MEMORY
{
  /* NOTE K = KiBi = 1024 bytes */
  FLASH : ORIGIN = 0x08000000, LENGTH = 1M 
  RAM : ORIGIN = 0x20000000, LENGTH = 128K
  CCRAM : ORIGIN = 0x10000000, LENGTH = 64K
}

_stack_start = ORIGIN(RAM) + LENGTH(RAM);