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From: Matthias Kaehlcke <matthias@kaehlcke.net>
To: Ivo Clarysse <ivo.clarysse@gmail.com>
Cc: barebox@lists.infradead.org
Subject: Re: Barebox working on freescale-mx25-3-stack?
Date: Wed, 24 Mar 2010 16:30:37 +0100	[thread overview]
Message-ID: <20100324153037.GC2328@darwin> (raw)
In-Reply-To: <ba216b431003240823l6b729cbfi6f4fa8e50173a933@mail.gmail.com>

hi ivo,

El Wed, Mar 24, 2010 at 04:23:33PM +0100 Ivo Clarysse ha dit:

> On Wed, Mar 24, 2010 at 4:08 PM, Matthias Kaehlcke
> <matthias@kaehlcke.net> wrote:
> >
> > after applying your patch barebox effectivly came up :)
> >
> > thanks a lot!
> >
> > could you explain in few words why the patch is needed?
> 
> RAM initialization is implemented in two places: lowlevel_init.S and
> the "Device Configuration Data" (DCD) block.
> 
> When booting from an SD card, the i.MX25 reads out the DCD block and
> applies the settings found there.
> 
> The RAM initialization in lowlevel_init.S is skipped when booting from
> SD; by the time board_init_lowlevel gets executed,
> that routine is already running from RAM, and will skip initializing memory.
> 
> The DCD table in barebox git contains entries for mDDR memory.  This
> does not work with DDR2 memory.
> 
> Probably barebox needs a compile-time option to switch between 128 MiB
> mDDR memory installed on older MCIMX25PDK CPU engine boards and the 64
> MiB DDR2 memory found on newer boards.

thanks a lot for your explication!

i wasn't aware that differently equipped CPU engine boards exists,
good to know

best regards

-- 
Matthias Kaehlcke
Embedded Linux Developer
Barcelona

    Me lo contaron y lo olvidé, lo vi y lo entendí, lo hice y lo aprendí
                              (Confucio)
                                                                 .''`.
    using free software / Debian GNU/Linux | http://debian.org  : :'  :
                                                                `. `'`
gpg --keyserver pgp.mit.edu --recv-keys 47D8E5D4                  `-

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  reply	other threads:[~2010-03-24 15:32 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-03-23 13:32 Matthias Kaehlcke
2010-03-23 13:38 ` Eric Bénard
2010-03-23 14:26 ` Sascha Hauer
2010-03-23 15:09   ` Matthias Kaehlcke
2010-03-23 15:31     ` Eric Bénard
2010-03-23 16:22       ` Matthias Kaehlcke
2010-03-23 16:32         ` Eric Bénard
2010-03-24 14:54         ` Ivo Clarysse
2010-03-24 15:08           ` Matthias Kaehlcke
2010-03-24 15:23             ` Ivo Clarysse
2010-03-24 15:30               ` Matthias Kaehlcke [this message]
2010-03-23 15:31     ` Sascha Hauer
2010-03-23 16:13       ` Matthias Kaehlcke

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