S32K144 - flash erase/write problem with S32DS and variable at specific location

[Novalis]

Hi,

I have new section defined in linker file

cfgdata                  (RW)  : ORIGIN = 0x00016000, LENGTH = 0x00001000

.cfgdata :
   {
    . = ALIGN(4);                 
    *(.cfgdata)
    . = ALIGN (0x4);
   } > cfgdata

in sourcecode:

uint8_t tmpdata[8] __attribute__((section(".cfgdata"))) ={7,6,5,4,3,2,1,0} ;

after startup I call this function:

void test_write()

{

   uint8_t data[8]={0,1,2,3,4,5,6,7};

   uint8_t newdata[8];
   uint32_t addr=0x16000;
   uint32_t ret = FLASH_DRV_Init(&Flash1_InitConfig0, &flashSSDConfig2);
   ret = FLASH_DRV_EraseSector(&flashSSDConfig2, addr, 4096u);
   ret = FLASH_DRV_Program(&flashSSDConfig2, addr, 8, data);

   memcpy(newdata,tmpdata,8);

}

when I check memory map , I see 76543210  at addr 0x16000 at startup
when I do FLASH_DRV_EraseSector, it's still there, EraseSector function returns 0, that is success, so why is it not erased?
when I do FLASH_DRV_Program, which also returns 0/success , still old data there ..

BUT!

when I do  memcpy(newdata,tmpdata,8);  then I have  01234567 bytes in newdata variable ...
BUT - after program reset, I still only see old 76543210 in memory map at tmpdata location ...

When I define tmpdata without specific location (or force it into another location I have configured),

uint8_t tmpdata[8]  ={7,6,5,4,3,2,1,0} ;

then erase/flash write is working fine, I can see data at 0x16000 being erased, then written

Does anybody have any idea why this is happening?

[Alexis_A]

Hello Martin,

Have you tried defining the structure in that location without initializing it? I think this could be due to the interpretation the compiler is doing about initializing the structure as a dependant address global variable.

Best Regards,

Alexis Andalon

[Novalis]

Hi Alexis,
I need it initialized, because it's part of bootloader and I need to know the data at the startup, I cannot assign them in runtime, because I will be overwriting this area by Cyclone programmer if necessary (but it should use defaults written by JTAG when flashing bootloader for the first time).

But anyway I tried it and just did

uint8_t tmpdata[8] __attribute__((section(".cfgdata"))) ;

and in main()
tmpdata[0]=7;

tmpdata[1]=6;

tmpdata[2]=5;

tmpdata[3]=4;

tmpdata[4]=3;

tmpdata[5]=2;

tmpdata[6]=1;

tmpdata[7]=0;

but it crashes (jumps into defaultISR) on the second line (because I am trying to write into flash area, not ram may be)

Still I don't understand what compiler has to do with MCU instruction for erasing flash/writing phrase into flash. This was working fine on MCF51JM.

[Alexis_A]

Hello Martin,

Did you try using the flash write command instead of writing directly to the array?

Best Regards,

Alexis Andalon

[Novalis]

Hi Alexis,
it's the same as at the beginig - FLASH_DRV_EraseSector returns 0, FLASH_DRV_Program returns 0, but flash is not erased nor written. 

BTW: I should have written, that I am using J-Link EDU

Because now I also tried PEmicro Cyclone FX and it seems to be working fine ... so much time wasted because of that stupid J-Link EDU