[U-Boot-Users] Flash Replacement for AT91RM9200-EK

[Liu Dave-r63238]

> Hello List,
> i use a custom Board based on the AT91RM9200-EK.
> Now i want to Replace the Nor Flash AT49BV6416 by a larger 
> one from Spanion.
> The older Atmel chip specifies 70ns Access Time, the most 
> usual Spanion chips are slower in the 100ns Range.

Are you still using static memory controller? 

> As i read the CPU Datasheet correct at 60MHz EBI Speed the 
> slowest Factor 1/4 gives 67ns Cycle Time.
Is the 67ns BFC clock cycle time? I think so.

> Does anyone know, how Access Time for the parallel Flash is 
> calculated and what Speed Grade is needed for a stable U-Boot 
> out of it ?

please refer to datasheet about access time's description.

> Could a slower (100ns) Chip be used, how can this be adjusted ?
> Are there any additional Parameters for the Flash Chip to 
> care of (Burst Mode, Multi Bank) ?

I think the controller should support 100ns chip,  if the timing is not
enough,
You can insert wait cycle for the access?

-Dave