AM4377: Saving data in NOR flash in XIP mode

Tool/software: TI-RTOS

Hi,

I made a custom board works with SYS/BIOS on XIP(but exactly same as IDK, except part suffix..(I'm using MX66L51235F'Z2I'.)

Because I use XIP, I can't use Board_readFlashStorage(), Board_writeFlashStorage() and the fuctions in qspi_lib.c.

I need to save some data in the board, so I tested this code.

main()

...
        *(volatile int*)(0x3001F000) += 1;

...

BIOS_start();

...

Task()

{

while(1)
        CONSOLEUtilsPrintf("%4u\t", *(volatile int*)(0x3001F000));

}

...

I expected count value increase when re-powering, but it has the value 0.

Should I do something before flash writing? If so, how could I do that without library functions?

I read about 3/4-byte address mode setting things, but it is so confusing me..(destination address is lower than 0xFFFFFF..)

(How could I send a command to flash? I'm using flash memory all time, and the code is in flash memory, isn't there something to be wrong?)

I used memcpy() function like this, but the data isn't saved(but it seems to succeeded before power-off, the data goes away after power-on.)

memcpy((volatile int*)destination, (char*)data, datasize);

I couldn't use L3 build because application size exceed the RAM size..

Thank you,

YK.