MPC8349E-mITXE的U-Boot汇编startS分析笔记.doc

MPC8349E-mITXE的U-Boot汇编start.S分析笔记(转） 1 /*　　 2 * // MPC8349E-mITX ltib U-Boot cpu/mpc83xx/start.S --- by starby　　 3 *　　 4 * Copyright (C) 1998 Dan Malek 　　 5 * Copyright (C) 1999 Magnus Damm 　　 6 * Copyright (C) 2000, 2001,2002 Wolfgang Denk 　　 7 * Copyright (C) Freescale Semiconductor, Inc. 2004, 2006. All rights reserved.　　 8 *　　 9 * See file CREDITS for list of people who contributed to this　　 10 * project.　　 11 *　　 12 * This program is free software; you can redistribute it and/or　　 13 * modify it under the terms of the GNU General Public License as　　 14 * published by the Free Software Foundation; either version 2 of　　 15 * the License, or (at your option) any later version.　　 16 *　　 17 * This program is distributed in the hope that it will be useful,　　 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of　　 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the　　 20 * GNU General Public License for more details.　　 21 *　　 22 * You should have received a copy of the GNU General Public License　　 23 * along with this program; if not, write to the Free Software　　 24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,　　 25 * MA 02111-1307 USA　　 26 */　　 27 // 采用大端模式的32位处理器(如基于e300核的MPC8349)，将其寄存器的最高位(msb)定义为0，最低位(lsb)为31;　　 28 // 而采用小端模式的32位处理器，将其寄存器的最高位定义位31，低位地址定义为0.　　 29 　　 30 /*　　 31 * U-Boot - Startup Code for MPC83xx PowerPC based Embedded Boards　　 32 */　　 33 　　 34 #include 　　 35 #include 　　 36 #include 　　 37 　　 38 #define CONFIG_83XX 1 /* needed for Linux kernel header files*/　　 39 #define _LINUX_CONFIG_H 1 /* avoid reading Linux autoconf.h file */　　 40 　　 41 #include // 此文件定义寄存器相关，异常相关函数等　　 42 #include 　　 43 　　 44 #include 　　 45 #include 　　 46 　　 47 #ifndef CONFIG_IDENT_STRING　　 48 #define CONFIG_IDENT_STRING MPC83XX　　 49 #endif　　 50 　　 51 /* We dont want the MMU yet.　　 52 */　　 53 #undef MSR_KERNEL　　 54 　　 55 /*　　 56 * Floating Point enable, Machine Check and Recoverable Inter