Re: Update barebox on mmc without touching partition table

[Marc Kleine-Budde <mkl@pengutronix.de>]

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On 04/13/2011 11:28 AM, Thomas Mayer wrote:
>>> 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");

what about using:

memcpy -s barebox.bin -d /dev/self0 1024 1024

Marc
-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


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