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<DIV class=tableborder style="BACKGROUND-COLOR: #ffffff">
<DIV class="subtable bold altbg1"><A 
href="http://linux.chinaunix.net/bbs/archiver/">Linux论坛</A> <B>&raquo;</B> <A 
href="http://linux.chinaunix.net/bbs/archiver/fid-42.html">嵌入式系统</A> <B>&raquo;</B> 
[已解决]嵌入式板子控制台丢失!</DIV><BR><BR>
<DIV class="simpletable smalltxt" style="WIDTH: 98%">
<DIV class="subtable altbg1"><SPAN class=right>2007-6-13 16:02</SPAN> 
<B>smalloc</B></DIV>
<DIV class="subtable altbg2 t_msg" 
style="WIDTH: auto; HEIGHT: auto"><B>[已解决]嵌入式板子控制台丢失!</B><BR><BR>板子有个串口,做控制台,大家都知道<BR>我弄的系统在内核启动后开始运行到init进程了.<BR>运行到最后一段&nbsp;&nbsp;:<BR>&nbsp; 
&nbsp;&nbsp;&nbsp;[table=95%][tr][td]free_initmem();<BR>&nbsp; &nbsp;&nbsp; 
&nbsp;&nbsp;&nbsp;unlock_kernel();<BR>&nbsp; &nbsp;&nbsp; 
&nbsp;&nbsp;&nbsp;system_state = SYSTEM_RUNNING;<BR>&nbsp; &nbsp;&nbsp; 
&nbsp;&nbsp;&nbsp;numa_default_policy();<BR><BR>&nbsp; &nbsp;&nbsp; 
&nbsp;&nbsp;&nbsp;if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) 
&amp;lt; 0)<BR>&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; 
printk(KERN_ERR "Warning: unable to open an initial console.\n");<BR>&nbsp; 
&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;(void) sys_dup(0);<BR>&nbsp; &nbsp;&nbsp; 
&nbsp;&nbsp;&nbsp;(void) sys_dup(0);<BR>&nbsp; &nbsp;&nbsp; 
&nbsp;&nbsp;&nbsp;/*<BR>&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;* We try each of 
these until one succeeds.<BR>&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;*<BR>&nbsp; 
&nbsp;&nbsp; &nbsp;&nbsp; &nbsp;* The Bourne shell can be used instead of init 
if we are <BR>&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;* trying to recover a 
really broken machine.<BR>&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; 
&nbsp;*/<BR>printk(KERN_ERR"execute command\n");<BR>&nbsp; &nbsp;&nbsp; 
&nbsp;&nbsp;&nbsp;if (execute_command)<BR>&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; 
&nbsp;&nbsp; &nbsp;&nbsp; &nbsp; run_init_process(execute_command);<BR>//if 
(sys_open((const char __user 
*)"/sbin/init",O_RDWR,0)&amp;lt;0){printk(KERN_ERR"connot open 
/sbin/init\n");}else {printk(KERN_E<BR>RR"/sbin/init 
opened\n");}<BR>printk(KERN_ERR"run_init_process ok\n");<BR>&nbsp; &nbsp;&nbsp; 
&nbsp;&nbsp;&nbsp;run_init_process("/sbin/init");<BR>printk(KERN_ERR"sbin,init\n");<BR>&nbsp; 
&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;run_init_process("/etc/init");<BR>&nbsp; 
&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;run_init_process("/bin/init");<BR>&nbsp; 
&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;run_init_process("/bin/sh");<BR><BR>&nbsp; 
&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;panic("No init found.&nbsp;&nbsp;Try passing 
init= option to 
kernel.");<BR>}[/td][/tr][/table]<BR><BR>run_init_process("/sbin/init");能启动/sbin/init指向buzybox也运行了,但是这个时候控制台丢失了,但是可以printk出来信息,就是不能输入了<BR>&nbsp; 
&nbsp;&nbsp;&nbsp;(void) sys_dup(0);<BR>&nbsp; &nbsp;&nbsp; 
&nbsp;&nbsp;&nbsp;(void) 
sys_dup(0);<BR>这2个dup应该是复制文件描述符难道只有标准出错可请指教以用了,标准输入标准输出没了?<BR><BR>[[i] 本帖最后由 
smalloc 于 2007-6-18 11:05 编辑 [/i]]</DIV></DIV><BR>
<DIV class="simpletable smalltxt" style="WIDTH: 98%">
<DIV class="subtable altbg1"><SPAN class=right>2007-6-14 12:14</SPAN> 
