目录
目录
文件修订记录 ...............................................................................................................................1
目录 ...............................................................................................................................................2
摘要 ...............................................................................................................................................4
1 ARM 上电取第一条指令流程 .................................................................................................5
1.1 上电后的第一条指令在哪里？ ...........................................................................................5
1.1.1 norflash 和 nandflash 的异同 .............................................................................................5
2 Uboot.lds 链接脚本分析 ..........................................................................................................7
2.1 为什么要分析 uboot 链接脚本？ ........................................................................................7
2.2 连接代码具体分析 ...............................................................................................................7
3 Uboot 中 start.S 文件分析 .......................................................................................................9
3.1 start.S 详解 .............................................................................................................................9
3.1.1 _start ....................................................................................................................................9
3.1.2 reset .....................................................................................................................................9
3.1.3 cpu_init_cp15 .................................................................................................................... 11
3.1.4 cpu_init_crit ......................................................................................................................12
3.1.5 lowlevel_init ......................................................................................................................13
3.1.6 s_init ..................................................................................................................................14
3.1.7 call_board_init_f ...............................................................................................................15
3.1.8 board_init_f .......................................................................................................................15
3.1.9 relocate_code .....................................................................................................................16
3.1.10 clear_bss ..........................................................................................................................17
3.1.11 jump_2_ram .....................................................................................................................17
3.2 本章小结 .............................................................................................................................18
4 板级初始化及跳入 Linux 内核执行 ....................................................................................19
4.1 board_init_r...........................................................................................................................19
4.1.1 三级标题 ............................................................................................ 错误!未定义书签。
4.2 本章小结 ............................................................................................... 错误!未定义书签。
5 Uboot 异常处理 ......................................................................................................................20
5.1 Uboot 异常向量表 ...............................................................................................................20
5.1.1 异常处理入口函数 ..........................................................................................................20
5.1.2 异常处理函数跳转 ..........................................................................................................21
5.1.3 异常真正处理函数 ..........................................................................................................22
5.2 本章总结 .............................................................................................................................24
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