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LPC81X: reduce code size and add ARM_GCC support
LPC810 has only 4KB of flash, thus avoiding dead code is really nice. Here the NVIC interrupt setup was pulled from the us_ticker code even if no code is using timer events. This also adds ARM_GCC support for TARGET_LPC81X. LPC81X and LPC82X support Cortex M0+ VTOR register, so it is not necessary to put non-init text at 0x200.
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‎.gitignore

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# vim swap files
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*.swp
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*~
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‎libraries/mbed/targets/cmsis/TARGET_NXP/TARGET_LPC81X/TARGET_LPC810/TOOLCHAIN_GCC_ARM/LPC810.ld

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/* Linker script for mbed LPC810-GCC-ARM based on LPC824.ld */
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/* Linker script to configure memory regions. */
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MEMORY
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{
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/* Define each memory region */
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FLASH (rx) : ORIGIN = 0x0, LENGTH = 0x1000 /* 4K bytes */
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RAM (rwx) : ORIGIN = 0x10000000+0xC0, LENGTH = 0x400-0xC0 /* 1K bytes */
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}
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/* Linker script to place sections and symbol values. Should be used together
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* with other linker script that defines memory regions FLASH and RAM.
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* It references following symbols, which must be defined in code:
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* Reset_Handler : Entry of reset handler
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*
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* It defines following symbols, which code can use without definition:
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* __exidx_start
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* __exidx_end
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* __etext
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* __data_start__
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* __preinit_array_start
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* __preinit_array_end
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* __init_array_start
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* __init_array_end
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* __fini_array_start
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* __fini_array_end
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* __data_end__
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* __bss_start__
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* __bss_end__
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* __end__
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* end
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* __HeapLimit
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* __StackLimit
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* __StackTop
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* __stack
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*/
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ENTRY(Reset_Handler)
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SECTIONS
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{
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.text :
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{
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KEEP(*(.isr_vector))
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*(.text.Reset_Handler)
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*(.text.SystemInit)
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*(.text*)
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KEEP(*(.init))
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KEEP(*(.fini))
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/* .ctors */
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*crtbegin.o(.ctors)
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*crtbegin?.o(.ctors)
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*(EXCLUDE_FILE(*crtend?.o *crtend.o) .ctors)
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*(SORT(.ctors.*))
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*(.ctors)
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/* .dtors */
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*crtbegin.o(.dtors)
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*crtbegin?.o(.dtors)
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*(EXCLUDE_FILE(*crtend?.o *crtend.o) .dtors)
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*(SORT(.dtors.*))
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*(.dtors)
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*(.rodata*)
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KEEP(*(.eh_frame*))
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} > FLASH
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.ARM.extab :
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{
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*(.ARM.extab* .gnu.linkonce.armextab.*)
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} > FLASH
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__exidx_start = .;
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.ARM.exidx :
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{
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*(.ARM.exidx* .gnu.linkonce.armexidx.*)
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} > FLASH
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__exidx_end = .;
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__etext = .;
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.data : AT (__etext)
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{
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__data_start__ = .;
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*(vtable)
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*(.data*)
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. = ALIGN(4);
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/* preinit data */
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PROVIDE (__preinit_array_start = .);
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KEEP(*(.preinit_array))
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PROVIDE (__preinit_array_end = .);
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. = ALIGN(4);
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/* init data */
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PROVIDE (__init_array_start = .);
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KEEP(*(SORT(.init_array.*)))
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KEEP(*(.init_array))
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PROVIDE (__init_array_end = .);
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. = ALIGN(4);
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/* finit data */
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PROVIDE (__fini_array_start = .);
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KEEP(*(SORT(.fini_array.*)))
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KEEP(*(.fini_array))
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PROVIDE (__fini_array_end = .);
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. = ALIGN(4);
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/* All data end */
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__data_end__ = .;
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} > RAM
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.bss :
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{
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__bss_start__ = .;
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*(.bss*)
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*(COMMON)
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__bss_end__ = .;
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} > RAM
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.heap :
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{
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__end__ = .;
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end = __end__;
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*(.heap*)
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__HeapLimit = .;
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} > RAM
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/* .stack_dummy section doesn't contains any symbols. It is only
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* used for linker to calculate size of stack sections, and assign
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* values to stack symbols later */
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.stack_dummy :
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{
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*(.stack)
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} > RAM
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/* Set stack top to end of RAM, and stack limit move down by
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* size of stack_dummy section */
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__StackTop = ORIGIN(RAM) + LENGTH(RAM);
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__StackLimit = __StackTop - SIZEOF(.stack_dummy);
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PROVIDE(__stack = __StackTop);
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/* Check if data + heap + stack exceeds RAM limit */
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ASSERT(__StackLimit >= __HeapLimit, "region RAM overflowed with stack")
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}