<B>smalloc</B></DIV>
<DIV class="subtable altbg2 t_msg" style="WIDTH: auto; HEIGHT: auto">初步断定是<A 
name=baidusnap0></A><B 
style="COLOR: black; BACKGROUND-COLOR: #ffff66">busybox</B>的问题,请问大家有没有在busyboy配置不对的情况下出现过这情况?</DIV></DIV><BR>
<DIV class="simpletable smalltxt" style="WIDTH: 98%">
<DIV class="subtable altbg1"><SPAN class=right>2007-6-14 13:56</SPAN> 
<B>kf701</B></DIV>
<DIV class="subtable altbg2 t_msg" style="WIDTH: auto; HEIGHT: auto">直接 
init=/bin/sh 就可以。</DIV></DIV><BR>
<DIV class="simpletable smalltxt" style="WIDTH: 98%">
<DIV class="subtable altbg1"><SPAN class=right>2007-6-14 14:22</SPAN> 
<B>smalloc</B></DIV>
<DIV class="subtable altbg2 t_msg" style="WIDTH: auto; HEIGHT: auto">[quote]原帖由 
[i]kf701[/i] 于 2007-6-14 13:56 发表于 3楼&nbsp;&nbsp;<BR>直接 init=/bin/sh 就可以。 
[/quote]<BR>谢谢回复,你的意思是直接/bin/sh,当0进程,但是还有个问题,就是在嵌入板子上这些命令其实都是指向<B 
style="COLOR: black; BACKGROUND-COLOR: #ffff66">busybox</B>的连接,即使<A 
name=baidusnap1></A><B 
style="COLOR: black; BACKGROUND-COLOR: #a0ffff">执行</B>/bin/sh也还是运行<B 
style="COLOR: black; BACKGROUND-COLOR: #ffff66">busybox</B>,不同的是当init运行的时候会以inittab为参数文件运行里面的初始化<A 
name=baidusnap2></A><B 
style="COLOR: black; BACKGROUND-COLOR: #99ff99">脚本</B>和getty.</DIV></DIV><BR>
<DIV class="simpletable smalltxt" style="WIDTH: 98%">
<DIV class="subtable altbg1"><SPAN class=right>2007-6-14 16:10</SPAN> 
<B>augustusqing</B></DIV>
<DIV class="subtable altbg2 t_msg" 
style="WIDTH: auto; HEIGHT: auto">建议你找个能确定肯定没问题的<B 
style="COLOR: black; BACKGROUND-COLOR: #ffff66">busybox</B>盘验证一下<BR><BR>还有,请把你的启动信息给出来,给个内核函数啥用,大家都知道这个函数<BR>你可以在<B 
style="COLOR: black; BACKGROUND-COLOR: #ffff66">busybox</B>的init_main()函数开始使用一下printf()函数,你能用printk()说明不了你的问题,你的问题中printk()早就能用了,看能不能在用户空间使用printf()函数</DIV></DIV><BR>
<DIV class="simpletable smalltxt" style="WIDTH: 98%">
<DIV class="subtable altbg1"><SPAN class=right>2007-6-14 16:44</SPAN> 
<B>smalloc</B></DIV>
<DIV class="subtable altbg2 t_msg" style="WIDTH: auto; HEIGHT: auto">[quote]原帖由 
[i]augustusqing[/i] 于 2007-6-14 16:10 发表于 5楼&nbsp;&nbsp;<BR>建议你找个能确定肯定没问题的<B 
style="COLOR: black; BACKGROUND-COLOR: #ffff66">busybox</B>盘验证一下<BR><BR>还有,请把你的启动信息给出来,给个内核函数啥用,大家都知道这个函数<BR>你可以在<B 
style="COLOR: black; BACKGROUND-COLOR: #ffff66">busybox</B>的init_main()函数开始使用一下printf()函数,你能用printk()说明不 
... [/quote]<BR><BR>嵌入式系统(开发板)的<B 
style="COLOR: black; BACKGROUND-COLOR: #ffff66">busybox</B>盘?不明白.我这边的<B 
style="COLOR: black; BACKGROUND-COLOR: #ffff66">busybox</B>是编译好就在文件系统里面然后写在flash上,然后内核启动mount 
的,<B 
style="COLOR: black; BACKGROUND-COLOR: #ffff66">busybox</B>作为init进程肯定是运行了.不知道init_main能不能显示printf的内容,应该是不行吧.<BR><BR><B 
style="COLOR: black; BACKGROUND-COLOR: #ffff66">busybox</B>初始话<B 
style="COLOR: black; BACKGROUND-COLOR: #99ff99">脚本</B>设为/etc/inittab<BR>其内容是<BR>::sysinit:/etc/rc.d/rcS<BR>::respawn:/sbin/getty 
ttyS1 115200&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; # 
这行试过ttyS0和ttyS1都不行,而且这2设备是可以被打开的.<BR>::shutdown:/bin/umount 
-a<BR><BR><BR><BR><BR><BR>/etc/rc.d/rcS的内容是动态加载一些模块和设置设备参数<BR>头一部分是<BR>#!/bin/sh<BR><BR># 
This script runs when init it run during the boot process.<BR># Mounts 
everything in the fstab<BR>echo "rdS start"<BR>mount -a<BR><BR>#turn on user 

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