Flash can't not erase and write when a table in code

[gandyhuang]

hi

i use the example flashwriting in nRF5_SDK_15.3.0_59ac345, i set a table at 0xfd000:

// ProgramSection alignment="4" keep="Yes" load="yes" name=".tabletest" address_symbol="__tabletest_start" end_symbol="__tabletest_end"  start="0x000fd000" size="0x1000"

uint8_t const testtable[] __attribute__((section(".tabletest"))) __attribute__((used))={0xff,0xff,0xff,0xff}; 

//the test code in main.c 

uint8_t const testtable[] __attribute__((section(".tabletest"))) __attribute__((used))={0xff,0xff,0xff,0xff};
int main(void)
{
    uint32_t err_code;

    APP_ERROR_CHECK(NRF_LOG_INIT(NULL));

    err_code = app_timer_init();
    APP_ERROR_CHECK(err_code);

    err_code = clock_config();
    APP_ERROR_CHECK(err_code);



    flash_page_init();
    nrf_nvmc_write_word((uint32_t) &testtable,0);             //wirte 0xfd000 fail
    nrf_nvmc_page_erase((uint32_t) &testtable);               //erase 0xfd000 fail

but the if don't load the table 1st, it can work well

// ProgramSection alignment="4" keep="Yes" load="No" name=".tabletest" address_symbol="__tabletest_start" end_symbol="__tabletest_end"  start="0x000fd000" size="0x1000"

uint8_t const testtable[] __attribute__((section(".tabletest"))) __attribute__((used))={0xff,0xff,0xff,0xff};
int main(void)
{
    uint32_t err_code;

    APP_ERROR_CHECK(NRF_LOG_INIT(NULL));

    err_code = app_timer_init();
    APP_ERROR_CHECK(err_code);

    err_code = clock_config();
    APP_ERROR_CHECK(err_code);



    flash_page_init();
    nrf_nvmc_write_word((uint32_t) &testtable,0);             //wirte OK
    nrf_nvmc_page_erase((uint32_t) &testtable);               //erase Ok

so, why it's can't write and erase when set

load="yes" ?

[Simonr]

Hi

I can't see anything wrong right off the bat with your main file. Have you made any other changes than adding the .testtable and the write/erase commands to the main.c file? Please double check that you've configured the flash_placement.xml file correctly as well. This is very well described by a SEGGER employee in this case.

Best regards,

Simon

[gandyhuang]

HI,

I had used NRF_LOG_INFO to print out the data, and the result was right. I think it's caused by the SEGGER Embedded Studio. Thanks you very much!

    nrf_nvmc_write_word((uint32_t) &testtable,0);             //wirte Ok
    memcpy(&a,(const uint8_t *) 0xfd000,4);
    NRF_LOG_INFO("\r\n 1:%d",a);
    UNUSED_RETURN_VALUE(NRF_LOG_PROCESS());

    nrf_nvmc_page_erase((uint32_t) &testtable);               //erase OK
    
    memcpy(&b,(const uint8_t *) 0xfd000,4);
    NRF_LOG_INFO("\r\n 2:%d",b);
    UNUSED_RETURN_VALUE(NRF_LOG_PROCESS());