AM335x u-boot启动流程问题

桃扇骨 2022-08-13 08:29 93阅读 0赞

http://www.deyisupport.com/question\_answer/dsp\_arm/sitara\_arm/f/25/t/17341.aspx

#### AM335x u-boot启动流程问题 ####

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          <span>发表于&nbsp;</span> 
          <span><a href="http://www.deyisupport.com/question_answer/dsp_arm/sitara_arm/f/25/t/17341.aspx" style="outline:none; color:rgb(102,102,102); text-decoration:none" rel="nofollow">2013-1-9 23:33</a></span> 
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    秀才 130分
    
    starter kit u-boot启动第一 阶 段程序和第二阶 段程序入口都是start.s文件的\_start, 请问是根据 哪些宏定义决定编译哪些代码的 ?
    
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          <span><a href="http://www.deyisupport.com/question_answer/dsp_arm/sitara_arm/f/25/p/17341/58131.aspx#58131" style="outline:none; color:rgb(102,102,102); text-decoration:none" rel="nofollow">2013-1-10 13:05</a></span> 
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    榜眼 23257分
    
    SPL 的一个宏
    
    Have a try, no Hesitate!
    
    如果我的回答解决了您的问题，请确认答案，谢谢！：）
    
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          <span><a href="http://www.deyisupport.com/question_answer/dsp_arm/sitara_arm/f/25/p/17341/58264.aspx#58264" style="outline:none; color:rgb(102,102,102); text-decoration:none" rel="nofollow">2013-1-11 18:32</a></span> 
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    秀才 130分
    
    您的意思是CONFIG\_SPL\_BUILD这个宏定义吧？
    
    但是通过u-boot.map和u-boot-spl.map两个文件看，start.s执行到bl board\_init\_f这里没有ifdef或者ifndef CONFIG\_SPL\_BUILD，SPL调用的是omap-common文件夹spl.c的board\_init\_f() 函数，
    
    但是第二阶段编译调用的是lib文件夹board.c的board\_init\_f() 函数，那编译器是通过什么选择编译哪个函数的？
    
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          <span><a href="http://www.deyisupport.com/question_answer/dsp_arm/sitara_arm/f/25/p/17341/58267.aspx#58267" style="outline:none; color:rgb(102,102,102); text-decoration:none" rel="nofollow">2013-1-11 18:43</a></span> 
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    榜眼 23257分
    
    makefile
    
    Have a try, no Hesitate!
    
    如果我的回答解决了您的问题，请确认答案，谢谢！：）
    
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          <span><a href="http://www.deyisupport.com/question_answer/dsp_arm/sitara_arm/f/25/p/17341/58271.aspx#58271" style="outline:none; color:rgb(102,102,102); text-decoration:none" rel="nofollow">2013-1-11 22:30</a></span> 
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    秀才 130分
    
    不明白怎样通过makefile获取编译哪个函数？可否具体一点，以下是部分源代码
    
    reset:  
     bl save\_boot\_params  
     /\*  
      \* set the cpu to SVC32 mode  
      \*/  
     mrs r0, cpsr  
     bic r0, r0, \#0x1f  
     orr r0, r0, \#0xd3  
     msr cpsr,r0
    
    \#if defined(CONFIG\_OMAP34XX)  
     /\* Copy vectors to mask ROM indirect addr \*/  
     adr r0, \_start  @ r0 <- current position of code  
     add r0, r0, \#4  @ skip reset vector  
     mov r2, \#64   @ r2 <- size to copy  
     add r2, r0, r2  @ r2 <- source end address  
     mov r1, \#SRAM\_OFFSET0 @ build vect addr  
     mov r3, \#SRAM\_OFFSET1  
     add r1, r1, r3  
     mov r3, \#SRAM\_OFFSET2  
     add r1, r1, r3  
    next:  
     ldmia r0!, \{r3 - r10\}  @ copy from source address \[r0\]  
     stmia r1!, \{r3 - r10\}  @ copy to   target address \[r1\]  
     cmp r0, r2   @ until source end address \[r2\]  
     bne next   @ loop until equal \*/  
    \#if !defined(CONFIG\_SYS\_NAND\_BOOT) && !defined(CONFIG\_SYS\_ONENAND\_BOOT)  
     /\* No need to copy/exec the clock code - DPLL adjust already done  
      \* in NAND/oneNAND Boot.  
      \*/  
     bl cpy\_clk\_code  @ put dpll adjust code behind vectors  
    \#endif /\* NAND Boot \*/  
    \#endif  
     /\* the mask ROM code should have PLL and others stable \*/  
    \#ifndef CONFIG\_SKIP\_LOWLEVEL\_INIT  
     bl cpu\_init\_crit  
    \#endif
    
