Flash memory address for OMAPL138

Hi,

I'm currently working in secondary boot loader development for our custom board,

In our doc its saying that the flash memory address starts from 0x6000_0000 .

so that I'm assuming that my UBL will be at the beginning of the Flash memory ,ie at  0x6000_0000.

from the forum i found that the ROM boot loader will load the UBL from flash to the SRAM .

my doubt is how the ROM boot loader knows the address of the flash  if m changing my chip and the Flash memory location changed.

THANK YOU.