MEMORY
{
  FLASH : ORIGIN = 0x00000000, LENGTH = 630K
  SRAM0 : ORIGIN = 0x20000000, LENGTH = 64K
  SRAM1 : ORIGIN = 0x20010000, LENGTH = 64K
  SRAM2 : ORIGIN = 0x20020000, LENGTH = 64K
  SRAM3 : ORIGIN = 0x20030000, LENGTH = 64K
}