MEMORY {
    HEADER (rx): ORIGIN = 0x10000000, LENGTH = 0x200
    FLASH (rx) : ORIGIN = 0x10000200, LENGTH = 0x002FFE00 /* 3MB flash */
    SRAM (rwx) : ORIGIN = 0x20000000, LENGTH = 0x00100000 /* 1MB SRAM */
}

/* Added Oct 9, 2018 to go to correct reset vector. */
ENTRY(Reset_Handler)
PROVIDE( _start_SWAP = (((Reset_Handler) >> 24) | (((Reset_Handler) & 0x00FF0000) >> 8) | (((Reset_Handler) & 0x0000FF00) << 8) | ((Reset_Handler) << 24)));
PROVIDE_HIDDEN( _SLA_Size = _endimage - __end_header );
PROVIDE( _SLA_Size_SWAP = (((_SLA_Size) >> 24) | (((_SLA_Size) & 0x00FF0000) >> 8) | (((_SLA_Size) & 0x0000FF00) << 8) | ((_SLA_Size) << 24)));

/* Sections Definitions */
SECTIONS {
     .sb_sla_header : ALIGN(4)
    {
       FILL(0xFF)
        KEEP(*(.sb_sla_header)) /* Header for ROM code */
         __end_header = . ;
        . = ALIGN(512);
    } > HEADER

    .text :
    {
        _text = .;
        KEEP(*(.isr_vector))
        *(.text*)    /* program code */
        *(.rodata*)  /* read-only data: "const" */

        KEEP(*(.init))
        KEEP(*(.fini))

        /* C++ Exception handling */
        KEEP(*(.eh_frame*))
        _etext = .;
    } > FLASH

    /* it's used for C++ exception handling      */
    /* we need to keep this to avoid overlapping */
    .ARM.exidx :
    {
        __exidx_start = .;
        *(.ARM.exidx*)
        __exidx_end = .;
    } > FLASH

    .data :
    {
        _data = ALIGN(., 4);
        *(.data*)           /*read-write initialized data: initialized global variable*/
        *(.spix_config*)    /* SPIX configuration functions need to be run from SRAM */
        *(.flashprog*)      /* Flash program */


        /* These array sections are used by __libc_init_array to call static C++ constructors */
        . = ALIGN(4);
        /* preinit data */
        PROVIDE_HIDDEN (__preinit_array_start = .);
        KEEP(*(.preinit_array))
        PROVIDE_HIDDEN (__preinit_array_end = .);

        . = ALIGN(4);
        /* init data */
        PROVIDE_HIDDEN (__init_array_start = .);
        KEEP(*(SORT(.init_array.*)))
        KEEP(*(.init_array))
        PROVIDE_HIDDEN (__init_array_end = .);

        . = ALIGN(4);
        /* finit data */
        PROVIDE_HIDDEN (__fini_array_start = .);
        KEEP(*(SORT(.fini_array.*)))
        KEEP(*(.fini_array))
        PROVIDE_HIDDEN (__fini_array_end = .);

        _edata = ALIGN(., 4);
    } > SRAM AT>FLASH
    __load_data = LOADADDR(.data);
    _enddata = LOADADDR(.data)+SIZEOF(.data);

    .sb_sla_trailer : AT(_enddata)
    {
        KEEP(*(.sb_sla_trailer))
        /* Align image with 16 byte boundary to conform to flash encryption block size. */
        FILL(0xDEADC0DE);
        /* NOTE: The FILL and ALIGN will not work unless something is written to the section.  So, we use LONG. */
        LONG(0xDEADC0DE);
        . = ALIGN(16);
    }  > FLASH
    _endimage = LOADADDR(.sb_sla_trailer)+SIZEOF(.sb_sla_trailer);
    .sig :
    {
        KEEP(*(.sig))
        LONG(0xDEADBEEF);

    }  > FLASH
    .bss :
    {
        . = ALIGN(4);
        _bss = .;
        *(.bss*)     /*read-write zero initialized data: uninitialized global variable*/
        *(COMMON)
        _ebss = ALIGN(., 4);
    } > SRAM

    /* Set stack top to end of RAM, and stack limit move down by
     * size of stack_dummy section */
    __StackTop = ORIGIN(SRAM) + LENGTH(SRAM);
    __StackLimit = __StackTop - SIZEOF(.stack_dummy);

    /* .stack_dummy section doesn't contains any symbols. It is only
     * used for linker to calculate size of stack sections, and assign
     * values to stack symbols later */
    .stack_dummy (COPY):
    {
        *(.stack*)
    } > SRAM

    .heap (COPY):
    {
        . = ALIGN(4);
        PROVIDE ( end = . );
        PROVIDE ( _end = . );
        *(.heap*)
        __HeapLimit = ABSOLUTE(__StackLimit);
    } > SRAM

    PROVIDE(__stack = __StackTop);

    /* Check if data + heap + stack exceeds RAM limit */
    ASSERT(__StackLimit >= _ebss, "region RAM overflowed with stack")
}