‎libraries/mbed/targets/cmsis/TARGET_NXP/TARGET_LPC81X/TARGET_LPC812/TOOLCHAIN_GCC_ARM/LPC812.ld

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/* Linker script for mbed LPC812-GCC-ARM based on LPC824.ld */
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/* Linker script to configure memory regions. */
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MEMORY
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{
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/* Define each memory region */
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FLASH (rx) : ORIGIN = 0x0, LENGTH = 0x4000 /* 16K bytes */
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RAM (rwx) : ORIGIN = 0x10000000+0xC0, LENGTH = 0x1000-0xC0 /* 4K bytes */
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}
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/* Linker script to place sections and symbol values. Should be used together
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* with other linker script that defines memory regions FLASH and RAM.
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* It references following symbols, which must be defined in code:
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* Reset_Handler : Entry of reset handler
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*
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* It defines following symbols, which code can use without definition:
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* __exidx_start
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* __exidx_end
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* __etext
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* __data_start__
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* __preinit_array_start
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* __preinit_array_end
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* __init_array_start
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* __init_array_end
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* __fini_array_start
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* __fini_array_end
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* __data_end__
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* __bss_start__
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* __bss_end__
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* __end__
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* end
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* __HeapLimit
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* __StackLimit
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* __StackTop
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* __stack
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*/
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ENTRY(Reset_Handler)
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SECTIONS
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{
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.text :
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{
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KEEP(*(.isr_vector))
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*(.text.Reset_Handler)
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*(.text.SystemInit)
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*(.text*)
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KEEP(*(.init))
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KEEP(*(.fini))
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/* .ctors */
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*crtbegin.o(.ctors)
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*crtbegin?.o(.ctors)
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*(EXCLUDE_FILE(*crtend?.o *crtend.o) .ctors)
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*(SORT(.ctors.*))
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*(.ctors)
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/* .dtors */
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*crtbegin.o(.dtors)
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*crtbegin?.o(.dtors)
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*(EXCLUDE_FILE(*crtend?.o *crtend.o) .dtors)
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*(SORT(.dtors.*))
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*(.dtors)
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*(.rodata*)
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KEEP(*(.eh_frame*))
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} > FLASH
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.ARM.extab :
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{
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*(.ARM.extab* .gnu.linkonce.armextab.*)
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} > FLASH
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__exidx_start = .;
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.ARM.exidx :
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{
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*(.ARM.exidx* .gnu.linkonce.armexidx.*)
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} > FLASH
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__exidx_end = .;
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__etext = .;
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.data : AT (__etext)
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{
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__data_start__ = .;
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*(vtable)
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*(.data*)
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. = ALIGN(4);
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/* preinit data */
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PROVIDE (__preinit_array_start = .);
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KEEP(*(.preinit_array))
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PROVIDE (__preinit_array_end = .);
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. = ALIGN(4);
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/* init data */
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PROVIDE (__init_array_start = .);
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KEEP(*(SORT(.init_array.*)))
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KEEP(*(.init_array))
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PROVIDE (__init_array_end = .);
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. = ALIGN(4);
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/* finit data */
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PROVIDE (__fini_array_start = .);
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KEEP(*(SORT(.fini_array.*)))
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KEEP(*(.fini_array))
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PROVIDE (__fini_array_end = .);
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. = ALIGN(4);
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/* All data end */
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__data_end__ = .;
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} > RAM
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.bss :
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{
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__bss_start__ = .;
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*(.bss*)
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*(COMMON)
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__bss_end__ = .;
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} > RAM
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.heap :
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{
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__end__ = .;
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end = __end__;
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*(.heap*)
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__HeapLimit = .;
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} > RAM
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/* .stack_dummy section doesn't contains any symbols. It is only
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* used for linker to calculate size of stack sections, and assign
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* values to stack symbols later */
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.stack_dummy :
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{
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*(.stack)
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} > RAM
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/* Set stack top to end of RAM, and stack limit move down by
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* size of stack_dummy section */
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__StackTop = ORIGIN(RAM) + LENGTH(RAM);
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__StackLimit = __StackTop - SIZEOF(.stack_dummy);
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PROVIDE(__stack = __StackTop);
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/* Check if data + heap + stack exceeds RAM limit */
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ASSERT(__StackLimit >= __HeapLimit, "region RAM overflowed with stack")
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}

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