How to place a variable at a given absolute address in memory (with GCC)

Question

The RealView ARM C Compiler supports placing a variable at a given memory address using the variable attribute at(address):

int var __attribute_         


        

Answer 1

You answered your question, In your link above it states:

With the GNU GCC Compiler you may use only pointer definitions to access absolute memory locations. For example:

#define IOPIN0         (*((volatile unsigned long *) 0xE0028000))
IOPIN0 = 0x4;

Btw http://gcc.gnu.org/onlinedocs/gcc-4.5.0/gcc/Variable-Attributes.html#Variable%20Attributes