question about how to re-flash the XO

[Mitch Bradley]

> Suppose I have a file 'foobar.img' on an USB stick.  On an unsecured 
> XO, I'm at the 'ok' prompt.  What is the difference between using 
> 'copy-nand u:\foobar.img' versus using 'update-nand u:\foobar.img" ??
>
> Thanks,  mikus
>   

update-nand performs the secure update procedure that uses "fs.zip" as 
the source file.  It supports creating partitioned images via the 
command mechanism defined in 
http://wiki.laptop.org/go/OFW_NAND_FLASH_Updater

copy-nand performs a simplified non-secure update that uses "foo.img" 
and "foo.crc" as the source file.  It just blasts the raw data onto the 
NAND, block by block.