SDRAM configuration

Greetings all, I've got a custom AT91RM9200 board Im bringing to life.
Current problem is Im pretty sure I've configured the SDRAM correctly,
however writing to address 0x2000FFFF generates the following on the
terminal:
(Im running romboot.bin)

-F- Data Abort detected

I've tested the flash and it does work. Im almost positive I have just
missed a mundane register, anything jump out at you that would cause a
"Data Abort" by writing to the above address?
-Alex

"roboman152" <amstewa2@ncsu.edu> writes:

> Greetings all, I've got a custom AT91RM9200 board Im bringing to life.
> Current problem is Im pretty sure I've configured the SDRAM correctly,
> however writing to address 0x2000FFFF generates the following on the
> terminal:
> (Im running romboot.bin)
>
> -F- Data Abort detected
>
> I've tested the flash and it does work. Im almost positive I have just
> missed a mundane register, anything jump out at you that would cause a
> "Data Abort" by writing to the above address?

Sounds like you are writing a 16 or 32 bit quantity to an unaligned
address. I think you will find that the address has to be a multiple
of the number of bytes in the item written (or read). I.e. single
bytes can be accessed from any address, 16 bit words from any even
address, 32 bit words from any address that is a multiple of 4.


-- 

John Devereux