How to read from a onchip memory

if you use uClinux no-mmu .......

#include <stdio.h>
# define BUFFER_MEMORY 0x10000000# define IORD(address, offset) (*(volatile unsigned *)(((address)| 0x80000000)+4*(offset)))
# define IOWR(address, offset, value) (*(volatile unsigned *)(((address)|0x80000000)+4*(offset)))=(value)
int main()
{
int op;
int valor;
int temp;
while (1) {
    
 printf("\n\n\nDIGITE A OPCAO\n");
 printf("1 - ESCREVER\n");
 printf("2 - LER\n");
 scanf("%d",&op);
 
 if (op == 1) {
 printf("DIGITE O VALOR\n");
 scanf("%x", &valor);
 printf("ESCREVENDO %x\n", valor);
 IOWR(BUFFER_MEMORY, 2, valor);
 //IOWR(0x00041040, 0, valor);
 }
 else if (op == 2) {
    
 printf("LENDO\n");
 temp=IORD(BUFFER_MEMORY, 0X2);
 printf("temp = %x\n", temp);
 }
 else {
 printf("OPCAO INVALIDA\n\n");
 }
 
}
  return 0;
}