linux-kernel - Re: Segfault in fbcmap.c => Compiler bug?

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Date:	Thu, 11 Dec 2008 10:09:20 +0100
From:	Alex Raimondi <mailinglist@...omico.ch>
To:	Hans-Christian Egtvedt <hans-christian.egtvedt@...el.com>
CC:	kernel@...32linux.org, linux-kernel@...r.kernel.org
Subject: Re: Segfault in fbcmap.c => Compiler bug?

Hi, 

> On Thu, 11 Dec 2008 09:23:59 +0100
> Alex Raimondi <mailinglist@...omico.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.

I have both. AV32 toolchain from atmel is installed via apt-get. I have builroot 2.2.1 which 
generated a toolchain, as well. 

but kernel compilation is done using apt-get toolchain.

So, your suggestion is to remove the atmel stuff completely and use only buildroot toolchain?

Thx, 

Alex

> 
>> 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
> 

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