Placing a range of variables in external ram

Hi I have CortexM4 with external ram, since the external ram is slower than internally, I would like to have the possibility to place a variable in external ram. But I don't wan't to specify a exact...
Placing a range of variables in external ram

Hi I have CortexM4 with external ram, since the external ram is slower than internally, I would like to have the possibility to place a variable in external ram. But I don't wan't to specify a exact...
How to define a variable at external RAM?

if the CARM compiler have the key word define the external data just like "xdata" in 51?
How to define a variable at external RAM?

if the CARM compiler have the key word define the external data just like "xdata" in 51?
Variable at fix address

How to locate 1) structure 2) array of structure 3) any variable like char,int,long to a specific memory location and how declare its extern prototype regards... Yogesh.