[U-Boot] PATCH: bugfix for nand erase failure with bad blocks

[Scott Wood <scottwood@freescale.com>]

Michele De Candia (VT) wrote:
>> I'm a little uneasy about changing the normal erase command from size 
>> to end
>> -- it would break existing uses.  Though, it would make it consistent 
>> with
>> the NOR erase command.  Perhaps a period where it warns but accepts 
>> anyway a
>> size, if the second parameter is less than the first.
>>   
> 
> This doesn't work always: for example, when you erase at the NAND begin, 
> second parameter could be greater than first one.

Hmm... perhaps check the alignment?  If "end" is supposed to be the last 
to-be-erased byte, not the first not-to-be-erased byte, then if the low 
bits are 0 it's a size (and gets a warning) and if they're 1 it's an end?

Or just always use the new syntax, announce it loudly, and grep the 
board config files for scripts to update.  Or leave it alone and only 
change the plus variant.  :-)

> It can always warn user when he uses the first erase way.

Then what would be the correct, non-warning-producing way to erase a 
region of flash regardless of its bad block content?

-Scott