Need to declare variables in external SDRAM as well in the internal RAM.

[billbrown]

I am using an LPC2468 processor with external SDRAM starting at address 0xa000000 in addition to the the processors built in RAM.  I am using Kiel uVision.  I need to define variables in both address spaces.  

Do I need to define each variable using the __attribute__ modifier?  If so, how?

Is there a way to say, from here until I say otherwise use this memory space or the other ?  Or does each variable need its own qualifier?  

I have played with the scatter allocation file but looking at the map file variables are still allocated in unexpected places/

Thanks

[converse]

Kiel docs how to do this

ARM: LOCATING VARIABLES AT ABSOLUTE MEMORY ADDRESSES 

[CarlosCasillas]

Hi Bill,

You could take a look at the following links, which seems to be related to what are you trying:

https://www.lpcware.com/content/forum/allocating-dynamic-memory-external-sdram

https://www.lpcware.com/content/forum/could-i-use-extern-sdram-ram

https://community.nxp.com/thread/429937

Hope this will be useful for you.
Best regards!
/Carlos
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------