Update barebox on mmc without touching partition table
tm.telemotive at gmx.de
Wed Apr 13 05:28:33 EDT 2011
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:
>> 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,
devfs_add_partition("disk0", 0x000400, 0x040000, PARTITION_FIXED, "self0");
More information about the barebox