Why Two SDRAM in AT91RM9200dk used

Hi All,

I am working on a prototype board based on at91rm9200dk.now i have placed
only one SDRAM (16 MB)on my board.I am able to access the sdram and flash
successfully but now after storing the gzip image u-boot.gz in flash when
the  
board get reboot from external flash, it got hanged at 

Uncompressing Image...


I thing it is trying to uncompress the image at the location above 16MB.
So since i have only one SDRAM on board wht changes i have to make in my
code and hardware.

Also plz tell me about the controller pins CFIOW and CFIOR , how they work


Thanks in anticipation,

Pratik

On 2006-03-21, pratikmittal4u <pratikmittal_er@yahoo.com> wrote:
> Hi All,
>
> I am working on a prototype board based on at91rm9200dk.now i have placed
> only one SDRAM (16 MB)on my board.I am able to access the sdram and flash
> successfully but now after storing the gzip image u-boot.gz in flash when
> the  
> board get reboot from external flash, it got hanged at 
>
> Uncompressing Image...
>
The atmel board uses 2 16-bit SDRAM's to get a 32-bit wide bus. If you only
use 1 16-bit device, you will have to change the SDRAM controller settings.
And you probably need to tell your compiler/linker how much memory you have
installed. The AT91Rm9200 datasheet has all the info you need on the
controller. You did connect the SDRAM databus to D0-D15 I hope?

-- 
Stef

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