Not getting all the memory access I want

Hi, I am trying to test ram, I have setup the MMU using the following code. It would seem I have full access to all the ram, however I get access to 0x80000000-0x80014000 and if I step beyond this the ram test hangs.

A couple of questions shat is the SECTIONS size and why can't I get beyond 0x80014000.

Any help would be good

thanks

DH

#define NUM_OF_IMAGES                         (15u)
#define START_ADDR_DDR             (0x80000000)
#define START_ADDR_DEV             (0x44000000)
#define START_ADDR_OCMC            (0x40300000)
#define NUM_SECTIONS_DDR           (512)
#define NUM_SECTIONS_DEV           (960)
#define NUM_SECTIONS_OCMC          (1)

void MMUConfigAndEnable(void)
{
    /*
    ** Define DDR memory region of AM335x. DDR can be configured as Normal
    ** memory with R/W access in user/privileged modes. The cache attributes
    ** specified here are,
    ** Inner - Write through, No Write Allocate
    ** Outer - Write Back, Write Allocate
    ** START_ADDR_DDR             (0x80000000) 512 sectors
    ** START_ADDR_DEV             (0x44000000)
    ** START_ADDR_OCMC            (0x40300000)
    */
    REGION regionDdr = {
                        MMU_PGTYPE_SECTION, START_ADDR_DDR, NUM_SECTIONS_DDR,
                        MMU_MEMTYPE_NORMAL_NON_SHAREABLE(MMU_CACHE_WT_NOWA,MMU_CACHE_WB_WA),
                        MMU_REGION_NON_SECURE, MMU_AP_PRV_RW_USR_RW,
                        (unsigned int*)pageTable
                       };
    /*
    ** Define OCMC RAM (On Chip Memory Controller) region of AM335x. Same Attributes of DDR region given.
    */
    REGION regionOcmc = {
                         MMU_PGTYPE_SECTION, START_ADDR_OCMC, NUM_SECTIONS_OCMC,
                         MMU_MEMTYPE_NORMAL_NON_SHAREABLE(MMU_CACHE_WT_NOWA, MMU_CACHE_WB_WA),
                         MMU_REGION_NON_SECURE, MMU_AP_PRV_RW_USR_RW,
                         (unsigned int*)pageTable
                        };

    /*
    ** Define Device Memory Region. The region between OCMC and DDR is
    ** configured as device memory, with R/W access in user/privileged modes.
    ** Also, the region is marked 'Execute Never'.
    */
    REGION regionDev = {
                        MMU_PGTYPE_SECTION, START_ADDR_DEV, NUM_SECTIONS_DEV,
                        MMU_MEMTYPE_DEVICE_SHAREABLE, MMU_REGION_NON_SECURE,
                        MMU_AP_PRV_RW_USR_RW  | MMU_SECTION_EXEC_NEVER,
                        (unsigned int*)pageTable
                       };

    /* Initialize the page table and MMU */
    MMUInit((unsigned int*)pageTable);

    /* Map the defined regions */
    MMUMemRegionMap(&regionDdr);
    MMUMemRegionMap(&regionOcmc);
    MMUMemRegionMap(&regionDev);

    /* Now Safe to enable MMU */
    MMUEnable((unsigned int*)pageTable);
}