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From: Thomas Mayer <tm.telemotive@gmx.de>
To: barebox@lists.infradead.org
Subject: Re: Update barebox on mmc without touching partition table
Date: Wed, 13 Apr 2011 11:28:33 +0200	[thread overview]
Message-ID: <4DA56CC1.6040904@gmx.de> (raw)
In-Reply-To: <20110408132127.GW7285@pengutronix.de>

Hi Sasha,

thanks for your help!

Am 08.04.2011 15:21, schrieb Sascha Hauer:
> Hi Thomas,
>
> On Fri, Apr 08, 2011 at 11:18:36AM +0200, Thomas Mayer wrote:
>> Hi,
>>
>> to copy barebox to a mmc I use the command "dd if=barebox.bin
>> of=/dev/sdb bs=512 seek=2 skip=2&&  sync". So I don't touch the
>> first 0x400 bytes with contains the partition table and everything
>> is fine.
>>
>> But I want to write a little script to update barebox itself via
>> tftp. So I create a partition "/dev/self0" (0x00000 to 0x40000) and
>> update barebox with "tftp barebox.bin /dev/self0". The problem is
>> that barebox write the first 0x400 bytes too and overwrite the
>> partition table .
>>
>> Is there any way to "seek" and "skip" with barebox?
> Not directly. What you can do is this:
>
> tftp barebox.bin
> memcpy -s barebox.bin -d /dev/self0 512 0
It's working, but I have to use "1024" instead of "512". Also I have to 
change my partition init from
"devfs_add_partition("disk0", 0x000000, 0x040000, PARTITION_FIXED, 
"self0");"
to
devfs_add_partition("disk0", 0x000400, 0x040000, PARTITION_FIXED, "self0");


Regards,
Thomas

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  reply	other threads:[~2011-04-13  9:28 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-04-08  9:18 Thomas Mayer
2011-04-08 13:21 ` Sascha Hauer
2011-04-13  9:28   ` Thomas Mayer [this message]
2011-04-13  9:51     ` Marc Kleine-Budde
2011-04-13 10:55       ` Thomas Mayer
2011-04-13 11:41         ` Marc Kleine-Budde

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