m_data is over flowed by 50k bytes MPC 5777M

[yalamandadosaky]

Hi All, I am getting one error is m_data is over flowed by some 50k bytes, So as per one of the post in nxp community , I increased m_data section in 57xx_flash.ld file to 50k to the existing m_data which is (128k + 50k). So I am able to compile it , but when i flashed the code on to mpc5777m board , it is not at all working  and I am able to see the error _stack_end at

This is my linker file

/* Entry Point */
ENTRY(_start)

/* define heap and stack size */
__HEAP_SIZE            = 0 ;
__STACK_SIZE           = 4096 ;

/* Define Flash Base Address */
FLASH_SIZE =  2560K;    
FLASH_BASE_ADDR = 0x01000000;

/* Define SRAM Base Address */
/*SRAM_SIZE =  128K;*/
SRAM_SIZE =  178K;    (added 50k here)
SRAM_BASE_ADDR = 0x40000000;

/* Define Caching Inhibited RAM Base Address */
MPU_NOCACHE_SIZE = 8K;
/*MPU_NOCACHE_BASE_ADDR = 0x4001E000;*/
MPU_NOCACHE_BASE_ADDR = 0x4017B4E0;
/* Define CPU0 Local Instruction SRAM Base Address */
LOCALIMEM_SIZE = 16K;
LOCALIMEM_BASE_ADDR = 0x50000000;

/* Define CPU0 Local Data SRAM Base Address */
LOCALDMEM_SIZE = 64K;
LOCALDMEM_BASE_ADDR = 0x50800000;

    
MEMORY
{

    flash_rchw : org = 0x00FC0000,   len = 0x4
    cpu0_reset_vec : org = 0x00FC0000+0x10,   len = 0x4
    cpu1_reset_vec : org = 0x00FC0000+0x14,   len = 0x4
    cpu2_reset_vec : org = 0x00FC0000+0x04,   len = 0x4    
    cpuc_reset_vec : org = 0x00FC0000+0x18,   len = 0x4    
        
    m_text :    org = 0x1000000, len = 2560K  
    m_data :    org = 0x40000000,   len = 178K
    m_data_nocache :    org = 0x4017B4E0,   len = 8K
    
    int_iram  : org = 0x50000000,   len = 16K
    int_dram  : org = 0x50800000,   len = 64K   
}

I am not getting , how to solve this problem , can any one help me ?

[martin_kovar]

Hi,

Have you created single-core or multi-core project? If you create multi-core project, could you please send me linker files for all cores?

Regards,

Martin

[yalamandadosaky]

Hi I have two cores one is z7_0 and z4_2 . the one is which is posted in first query is for Z7_0 and for the z4_2 is given below :

/* Entry Point */
ENTRY(_start)

/* define heap and stack size */
__HEAP_SIZE            = 0 ;
__STACK_SIZE           = 4096 ;

SRAM_SIZE =  128K;    
/* Define SRAM Base Address */
SRAM_BASE_ADDR = 0x40040000;
 
/* Define CPU2 Local Instruction SRAM Allocation */  
LOCALIMEM_SIZE = 16K;
/* Define CPU2 Local Instruction SRAM Base Address */
LOCALIMEM_BASE_ADDR = 0x52000000;

/* Define CPU2 Local Data SRAM Allocation */
LOCALDMEM_SIZE = 64K;
/* Define CPU2 Local Data SRAM Base Address */
LOCALDMEM_BASE_ADDR = 0x52800000;
    
MEMORY
{

    flash_rchw : org = 0x00FC0000,   len = 0x4
    cpu0_reset_vec : org = 0x00FC0000+0x10,   len = 0x4
    cpu1_reset_vec : org = 0x00FC0000+0x14,   len = 0x4
    cpu2_reset_vec : org = 0x00FC0000+0x04,   len = 0x4    
    cpuc_reset_vec : org = 0x00FC0000+0x18,   len = 0x4    
        
    m_text :    org = 0x1500000, len = 2560K  
    m_data :    org = 0x40040000,   len = 128K
    
    int_iram  : org = 0x52000000,   len = 16K
    int_dram  : org = 0x52800000,   len = 64K   
}

[martin_kovar]

Hi,

just a quick hint. This line in linker file seems to be incorrect. MPU_NOCACHE_BASE_ADDR = 0x4017B4E0; You started your SRAM at address 0x40000000 and length is 178KB, so address range is 0x40000000 - 0x4002C800.

From the picture you shared it seems, you got Data Storage exception and the incorrect address could be the root cause of this exception.

Regards,

Martin

[yalamandadosaky]

Hi Martin, I am able to run the code on the board only after increasing SRAM size to 256k, but only two tasks are  running , we have three tasks in my code (micrium rtos tasks). So I disable one task. Can I increase to some more ( to 300k) but MPC5777M data sheet tells onchip SRAM is 404KB , I have two cores running ,one (Z4_2) I configured 128KB SRAM and   another one Z7_0 for 256KB.

To what extent I can increase SRAM size or any other option to get rid off this ?b55689

[martin_kovar]

Hi,

unfortunately, I do not know Micrium RTOS, but you have only one possible way. If you do not have enough memory for operating system, you can decrease the SRAM size for Z4 core (if you do not need all 128K for Z4 core).

Otherwise you have to optimize your core.

Regards,
Martin

[yalamandadosaky]

Hi Martin Thank you ,I will check it.b55689

[yalamandadosaky]

Thank you I got it ,Actually I am multiplying (178KB) 178*1024 in hexadecimal .

I will check the same.