linuxppc-dev.lists.ozlabs.org archive mirror
 help / color / mirror / Atom feed
From: Segher Boessenkool <segher@kernel.crashing.org>
To: David Gibson <david@gibson.dropbear.id.au>
Cc: linuxppc-dev <Linuxppc-dev@ozlabs.org>,
	Paul Mackerras <paulus@samba.org>
Subject: Re: [PATCH 10/13] powerpc: check cache coherency of kernel vs firmware
Date: Mon, 14 May 2007 14:34:49 +0200	[thread overview]
Message-ID: <13fe8e1b864142e1fdf766524eede73d@kernel.crashing.org> (raw)
In-Reply-To: <20070514004014.GF6517@localhost.localdomain>

>> check_cache_coherency() verifies that the cache coherency setting of
>> the kernel (CONFIG_NOT_COHERENT_CACHE) matches that left by the 
>> firmware,
>> as indicated by coherency-off device tree property.
>
> This looks really bogus.  If the firmware reports a coherency state,
> then presumably there's some hardware switch to turn coherency on or
> off.  In which case, can't the kernel just toggle that switch to
> whatever's appropriate for it?

But can the kernel know in all cases what is the
appropriate setting?  This kind of thing is a
typical firmware job.


Segher

  reply	other threads:[~2007-05-14 12:34 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-05-12  0:46 [PATCH 0/13] powerpc: Add support for Marvell/mv64x60 and prpmc2800 Mark A. Greer
2007-05-12  0:53 ` [PATCH 1/13] powerpc: Add Makefile rules to wrap dts file in zImage Mark A. Greer
2007-05-14  0:33   ` David Gibson
2007-05-14  3:46     ` Mark A. Greer
2007-05-14  3:49       ` David Gibson
2007-05-21 18:10     ` Mark A. Greer
2007-05-22  0:23       ` David Gibson
2007-05-24 21:28         ` Mark A. Greer
2007-05-25  1:32           ` David Gibson
2007-05-25  1:33             ` David Gibson
2007-05-25 20:50               ` Mark A. Greer
2007-05-28  4:43                 ` David Gibson
2007-05-12  0:54 ` [PATCH 2/13] powerpc: Add bootwrapper support for Marvell/mv64x60 hostbridge Mark A. Greer
2007-05-12  0:54 ` [PATCH 3/13] powerpc: Add bootwrapper support for Marvell MPSC Mark A. Greer
2007-05-12  0:54 ` [PATCH 4/13] powerpc: Add bootwrapper support for Marvell/mv64x60 I2C Mark A. Greer
2007-05-12  0:55 ` [PATCH 5/13] powerpc: Add interrupt support for Marvell mv64x60 chips Mark A. Greer
2007-05-12  0:55 ` [PATCH 6/13] powerpc: Create Marvell mv64x60 MPSC (serial) platform_data Mark A. Greer
2007-05-12  0:56 ` [PATCH 7/13] powerpc: Create Marvell mv64x60 ethernet platform_data Mark A. Greer
2007-05-12  0:56 ` [PATCH 8/13] powerpc: Create Marvell mv64x60 I2C platform_data Mark A. Greer
2007-05-12  0:57 ` [PATCH 9/13] powerpc: Add Marvell mv64x60 PCI bridge support Mark A. Greer
2007-05-12  0:57 ` [PATCH 10/13] powerpc: check cache coherency of kernel vs firmware Mark A. Greer
2007-05-14  0:40   ` David Gibson
2007-05-14 12:34     ` Segher Boessenkool [this message]
2007-05-14 14:44     ` Dale Farnsworth
2007-05-14 20:27       ` Mark A. Greer
2007-05-12  0:57 ` [PATCH 11/13] powerpc: Add DTS file for the Motorola PrPMC2800 platform Mark A. Greer
2007-05-12  0:58 ` [PATCH 12/13] powerpc: Add bootwrapper support for " Mark A. Greer
2007-05-12  0:58 ` [PATCH 13/13] powerpc: Add arch/powerpc support for the Motorola PrPMC2800 Mark A. Greer
  -- strict thread matches above, loose matches on Subject: below --
2007-05-10 20:02 [PATCH 0/13] powerpc: Add support for Marvell/mv64x60 and prpmc2800 Mark A. Greer
2007-05-10 20:08 ` [PATCH 10/13] powerpc: check cache coherency of kernel vs firmware Mark A. Greer

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=13fe8e1b864142e1fdf766524eede73d@kernel.crashing.org \
    --to=segher@kernel.crashing.org \
    --cc=Linuxppc-dev@ozlabs.org \
    --cc=david@gibson.dropbear.id.au \
    --cc=paulus@samba.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).