/* * armboot - Startup Code for ARM920 CPU-core * * Copyright (c) 2001 Marius Gr鰃er <[email protected]> * Copyright (c) 2002 Alex Z黳ke <[email protected]> * Copyright (c) 2002 Gary Jennejohn <[email protected]> * * 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 <config.h> #include <version.h> /* ************************************************************************* * * Jump vector table as in table 3.1 in [1] * ************************************************************************* */ .globl_start
globl是个关键字，对应含义为： http://re-eject.gbadev.org/files/GasARMRef.pdf表 1.1. global的语法
所以，意思很简单，就是相当于C语言中的Extern，声明此变量，并且告诉链接器此变量是全局的，外部可以访问 所以，你可以看到
中，有用到此变量: ENTRY(_start) 即指定入口为_start,而由下面的_start的含义可以得知，_start就是整个start.S的最开始，即整个uboot的代码的开始。 |
 |  |  |
| 1.1. 设置CPU模式 |  | 1.1.2. _start |
