From: Claudio Scordino <claudio@evidence.eu.com>
To: Marc Pignat <marc.pignat@hevs.ch>
Cc: lg@denx.de, rmk+kernel@arm.linux.org.uk,
Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: [ARM] Regression ? at91rm9200 machine-type
Date: Wed, 27 Aug 2008 12:09:39 +0200 [thread overview]
Message-ID: <48B527E3.6070204@evidence.eu.com> (raw)
In-Reply-To: <200808261443.12638.marc.pignat@hevs.ch>
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
next prev parent reply other threads:[~2008-08-27 10:10 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-26 10:30 [ARM] Regression ? at91rm9200 machine-type Claudio Scordino
2008-08-26 12:43 ` Marc Pignat
2008-08-26 13:19 ` Russell King
2008-08-27 10:09 ` Claudio Scordino [this message]
2008-08-26 13:17 ` Ben Dooks
2008-08-27 10:09 ` Claudio Scordino
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