    /\* Set stackpointer in internal RAM to call board\_init\_f \*/  
    call\_board\_init\_f:  
     ldr sp, =(CONFIG\_SYS\_INIT\_SP\_ADDR)  
     bic sp, sp, \#7 /\* 8-byte alignment for ABI compliance \*/  
     ldr r0,=0x00000000  
     bl board\_init\_f
    
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          <span><a href="http://www.deyisupport.com/question_answer/dsp_arm/sitara_arm/f/25/p/17341/59748.aspx#59748" style="outline:none; color:rgb(102,102,102); text-decoration:none" rel="nofollow">2013-1-27 18:03</a></span> 
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    秀才 205分
    
    makefile像一个大的框架，它控制了整个项目，编译工具链的定义，编译(compile)流程，链接流程(link). 有一篇蛮好的文章你可以看看http://blog.csdn.net/haoel/article/details/2886. 你仔细检查uboot，最外层有一个文件叫Makefile,然后进入子目录你会发现里面有很多config.mk，这个也是makefile文件，最外层的Makefile就像一个树的根部，config.mk为枝枝叶叶，定义了具体的编译细节. 你贴的这个代码中，具体哪些代码被编译进去是通过\#define 这些宏定义来实现的，你可以在项目中搜索\#if defined 后紧跟的宏定义名称是不是在项目的哪个文件中定义了，如果定义了，从\#ifdef 到\#endif这段代码就会被编译进去，如果没有定义就不会编译进去。
    
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    秀才 130分
    
    这点我已经搞明白了，可以看u-boot-2011.09-psp04.06.00.08/arch/arm/cpu/armv7/omap-common的makefile：
    
    **ifdef CONFIG\_SPL\_BUILD**
    
    **COBJS  += spl.o**
    
    第二阶段没有define CONFIG\_SPL\_BUILD，所以不会生成**spl.o，**也就是不会编译**spl.c**，所以不会在spl.c文件中找**board\_init\_f**，而在u-boot-2011.09-psp04.06.00.08/arch/arm/lib的makefile中有
    
    **ifndef CONFIG\_SPL\_BUILD**
    
    **COBJS-y      += board.o**
    
    所以此时调用的是board.c的**board\_init\_f**，
    
    但现在有另外一个不明白的问题困扰着我，有没有define CONFIG\_SPL\_BUILD，应该取决于有没有执行spl文件夹下面的makefile，因为里面有
    
    CONFIG\_SPL\_BUILD := y  
    export CONFIG\_SPL\_BUILD
    
    按照这样的想法，我在makefile中加入这样语句：
    
    CONFIG\_XXX := y  
    export CONFIG\_XXX
    
    然后在c文件中写
    
    \#ifdef CONFIG\_XXX
    
    相关代码。。。。。。
    
    \#endif
    
    但是编译器就是不认为CONFIG\_XXX被define了，但是编译器为什么又认CONFIG\_SPL\_BUILD被define呢？真是搞不明白。
    
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          <span><a href="http://www.deyisupport.com/question_answer/dsp_arm/sitara_arm/f/25/p/17341/60448.aspx#60448" style="outline:none; color:rgb(102,102,102); text-decoration:none" rel="nofollow">2013-2-5 20:42</a></span> 
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    探花 9146分
    
    同时，不仅在makefile，在uboot 源文件内也会根据
    
    \#ifdef CONFIG\_SPL\_BUILD
    
    \#ifndef CONFIG\_SPL\_BUILD
    
    来选择哪些函数是否编译，具体可以查看代码
    
      
    
    
    如果答案回答了您的问题，请确认答案，谢谢！：）
    
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