From: Ralf Baechle <ralf@linux-mips.org>
To: "Maciej W. Rozycki" <macro@linux-mips.org>
Cc: Jonas Gorski <jogo@openwrt.org>,
MIPS Mailing List <linux-mips@linux-mips.org>
Subject: Re: [PATCH v3] MIPS: Tell R4k SC and MC variations apart
Date: Tue, 24 Sep 2013 11:11:02 +0200 [thread overview]
Message-ID: <20130924091102.GB21257@linux-mips.org> (raw)
In-Reply-To: <alpine.LFD.2.03.1309231358090.16797@linux-mips.org>
On Mon, Sep 23, 2013 at 02:01:53PM +0100, Maciej W. Rozycki wrote:
> There is no reliable way to tell R4000/R4400 SC and MC variations apart,
> however simple heuristic should give good results. Only the MC version
> supports coherent caching so we can rely on such a mode having been set
> for KSEG0 by the power-on firmware to reliably indicate an MC processor.
> SC processors reportedly hang on coherent cached memory accesses and Linux
> is linked to a cached load address so the firmware has to use the correct
> caching mode to download the kernel image in a cached mode successfully.
>
> OTOH if the firmware chooses to use either the non-coherent cached or the
> uncached mode for KSEG0 on an MC processor, then the SC variant will be
> reported, just as we currently do, so no regression here.
Queued for 3.13. Thanks,
Ralf
next prev parent reply other threads:[~2013-09-24 9:11 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-22 22:30 [PATCH] MIPS: Tell R4k SC and MC variations apart Maciej W. Rozycki
2013-09-23 11:37 ` Jonas Gorski
2013-09-23 12:35 ` [PATCH v2] " Maciej W. Rozycki
2013-09-23 12:41 ` Jonas Gorski
2013-09-23 13:01 ` [PATCH v3] " Maciej W. Rozycki
2013-09-24 9:11 ` Ralf Baechle [this message]
2013-09-24 8:48 ` [PATCH] " Ralf Baechle
2013-09-24 23:37 ` Maciej W. Rozycki
2013-09-25 11:02 ` Ralf Baechle
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=20130924091102.GB21257@linux-mips.org \
--to=ralf@linux-mips.org \
--cc=jogo@openwrt.org \
--cc=linux-mips@linux-mips.org \
--cc=macro@linux-mips.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.