linux-kernel - Re: [ARM] Regression ? at91rm9200 machine-type

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Date:	Wed, 27 Aug 2008 12:09:39 +0200
From:	Claudio Scordino <claudio@...dence.eu.com>
To:	Marc Pignat <marc.pignat@...s.ch>
CC:	lg@...x.de, rmk+kernel@....linux.org.uk,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [ARM] Regression ? at91rm9200 machine-type

Marc Pignat ha scritto:
> Hi!
> 
> On Tuesday 26 August 2008, you wrote:
>> Hi,
>>
>>     I have a custom board equivalent to AT91RM9200DK.
> If it is really equivalent, you can use the same MACH_TYPE, else you should
> register another.

I used the same MACH_TYPE.

> 
>> After commit
>>
>> 87fee013a23ad02821699aef5b76891b42959182
>>
>> [ARM] 4647/1: at91rm9200: Remove redundant machine-type verification
>> and manipulation
>>
>> I cannot boot my board anymore.
>>
>> Some more details:
>>   - I tried booting from both U-Boot 1.1.6 and U-Boot 1.3.4
>>   - I compiled U-Boot using "at91rm9200dk_config"
>>   - On U-Boot bootargs=console=ttyS0,115200 mem=32M
>> mtdparts=AT45DB642.spi0:-(filesystem) rootfstype=jffs2 root=/dev/mtdblock0
>>   - The .config of the kernel is in attachment
>>
>> I don't know if this is an actual regression or not (I'm not much
>> skilled in machine-types/boot process).
> 
> The "default machine" selection is a *hack* for machines with a bootloader too
> old, buggy or closed source.
> 
> The right fix is to change the MACH_TYPE that you've compiled in u-boot.
> 
>> However, it seems that the commit above, besides removing redundant 
>> machine type verification, removed the default machine type for 
>> unknown boards as well.
> 
> This is a cleanup patch, if the hack is not removed, bootloaders will *never*
> be fixed...

I see. Thank you for the explanations. Linux developers made things in
the right way by removing redundant machine type verification.

The bug is in U-Boot which passes the wrong mach type when compiled
for the at91rm9200dk board.

Many thanks for your quick answer.

              Claudio

-- 
Ing. Claudio Scordino		
Software Engineer, PhD
Tel. +39-050-5492050
http://retis.sssup.it/~scordino/

Evidence Srl
Embedded Real-Time Solutions
http://www.evidence.eu.com

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