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Diffstat (limited to 'libgloss/m68k/fido.sc')
| -rw-r--r-- | libgloss/m68k/fido.sc | 222 |
1 files changed, 222 insertions, 0 deletions
diff --git a/libgloss/m68k/fido.sc b/libgloss/m68k/fido.sc new file mode 100644 index 000000000..07aa6e366 --- /dev/null +++ b/libgloss/m68k/fido.sc @@ -0,0 +1,222 @@ +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 <<EOF +/* + * 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 .gnu.linkonce.t.*) + . = ALIGN(0x4); + __CTOR_LIST__ = .; + ___CTOR_LIST__ = .; + LONG((__CTOR_END__ - __CTOR_LIST__) / 4 - 2) + *(.ctors) + LONG(0) + __CTOR_END__ = .; + __DTOR_LIST__ = .; + ___DTOR_LIST__ = .; + LONG((__DTOR_END__ - __DTOR_LIST__) / 4 - 2) + *(.dtors) + LONG(0) + __DTOR_END__ = .; + *(.rodata* .gnu.linkonce.r.*) + *(.gcc_except_table) + *(.eh_frame) + + . = ALIGN(0x2); + __INIT_SECTION__ = . ; + LONG (0x4e560000) /* linkw %fp,#0 */ + *(.init) + SHORT (0x4e5e) /* unlk %fp */ + SHORT (0x4e75) /* rts */ + + __FINI_SECTION__ = . ; + 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 = .; + KEEP (*(.jcr)); + *(.shdata); + *(.data .gnu.linkonce.d.*); + _edata_cksum = .; + *(checksum); + _edata = .; + } > ${DATA} ${DATALOAD:+AT>} ${DATALOAD} + + /* Zero-initialized data. */ + .bss : + { + . = ALIGN(0x4); + __bss_start = . ; + *(.shbss) + *(.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 |