RTOS/CC2650STK: How can i use big buffer?

Part Number: CC2650STK
Other Parts Discussed in Thread: CC2650

Tool/software: TI-RTOS

Hello, Ti dev team.

I using main board CC2650 and we company make in board.

make board in spi nand flash, Spi communication is ok (Read Company id and register etc...)

but we have problem read/write Page... spi nand flash page size for 2048.

Memory is sufficient before declaring an array.

Declaring an array 'uint8_t flash_buffer[2048];'  

CCS project  build ok but not working board

Before declaring available memory is 3463 Byte.

declaring 2048byte available memory is 1415 Byte.

I tried many things.

1. change predefine symbol 'HEAPMGR_SIZE=0 ' -> 'HEAPMGR_SIZE=2100'

2.  change app_ble.cfg file change BIOS.heapSize = 1668 -> 3716

3. change app_ble.cfg file change heapMinParams.size = 1668; -> 3716

4. try to 'Memory_alloc' function SYS/BIOS (TI-RTOS Kernel) v6.46 User guide '7.7.3 Using the xdc.runtime.Memory Module' 

All failed.

How can i use big buffer?

in ccs project in c source include 

/*********************************************************************
 * LOCAL VARIABLES
 */
uint32_t udAddr = 0;
uint8_t flash_buf[PAGE_DATA_SIZE] = {0,}; //edit kevin.ko test Nandflash page size 2048;
//uint8_t *flash_buf;

while (true) // in _TaskFxn task...
{
if (file_transfer_Config == ST_CFG_SENSOR_ENABLE)
{
Log_info0("file_transfer_TaskFxn");
// for(int i=0; i<PAGE_DATA_SIZE; i++)
// {
// flash_buf[i] = i%16;
// Log_info2("flash_buf[%d][%d]",i,flash_buf[i]);
// }
// Error_Block eb;
// flash_buf = Memory_alloc(NULL, 128, 0, &eb);
// if (flash_buf == NULL) {
// Log_info0("Memory allocation for buf1 failed");
// }
// Log_info0("Memory allocation for buf1 not failed");
// for(int i=0; i<512; i++)
// *(flash_buf+i) = i%16;
// for(int i=0; i<PAGE_DATA_SIZE; i++)
// *(flash_buf+i) = i%16;
// ExtNandFlash_PageProgram(udAddr,flash_buf,PAGE_DATA_SIZE);
// memset(flash_buf,0x00,PAGE_DATA_SIZE);
// ExtNandFlash_PageRead(udAddr,flash_buf);
// for(int i=0; i<PAGE_DATA_SIZE; i++)
// Log_info1("flash_buf[i]=[0x%02x]",*(flash_buf+i));
//
// memset(flash_buf,0x00,PAGE_DATA_SIZE);
// Memory_free(NULL, flash_buf, 512);


// for(int i=0; i<PAGE_DATA_SIZE; i++)
// flash_buf[i] = i%16;
// ExtNandFlash_PageProgram(udAddr,flash_buf,PAGE_DATA_SIZE);
// memset(flash_buf,0x00,PAGE_DATA_SIZE);
// ExtNandFlash_PageRead(udAddr,flash_buf);
// for(int i=0; i<PAGE_DATA_SIZE; i++)
// Log_info1("flash_buf[i]=[0x%02x]",flash_buf[i]);
// memset(flash_buf,0x00,PAGE_DATA_SIZE);


DELAY_MS(SENSOR_DEFAULT_PERIOD);
}

ccs project is not build.