olimex sam9260 memory read-write code

Development Boards MicroMod
1

I want to write at91bootstrap code to dataflash using openocd.

I can use the command load_image at91bootstrap.bin 0x20000 - which is SRAM0 - and can use my code until board plugged to power supply

But I am not able to write to dataflash with openocd , actually I dont understand which memory address for dataflash.

Do you have any experience with olimex sam9260

Thanks.