scat_rom.scf

ucos系统中键盘及LED驱动实验.

;;; Copyright Up-tech 2003. All rights reserved.
;;; by threewter	
;;; [e-mail]
;;; 2004.5.1

;
; This scatterloading descriptor file defines: one load region (LOAD) 
; and 6 execution regions (ROM_EXEC, RAM_EXEC, RAM, HEAP, STACKS, EXCEPTION_EXEC).
;
; The program include two part. 

;	The first one is loader which is placed at ROM_EXEC.
;	the loader include __main.o, Region$$Table and ZISection$$Table.(reference 
;	What code/data must be placed in a root region of a scatter file? in www.arm.com)
;	Program execution starts at AREA Init in startup.s, which is placed '+First' in 
;	the image. 

;	The Other program (code & data) is placed in RAM_EXEC which locat in system ram base at 0x40200000,
;	of length 2Mbytes. 

; RAM might be fast on-chip (internal) RAM, and is typically
; used for the stack and code that must be executed quickly.

; The ZI data will get created (initialized) in RAM, above the RW data.
;
; The region HEAP is used to locate the bottom of the heap immediately above 
; the ZI data ("+0"). The heap will grow up from this address.
;
; The region STACKS is used to locate the top of the memory used to store
; the stacks for each mode. The stacks will grow down from this address.
;
; The region EXCEPTION_EXEC is used to place the position of the exception table.
; It must use OVERLAY key word for place it outside of RAM_EXEC without any error.
; The exception table is copy into 0x40000000 by bootloader.
;
; Regions marked UNINIT will be left uninitialized, i.e. they will not be 
; zero-initialized by the C library when it starts-up.


LOAD 0x0
{
	ROM_EXEC +0
	{
		startup.o (init, +FIRST)
		__main.o (+RO)		  ; copy code
		* (Region$$Table)     ; RO/RW addresses to copy
		* (ZISection$$Table)  ; ZI addresses to zero
	}

	RAM_EXEC 0x40200000
	{
		* (+RO)
    }

    STACKS 0x40400000 UNINIT	;2MByte for RAM_EXEC
    {
        stack.o (+ZI)
    }

    RAM +0
    {
        * (+RW,+ZI)
    }

    HEAP +0 UNINIT
    {
        heap.o (+ZI)
    }

    EXCEPTION_EXEC 0x40000008	OVERLAY
    {
    	exception.o	(+RO)
    }
}