project.lcf

牛人张明峰写的bootloader。很有参考价值。和很多freescale的例子不太一样

# Sample Linker Command File for CodeWarrior for ColdFire MCF51QE128

# Memory ranges	

MEMORY {
   userram     (RWX) : ORIGIN = 0x00800000, LENGTH = 0x00002000
   BootLoad    (RX)  : ORIGIN = 0x00000410, LENGTH = 0x000007F0
   VectorReMap (RX)  : ORIGIN = 0x00000C00, LENGTH = 0x00000400
   code        (RX)  : ORIGIN = 0x00001000, LENGTH = 0x0001F000
}      

#   VectorReMap (RX)  : ORIGIN = 0x00000C00, LENGTH = 0x000003F0
#   CheckSumTag (RX)  : ORIGIN = 0x00000FF0, LENGTH = 0x00000010

KEEP_SECTION {.text_bootload, .text_vectormap}

SECTIONS {

# Heap and Stack sizes definition
	___heap_size	  = 0x400;
	___stack_size    = 0x400;

# MCF51QE128 Derivative Memory map definitions from linker command files:
# ___RAM_ADDRESS, ___RAM_SIZE, ___FLASH_ADDRESS, ___FLASH_SIZE linker
# symbols must be defined in the linker command file.

# 8 Kbytes Internal SRAM
   ___RAM_ADDRESS = 0x00800000;
   ___RAM_SIZE    = 0x00002000;

# 128 KByte Internal Flash Memory
   ___FLASH_ADDRESS  = 0x00000000;
   ___FLASH_SIZE     = 0x00020000;

  .userram	   : {} > userram		
  .code	      : {} > code		
  .BootLoad    : {} > BootLoad
  .VectorReMap : {} > VectorReMap
  
#  Code placement for bootloader section
	.text_bootload :
	{
		* (.text_bootload)
		. = ALIGN (0x4);
	} >> BootLoad

#  Code placement for remapped vector section
	.text_vectormap :
	{
		VectorMap.c (.text_vectormap)
		. = ALIGN (0x4);
	} >> VectorReMap

	.text :
	{
		*(.text)
		. = ALIGN (0x4);
		*(.rodata)
		. = ALIGN (0x4);		
		___ROM_AT = .;
		___DATA_ROM = .;
	} >> code


	.data : AT(___ROM_AT) 
	{  
		___DATA_RAM = .;
		. = ALIGN(0x4);
		*(.exception)	
		. = ALIGN(0x4);	
		__exception_table_start__ = .;
		EXCEPTION
		__exception_table_end__ = .;
		
		___sinit__ = .;
	    STATICINIT
		__START_DATA = .;

		*(.data)
		. = ALIGN (0x4);
		__END_DATA = .;

		__START_SDATA = .;
		*(.sdata)
		. = ALIGN (0x4);
		__END_SDATA = .;

		___DATA_END = .;
		__SDA_BASE = .;
		. = ALIGN (0x4);
	} >> userram

	.bss :
	{
		___BSS_START = .;
		__START_SBSS = .;
		*(.sbss)
		. = ALIGN (0x4);
		*(SCOMMON)
		__END_SBSS = .;

		__START_BSS = .;
		*(.bss)
		. = ALIGN (0x4);
		*(COMMON)
		__END_BSS = .;
		___BSS_END = .;

		. = ALIGN(0x4);
	} >> userram

	.custom :
	{
		___HEAP_START	= .;
		___heap_addr	= ___HEAP_START;
		___HEAP_END		= ___HEAP_START + ___heap_size;
		___SP_END		= ___HEAP_END;
		___SP_INIT		= ___SP_END + ___stack_size;
	
		. = ALIGN (0x4);
	} >> userram
  	
	__SP_INIT		   = ___SP_INIT;
	
   ___SP_AFTER_RESET	= __SP_INIT;	

	_romp_at = ___ROM_AT + SIZEOF(.data);
	.romp : AT(_romp_at)
	{
		__S_romp = _romp_at;
		WRITEW(___ROM_AT);
		WRITEW(ADDR(.data));
		WRITEW(SIZEOF(.data));
		WRITEW(0);
		WRITEW(0);
		WRITEW(0);
	}

}