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From: thomas.petazzoni@free-electrons.com (Thomas Petazzoni)
To: linux-arm-kernel@lists.infradead.org
Subject: v3.10 - big endian core support
Date: Tue, 9 Jul 2013 17:36:06 +0200	[thread overview]
Message-ID: <20130709173606.488fe85b@skate> (raw)
In-Reply-To: <20130708170352.GA24361@mudshark.cambridge.arm.com>

Dear Will Deacon,

On Mon, 8 Jul 2013 18:03:53 +0100, Will Deacon wrote:
> On Mon, Jul 08, 2013 at 12:02:02PM +0100, Will Deacon wrote:
> > On Mon, Jul 08, 2013 at 10:51:59AM +0100, jgq516 at gmail.com wrote:
> > > The printascii can output before "b __enable_mmu", after move it to
> > > __mmap_switched, nothing can be printed. But if disable LPAE, printascii
> > > works again in __mmap_switched.
> > 
> > Ok, so the page tables are broken. The code is there to swap the two words,
> > but perhaps something ends up being off-by-4 or the like. I'll try and take
> > a look.
> 
> Right, I managed to have a quick play with a 3.10 kernel and the good news
> is that the page tables are fine. The bad part is that using
> CONFIG_ARM_ATAG_DTB_COMPAT to get my command-line from ATAGs into the FDT
> results in a NULL command line, so I don't see any output. If I hardcode the
> command line in the kernel image, things work fine.

Ben Dooks has a separate branch on top of this base branch for
big-endian support, that adds atags compat code to convert the ATAGs
data from LE to BE. See the baserock/311/be/atags branch in
git://git.baserock.org/delta/linux. Or
http://git.baserock.org/cgi-bin/cgit.cgi/delta/linux.git/log/?h=baserock/311/be/atags.

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com

  parent reply	other threads:[~2013-07-09 15:36 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-07-01 11:03 v3.10 - big endian core support Ben Dooks
2013-07-01 11:03 ` [PATCH 01/10] ARM: fix ARCH_IXP4xx usage of ARCH_SUPPORTS_BIG_ENDIAN Ben Dooks
2013-07-01 11:04 ` [PATCH 02/10] ARM: asm: Add ARM_BE8() assembly helper Ben Dooks
2013-07-01 11:04 ` [PATCH 03/10] ARM: fixup_pv_table bug when CPU_ENDIAN_BE8 Ben Dooks
2013-07-01 11:04 ` [PATCH 04/10] ARM: set BE8 if LE in head code Ben Dooks
2013-07-01 11:04 ` [PATCH 05/10] ARM: pl01x debug code endian fix Ben Dooks
2013-07-01 11:04 ` [PATCH 06/10] ARM: twd: data " Ben Dooks
2013-07-01 11:04 ` [PATCH 07/10] ARM: smp_scu: data endian fixes Ben Dooks
2013-07-01 11:04 ` [PATCH 08/10] highbank: enable big-endian Ben Dooks
2013-07-01 11:04 ` [PATCH 09/10] mvebu: support running big-endian Ben Dooks
2013-07-01 11:04 ` [PATCH 10/10] vexpress: add big endian support Ben Dooks
2013-07-01 14:33 ` v3.10 - big endian core support Thomas Petazzoni
2013-07-01 15:20   ` Ben Dooks
2013-07-08  5:39 ` jgq516 at gmail.com
2013-07-08  8:49   ` Will Deacon
2013-07-08  9:51     ` jgq516 at gmail.com
2013-07-08 11:02       ` Will Deacon
2013-07-08 17:03         ` Will Deacon
2013-07-09  1:18           ` jgq516 at gmail.com
2013-07-09  3:34             ` jgq516 at gmail.com
2013-07-09  7:45               ` Will Deacon
2013-07-09  9:55                 ` jgq516 at gmail.com
2013-07-09 10:04                   ` jgq516 at gmail.com
2013-07-09 15:36           ` Thomas Petazzoni [this message]
2013-07-08  9:58   ` Ben Dooks
2013-07-08 10:03     ` jgq516 at gmail.com
2013-07-08 11:10       ` Ben Dooks
2013-07-09  9:53         ` jgq516 at gmail.com
2013-07-09  9:59           ` Ben Dooks
     [not found] <CALicx6u89THSiRa4FzGZrcoG8q+o_BD8qVEC4CYXEjPUVK_fJw@mail.gmail.com>
2013-07-12 11:47 ` Thomas Petazzoni
2013-07-12 11:56   ` Vijay Kilari
2013-07-12 12:00     ` Ben Dooks
2013-07-15  2:50       ` jgq516 at gmail.com
2013-07-15  6:15         ` Vijay Kilari
2013-07-12 11:58   ` Ben Dooks
2013-07-12 12:06     ` Thomas Petazzoni
2013-07-12 12:33       ` Ben Dooks
2013-07-14 21:53     ` Will Deacon
2013-07-15  8:03       ` Ben Dooks
2013-07-15  8:36         ` Thomas Petazzoni
2013-07-15  9:02           ` jgq516 at gmail.com
2013-07-15 10:26           ` Ben Dooks
2013-07-15 13:17             ` Thomas Petazzoni
2013-07-16  8:00             ` jgq516 at gmail.com
2013-07-16 10:38               ` Ben Dooks

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