-09-30 20:28 ` Dan Malek
2005-10-01 5:57 ` Kalle Pokki
2005-10-01 8:24 ` Roger Larsson
2005-10-02 16:59 ` Dan Malek
2005-10-03 7:04 ` Kalle Pokki
2005-10-04 8:13 ` Kalle Pokki [this message]
2005-10-04 9:59 ` Alex Zeffertt
2005-10-04 10:16 ` Kalle Pokki
2005-10-04 16:04 ` Dan Malek
-- strict thread matches above, loose matches on Subject: below --
2005-09-22 13:11 Kalle Pokki
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=43423996.7090403@iki.fi \
--to=kalle.pokki@iki.fi \
--cc=ajz@cambridgebroadband.com \
--cc=dan@embeddedalley.com \
--cc=linuxppc-embedded@ozlabs.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).