How to map nand chip ?

[Ricard Wanderlof]

On Thu, 15 Nov 2007, Carlos Munoz wrote:

> When I load the nand driver module, the nand chip is detected correctly
> but it seems all the erase blocks are bad. I wonder if it's caused by
> the wrong timings when accessing the nand chip. However, the
> manufacturer and chip id are read correctly. Does anyone know what may
> be the cause for these errors ?

The timing requirements when reading chip id's are not as severe as when 
actually accessing the memory, so if you are just below the limit, you can 
get the id ok but other things fail.

Another thing that can cause this is if the ready/busy-pin is not read 
properly by the chip driver. Again, the chip will probably respond quickly 
to an id request, but when reading or writing the memory array, the access 
times will be longer causing failure.

/Ricard
--
Ricard Wolf Wanderlöf                           ricardw(at)axis.com
Axis Communications AB, Lund, Sweden            www.axis.com
Phone +46 46 272 2016                           Fax +46 46 13 61 30