[Yaffs] Bad block management

[Aras Vaichas]

Brad Beveridge wrote:
> 
>> I "lost" several NAND chips during my development. I simply hacked the 
>> FLASH erase utilities to ignore the ignore markers and erase the bad 
>> blocks anyway until I got everything working and "rescued" the chips.
> 
> 
> I've done bringup/development work on several boards using different 
> arrangements of NAND.  IMHO, you will "destroy" at least a few chips in 
> early development by having to erase falsely marked bad blocks, and at 
> the same time erasing manufacturer marked blocks.  I've not noticed any 
> significant errors by erasing manufacturer bad blocks, and you shouldn't 
> be too worried about it.  That said - I also wouldn't let any of those 
> "destroyed" chips out into the world in a real product.

I got the electronics engineer to make up some imitation Smartmedia cards, with 
test points and headers for the logic analyser, for me so I could test with our 
actual NAND chips on my development board. Those pesky chips ain't going anywhere!

I guess it's also a good test to see if YAFFS copes with a NAND that has been 
"tampered" with. :)

regards,

Aras