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

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Date:	Tue, 26 Aug 2008 14:43:12 +0200
From:	Marc Pignat <marc.pignat@...s.ch>
To:	Claudio Scordino <claudio@...dence.eu.com>
Cc:	lg@...x.de, rmk+kernel@....linux.org.uk,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [ARM] Regression ? at91rm9200 machine-type

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.

> 
> 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...

Best regards


Marc

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