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Date: Thu, 11 Dec 2008 09:29:59 +0100
From: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>
To: Alex Raimondi <mailinglist@miromico.ch>
Cc: kernel@avr32linux.org, linux-kernel@vger.kernel.org
Subject: Re: Segfault in fbcmap.c => Compiler bug?
Message-ID: <20081211092959.6410c352@hcegtvedt>
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Organization: Atmel
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On Thu, 11 Dec 2008 09:23:59 +0100
Alex Raimondi <mailinglist@miromico.ch> wrote:

Hi Alex,

> I am using latest atmel avr32 kernel (2.6.27) form
> git://git.kernel.org/pub/scm/linux/kernel/git/hskinnemoen/avr32-2.6.git.
> I am on it's master branch. I added a few patches specific to our own
> board (hammerhead). 
> 

Which toolchain are you using? If you have grabbed it from atmel.com
you have to download Buildroot for AVR32 [1] and build your own
toolchain. The toolchain on atmel.com is broken.

> When compiling with support for atmel_lcdfb the kernel segfaults at
> module probe.
> 
> This is the segfault output:
> 
> **********************************
> alg: No test for stdrng (krng)
> io scheduler noop registered
> io scheduler cfq registered (default)
> atmel_lcdfb atmel_lcdfb.0: 225KiB frame buffer at 13940000 (mapped at
> b3940000) Unable to handle kernel NULL pointer dereference at virtual

Does indeed look like a known GCC bug.

<snipp> rest of kernel dump and debugging>

1: www.atmel.no/buildroot

-- 
Best regards,
Hans-Christian Egtvedt
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