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From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
To: Juergen Beisert <jbe@pengutronix.de>
Cc: barebox@lists.infradead.org
Subject: Re: [RFC] Dedicated command to make a target bootable with Barebox
Date: Mon, 3 Sep 2012 12:55:34 +0200	[thread overview]
Message-ID: <20120903105534.GA19931@game.jcrosoft.org> (raw)
In-Reply-To: <201209031232.56813.jbe@pengutronix.de>

On 12:32 Mon 03 Sep     , Juergen Beisert wrote:
> Hi all,
> 
> currently I'm working on the difficult process to make an i.MX35 SoC boot from 
> an externally connected NAND device.
> 
> Nothing special with it, only the NAND flash controller in the i.MX35 (also in 
> i.MX25, i.MX27 and i.MX31) is braindamaged broken. This controller loses the 
> factory bad block markers when used without a workaround and losing these 
> markers is a _really_ bad idea.
> 
> But to use the workaround on these SoCs it needs a complicated preparation of 
> the NAND. Doing it manually is very error prone. And this kind of preparation 
> has to be kept when the system should be updated and so on. Not easy to 
> explain and so much more chances for the user to brick the system while the 
> update process.
> 
> This makes me think about a dedicated command which is responsible to make the 
> target bootable and does all the (more or less complicated) steps to ensure 
> the next time it gets powered it's able to boot again.
> 
> There are more architectures which needs a complicated setup to be able to 
> boot it from some kind of externally connected devices like NAND or eMMCs for 
> example. Some needs special NAND checksums only for the bootloader, others 
> needs to keep the partition table even if the bootloader gets updated and so 
> on.
> 
> Would it be possible to share one command (or one group of commands) by all 
> architectures? And each architecture adds its special code to the command? 
> 
> What kind of setup procedures we must cover with such a command?
> 
> My examples:
> 
> - for the Freescale i.MX SoCs with the broken NFC we must write the bootloader
>   in a different way than all the remaining data into the NAND device
> - for the Samsung S36410 we must save the factory bad block markers first to
>   support booting from NAND as its internal ROM expects the checksums at a
>   strange offset in the OOB area
On some ST SoC it's the same I think we do not need any command we just need
to specify it as mtd level for a specific mtd part

Best Regards,
J.

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  reply	other threads:[~2012-09-03 10:55 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-09-03 10:32 Juergen Beisert
2012-09-03 10:55 ` Jean-Christophe PLAGNIOL-VILLARD [this message]
2012-09-03 11:30   ` Sascha Hauer
2012-09-03 11:52     ` Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 11:37   ` Juergen Beisert

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