ipl_startup.s

i.mx31 3DS平台Nandboot引导程序源码

/*
 * Copyright 2004-2006 Freescale Semiconductor, Inc. All Rights Reserved.
 *
 * 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
 */

/*!
 * @file ipl_startup.S
 * 
 * @brief ARM processor startup code.\n 
 *
 * This code initializes the SDRAM and stack for Initial Program Loader.
 * This is written in ARM assembly as at this time C code execution
 * environment is not yet setup. Refer to MXC L3 documentation for SDRAM
 * controller details.
 * 
 * @ingroup NANDboot
 */
 
/*!
 * Stack start address for C environment
 */
#ifdef MX21
#define STACK_ADDR      0xC0008000
#else
#define STACK_ADDR      0x80004000
#endif

#ifdef  MXC91331
#include "mxc_setup_mxc91331.h"
#endif

#ifdef MXC91231
#include "mxc_setup_mxc91231.h"
#endif

#ifdef MX31
#include "mxc_setup_mx31.h"
#endif

#ifdef MXC91131
#include "mxc_setup_mxc91131.h"
#endif

#ifdef MX21
#include "mxc_setup_mx21.h"
#endif

/* 
 * PLATFORM_SETUP1 is platform specific setup macro, defined in the included
 * setup platform header files 
 */
startup:
        PLATFORM_SETUP1

        /* Initialization of stack pointer */    
        ldr	sp, =STACK_ADDR

        /* Copy main routine of IPL to memory and jump to it */
        bl	copy_jump_main

        /* We were running from NAND RAM buffer, we can't come back here */