TQ210 —— s5pv210u-boot.lds分析

/*
* (C) Copyright 2002
* Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
*
* 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
*/
// u-boot.lds决定了u-boot可执行映像的连接方式，以及各个段的装载地址（装载域）和执行地址（运行域）。
// 这个文件指定了各个文件链接后的先后排序。
OUTPUT_FORMAT("elf32-littlearm", "elf32-littlearm", "elf32-littlearm")
/*OUTPUT_FORMAT("elf32-arm", "elf32-arm", "elf32-arm")*/
OUTPUT_ARCH(arm)
ENTRY(_start)
SECTIONS
{
/*
指定可执行image文件的全局入口点，通常这个地址都放在ROM(flash)0x0位置。
必须使编译器知道这个地址，通常都是修改此处来完成
*/
. = 0x00000000; /* .表示当前，当前地址是0，但这不是_start地址，会被TETX_BASE替代 */
/*
代码段基地址，board\samsung\TQ210\config.mk中定义，TEXT_BASE=0x23e00000
无论这里是什么都会被TEXT_BASE替代，所以这里的这个地址是不起作用的
*/
. = ALIGN(4); /* 4字节对齐 */
.text      :  @ 指定代码段
{   @ 执行顺序，start.S先运行
cpu/s5pv210/start.o			(.text)
cpu/s5pv210/s5pv210/cpu_init.o		(.text)
board/samsung/TQ210/lowlevel_init.o	(.text)
/*		cpu/s5pc11x/onenand_cp.o		(.text)		*/
cpu/s5pv210/nand_cp.o			(.text)
cpu/s5pv210/movi.o			(.text)
/*common/secure_boot.o			(.text)*/
common/ace_sha1.o			(.text)
cpu/s5pv210/pmic.o			(.text)
*					(.text)  @ 其它代码部分
}

. = ALIGN(4);
.rodata : { *(.rodata) }  @ 指定只读数据段

. = ALIGN(4);
.data : { *(.data) }   @ 指定读写数据段

. = ALIGN(4);
.got : { *(.got) }   @ 指定got段,got段式是uboot自定义的一个段,非标准段

__u_boot_cmd_start = .;   @ u_boot命令段起始
.u_boot_cmd : { *(.u_boot_cmd) }
__u_boot_cmd_end = .;     @ u_boot命令段结束

. = ALIGN(4);
.mmudata : { *(.mmudata) } @ mmu数据

. = ALIGN(4);
__bss_start = .; @ bss段起始
.bss : { *(.bss) }
_end = .;        @ bss段结束
}