フレンドリーアームARM-tiny 4412-ubootソースコード分析に基づく

/*
 * armboot - Startup Code for OMAP3530/ARM Cortex CPU-core
 *
 * Copyright (c) 2004	Texas Instruments 
 *
 * Copyright (c) 2001	Marius Gr?ger 
 * Copyright (c) 2002	Alex Züpke 
 * Copyright (c) 2002	Gary Jennejohn 
 * Copyright (c) 2003	Richard Woodruff 
 * Copyright (c) 2003	Kshitij 
 * Copyright (c) 2006-2008 Syed Mohammed Khasim 
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include 
#include 
#include 

#if defined(CONFIG_S5PC110) && defined(CONFIG_EVT1) && !defined(CONFIG_FUSED)   @        
	.word 0x2000
	.word 0x0
	.word 0x0
	.word 0x0
#endif

.globl _start
_start: b	reset        @    ，    b        ，       

	@           
	ldr	pc, _undefined_instruction
	ldr	pc, _software_interrupt
	ldr	pc, _prefetch_abort
	ldr	pc, _data_abort
	ldr	pc, _not_used
	ldr	pc, _irq
	ldr	pc, _fiq

_undefined_instruction: .word undefined_instruction   @        
_software_interrupt:	.word software_interrupt
_prefetch_abort:	.word prefetch_abort
_data_abort:		.word data_abort
_not_used:		.word not_used
_irq:			.word irq
_fiq:			.word fiq
_pad:			.word 0x12345678 /* now 16*4=64 */  @    16       
.global _end_vect
_end_vect:

	.balignl 16,0xdeadbeef   @     16       
/*************************************************************************
 *
 * Startup Code (reset vector)       ，    ，               ，          
 *
 * do important init only if we don't start from memory!
 * setup Memory and board specific bits prior to relocation.
 * relocate armboot to ram
 * setup stack
 *
 *************************************************************************/

.globl _TEXT_BASE
_TEXT_BASE:
	.word	CONFIG_SYS_TEXT_BASE   @       Makefile      ，   0xc3e00000

/*
 * These are defined in the board-specific linker script.
 */
.globl _bss_start_ofs
_bss_start_ofs:
	.word __bss_start - _start     //__bss_start        bss   ，_end bss   ,    bss ，           

.globl _bss_end_ofs
_bss_end_ofs:
	.word _end - _start

#ifdef CONFIG_USE_IRQ    
/* IRQ stack memory (calculated at run-time) */        
.globl IRQ_STACK_START
IRQ_STACK_START:        
	.word	0x0badc0de

/* IRQ stack memory (calculated at run-time) */
.globl FIQ_STACK_START
FIQ_STACK_START:
	.word 0x0badc0de
#endif

/* IRQ stack memory (calculated at run-time) + 8 bytes */
.globl IRQ_STACK_START_IN
IRQ_STACK_START_IN:
	.word	0x0badc0de

/*
 * the actual reset code         
 */

reset:
	/*
	 * set the cpu to SVC32 mode    CPU  SVC  
	 */
	mrs	r0, cpsr        CPSR  I 
	bic	r0, r0, #0x1f
	orr	r0, r0, #0xd3
	msr	cpsr,r0

#if (CONFIG_OMAP34XX)
	/* Copy vectors to mask ROM indirect addr */
	/ *      ROM    */
	adr	r0, _start		@ r0