Subversion Repositories openrisc_me

SRAM_ORIGIN=0x03000000

SRAM_LENGTH=0x00100000

# HEAPEND must be in the same memory region as DATA.  STACK should be

# above HEAPEND, also in the same region, for configurations which

# need __stack.

case $MODE in

    rom)

        CRT0=rom

        TEXT=rom

        DATA=sram

        DATALOAD="rom"

        STACK=0x030ffffc

        HEAPEND=0x03080000

        ;;

    sram)

        CRT0=ram

        TEXT=sram

        DATA=sdram

        STACK=0x021ffffc

        HEAPEND=0x02180000

        # Leave the rest of SDRAM for manual use.

        ;;

    sdram)

        CRT0=ram

        TEXT=sdram

        DATA=sdram

        STACK=0x021ffffc

        HEAPEND=0x02180000

        # Leave the rest of SDRAM for manual use.

        ;;

    redboot)

        CRT0=redboot

        # We need to avoid the area used by RedBoot

        SRAM_ORIGIN=0x3080000

        SRAM_LENGTH=0x80000

        # Put code for RedBoot apps in SRAM, since the fido1100 has

        # trouble running code from SDRAM.

        TEXT=sram

        DATA=sdram

        STACK=0

        HEAPEND=0x027f0000

        ;;

    *)

        ERROR

        ;;

esac

cat <

/*

 * Setup the memory map of the Innovasic SBC

 * stack grows down from high memory.

 *

 * The memory map for the ROM model looks like this:

 *

 * +--------------------+ <-address 0 in Flash

 * | .vector_table      |

 * +--------------------+ <- low memory

 * | .text              |

 * |        _etext      |

 * |        ctor list   | the ctor and dtor lists are for

 * |        dtor list   | C++ support

 * +--------------------+

 * | DCACHE_CODE        | code to be loaded into DCACHE

 * |     _dcache_start  |

 * |     _dcache_end    |

 * +--------------------+

 * | .data              | initialized data goes here

 * +--------------------+

 * .                    .

 * .                    .

 * .                    .

 * +--------------------+ <- The beginning of the SRAM area

 * | .data              | a wriable copy of data goes here.

 * |        _edata      |

 * +--------------------+

 * | .bss               |

 * |        __bss_start | start of bss, cleared by crt0

 * |        _end        | start of heap, used by sbrk()

 * |        _heapend    |    End   of heap, used by sbrk()

 * +--------------------+

 * .                    .

 * .                    .

 * .                    .

 * |        __stack     | top of stack

 * +--------------------+

 *

 *

 * The memory map for the RAM model looks like this:

 *

 * +--------------------+ <- The beginning of the SRAM or SDRAM area.

 * | .vector_table      |

 * +--------------------+ <- low memory

 * | .text              |

 * |        _etext      |

 * |        ctor list   | the ctor and dtor lists are for

 * |        dtor list   | C++ support

 * +--------------------+

 * | DCACHE_CODE        | code to be loaded into DCACHE

 * |     _dcache_start  |

 * |     _dcache_end    |

 * +--------------------+

 * | .data              | initialized data goes here

 * |        _edata      |

 * +--------------------+

 * | .bss               |

 * |        __bss_start | start of bss, cleared by crt0

 * |        _end        | start of heap, used by sbrk()

 * |        _heapend    |    End   of heap, used by sbrk()

 * +--------------------+

 * .                    .

 * .                    .

 * .                    .

 * |        __stack     | top of stack

 * +--------------------+

 */

STARTUP(fido-${CRT0}-crt0.o)

OUTPUT_ARCH(m68k)

ENTRY(_start);

GROUP(-l${IO} -lfido -lc -lgcc)

MEMORY {

  /* Flash ROM.  */

  rom (rx)      : ORIGIN = 0x0000000, LENGTH = 0x800000

  /* Internal SRAM.  */

  int_ram (rwx) : ORIGIN = 0x1000000, LENGTH = 0x6000

  /* External SDRAM.  */

  sdram (rwx)   : ORIGIN = 0x2000000, LENGTH = 0x800000

  /* External SRAM.  */

  sram (rwx)     : ORIGIN = ${SRAM_ORIGIN}, LENGTH = ${SRAM_LENGTH}

}

SECTIONS {

  /* The interrupt vector is placed at the beginning of ${TEXT},

     as required at reset.  */

  .vector_table : {

    *(.vector_table)

  } > ${TEXT}

  /* Text section.  */

  .text :

  {

    *(.text .text.*)

    *(.gnu.linkonce.t.*)

    . = ALIGN(0x4);

    /* These are for running static constructors and destructors under ELF.  */

    KEEP (*crtbegin.o(.ctors))

    KEEP (*(EXCLUDE_FILE (*crtend.o) .ctors))

    KEEP (*(SORT(.ctors.*)))

    KEEP (*crtend.o(.ctors))

    KEEP (*crtbegin.o(.dtors))

    KEEP (*(EXCLUDE_FILE (*crtend.o) .dtors))

    KEEP (*(SORT(.dtors.*)))

    KEEP (*crtend.o(.dtors))

    . = ALIGN(0x4);

    KEEP (*crtbegin.o(.jcr))

    KEEP (*(EXCLUDE_FILE (*crtend.o) .jcr))

    KEEP (*crtend.o(.jcr))

    *(.rodata .rodata.*)

    *(.gnu.linkonce.r.*)

    *(.gcc_except_table)

    *(.eh_frame)

    . = ALIGN(0x2);

    _init = . ;

    LONG (0x4e560000)   /* linkw %fp,#0 */

    *(.init)

    SHORT (0x4e5e)      /* unlk %fp */

    SHORT (0x4e75)      /* rts */

    _fini = . ;

    LONG (0x4e560000)   /* linkw %fp,#0 */

    *(.fini)

    SHORT (0x4e5e)      /* unlk %fp */

    SHORT (0x4e75)      /* rts */

    . = ALIGN(0x800);   /* align to a 2K dcache boundary */

    _dcache_start = .;

    *(DCACHE_CODE)

    _dcache_end = .;

    _etext = .;

    *(.lit)

    . = ALIGN(0x4);

    __start_romdata = .;

  } > ${TEXT}

  /* Initialized data section.  */

  .data :

  {

    _data = .;

    *(.got.plt) *(.got)

    *(.shdata);

    *(.data .data.*)

    *(.gnu.linkonce.d.*)

    _edata_cksum = .;

    *(checksum);

    _edata = .;

  } > ${DATA} ${DATALOAD:+AT>} ${DATALOAD}

  /* Zero-initialized data.  */

  .bss :

  {

    . = ALIGN(0x4);

    __bss_start = . ;

    *(.shbss)

    *(.bss .bss.*)

    *(.gnu.linkonce.b.*)

    *(COMMON)

    _end =  ALIGN (0x8);

    __end = _end;

  } > ${DATA}

  /* Specially designated data is placed in the internal RAM.  */

  fast_memory :

  {

    . = ALIGN(0x4);

    __fast_start = .;

    *(FAST_RAM)

    __fast_stop = .;

  } > int_ram

}

PROVIDE (__stack = ${STACK});

PROVIDE (_heapend = ${HEAPEND});

EOF