This will most lokalu not help. 
Try my hacking branch of linaro-image-tools. I had the same problem as you and 
I added a workaround.

Sorry for the brevity, I'm on holiday + phone

Wysłane z iPhone'a

Dnia 07-03-2011 o godz. 14:03 Loïc Minier <loic.min...@linaro.org> napisał(a):

> On Mon, Mar 07, 2011, Shawn Guo wrote:
>> proc umounted
>> /dev/sdb: No medium found
>> 
>> sfdisk: cannot open /dev/sdb read-write
> 
> Hmm that's really bad; the only thing that I can think of is that your
> device goes away for some time after the empty partition table is
> created, and so the sfdisk call comes too soon; could you try this on
> your MMC:
>    parted -s /dev/sdN mklabel msdos && sfdisk -L /dev/sdN
> if sfdisk fails when called immediately after parted, it probably means
> we have to poll for readyness of /dev/sdN before calling sfdisk.
> 
>   Thanks!
> -- 
> Loïc Minier
> 
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