ROOT 0x00000000
{
    FLASH 0x00000000  ALIGNALL 32
    {
        uart_updata_sys_boot.o (UART_UPDATA_SYS_Boot, +First)
        *(+RO)
    }
    FAST_CALL_SEG +0 ALIGNALL 32
    {
       * (fastcall)
    }

	;if u want to modify the base address of section, you may pay attention to update_image.h
	PEND_FOR_FLASH 0x00400000 EMPTY 0x20
	{
	}
	
    RAM 0x00400020 NOCOMPRESS
    {
        *(+RW,+ZI)		
    }
	
}