Update barebox on mmc without touching partition table

Thomas Mayer tm.telemotive at gmx.de
Wed Apr 13 06:55:44 EDT 2011

Hi Marc,

Am 13.04.2011 11:51, schrieb Marc Kleine-Budde:
> 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
works too, with partition from 0x00000 to 0x040000.


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