RTOS/CC1310: Task Stack in GPRAM Problem

Part Number:CC1310

Tool/software:TI-RTOS

Hi all,

I have data transmission on UART and radio. When I move task stack of Uart read task to GPRAM, data cannot be read from UART. Are there any restrictions about GPRAM (is it not like a SRAM?)?

I move the stack with the following code.

#define FLASH_BASE              0x0
#define FLASH_SIZE              0x20000
#define RAM_BASE                0x20000000
#define RAM_SIZE                0x5000
#define GPRAM_BASE              0x11000000
#define GPRAM_SIZE              0x2000



/* System memory map */

MEMORY
{
    /* Application stored in and executes from internal flash */
    FLASH (RX) : origin = FLASH_BASE, length = FLASH_SIZE
    /* Application uses internal RAM for data */
    SRAM (RWX) : origin = RAM_BASE, length = RAM_SIZE

    GPRAM (RWX) : origin = GPRAM_BASE, length = GPRAM_SIZE
}

/* Section allocation in memory */

SECTIONS
{
    .text           :   > FLASH
    .binit	        :   > FLASH
    .const          :   > FLASH
    .constdata      :   > FLASH
    .rodata         :   > FLASH
    .cinit          :   > FLASH
    .pinit          :   > FLASH
    .init_array     :   > FLASH
    .emb_text       :   > FLASH
    .ccfg           :   > FLASH (HIGH)

    .data           :   > SRAM
    .gpram 			:   > GPRAM
    {
    tsch.obj(*freqTable)// this is static array
    uartTask.obj(*interTaskStack)	// task stack of Uart read task
    uartTask.obj(*mailboxBuffer)
    }
    .bss            :   > SRAM
    .sysmem         :   > SRAM
    .stack          :   > SRAM (HIGH)
    .nonretenvar    :   > SRAM
#ifdef __TI_COMPILER_VERSION__
#if __TI_COMPILER_VERSION__ >= 15009000
/*  Hide section from older compilers not supporting the "ramfunc" attribute.
    See processors.wiki.ti.com/.../Placing_functions_in_RAM */
    .TI.ramfunc : {} load=FLASH, run=SRAM, table(BINIT)
#endif
#endif
}

What can be the problem about GPRAM and task stacks?

Regards.

Ramazan