[ECOS] at91rm9200 Booting/using serial dataflash only, removing parallel flash

["Damian Slee" <damian at commtech dot com dot au>]

Hi, 
given the errata problem with the at91rm9200 #37, where booting from
external parallel flash requires 20ns flash.  As a result people are
using small eeproms or dataflashes to boot from instead, then switching
to parallel flash.  which then boots redboot and so on.
 
i'm thinking about using a big serial dataflash only, with large amounts
of sdram.
 
I think someone has done this with the eb55 atmel board?  Was a while
ago tho.

The following app note descibes this with u-boot.  anyone tried it?  any
issues anyone can think off?
http://www.atmel.com/dyn/resources/prod_documents/doc6067.pdf
 
So does this mean i need a small boot loader like romboot.bin (see pdf)
that gets loaded to internal SRAM first, which will then load RedBoot
(RAM?) from the dataflash into SDRAM, which will then load my
application from dataflash into SDRAM?
 
any one used a dataflash for ecos code storage? any processor
 
as far as redboot and my ecos application is concerned, i have to change
the flash driver from the amd 29lvxxx to an atmel dataflash? anything
else
 
and comment please
thanks,
 
damian
 

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