From: Sylvain Munaut <tnt@246tNt.com>
To: roger blofeld <blofeldus@yahoo.com>
Cc: linuxppc-embedded@ozlabs.org
Subject: Re: MPC5200 Cache coherency with BestComm issue
Date: Mon, 29 Nov 2004 00:22:01 +0100 [thread overview]
Message-ID: <41AA5D99.1000103@246tNt.com> (raw)
In-Reply-To: <20041127213940.72317.qmail@web53501.mail.yahoo.com>
Hi Roger
> By experimenting I have found that the BestComm and FEC work without
>the cache flush provided CPU_FTR_MAYBE_CAN_NAP is removed from the
>cputable (nap disables snooping) and that CPU_FTR_NEED_COHERENT is
>added to the cputable (turns on "M" bit in BAT/PTE so that the XLB has
>a chance of seeing a global transaction).
>
>
Thanks for the info.
The nap thing was indeed obvious ... The proper way to deactivate it
would be in lite5200.c
I added the powersave_nap = 1; as an example on how to allow it to nap.
I'll probably
comment it out by default with a note.
For the CPU_FTR_NEED_COHERENT, are you sure it's required ?
From my understanding of the G2Core manual, the M bit must be set if
you want the G2Core
to assert the global signal when it access memory. Here, we don't care
since only
the G2Core is snooping on the bus. So that should not be required ...
Sylvain
next prev parent reply other threads:[~2004-11-28 23:21 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-15 16:32 Lite5200 FEC Driver on linux 2.6 broken? roger blofeld
2004-11-15 17:34 ` Dale Farnsworth
2004-11-15 19:09 ` Lite5200 FEC Driver on linux 2.6 broken? (fixed) roger blofeld
2004-11-16 18:26 ` Lite5200 FEC Driver on linux 2.6 broken? (again) roger blofeld
2004-11-16 20:16 ` Dale Farnsworth
2004-11-16 21:28 ` roger blofeld
2004-11-18 20:22 ` Lite5200 FEC Driver on linux 2.6 broken? (fixed again) roger blofeld
2004-11-19 10:32 ` Sylvain Munaut
2004-11-19 14:53 ` roger blofeld
2004-11-21 16:10 ` Sylvain Munaut
2004-11-23 22:42 ` Lite5200 FEC Driver on linux 2.6 (updated) roger blofeld
2004-11-24 8:22 ` MPC5200 Cache coherency with BestComm issue (was: Lite5200 FEC Driver on linux 2.6 (updated)) Sylvain Munaut
2004-11-27 21:39 ` MPC5200 Cache coherency with BestComm issue roger blofeld
2004-11-28 23:22 ` Sylvain Munaut [this message]
2004-11-16 18:45 ` Lite5200 FEC Driver on linux 2.6 broken? Sylvain Munaut
-- strict thread matches above, loose matches on Subject: below --
2004-11-29 17:48 MPC5200 Cache coherency with BestComm issue roger blofeld
2004-11-29 18:29 ` Sylvain Munaut
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=41AA5D99.1000103@246tNt.com \
--to=tnt@246tnt.com \
--cc=blofeldus@yahoo.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).