TAG:
1、编译busybox
交叉编译器: 3.4.1,我使用的是1.4.1版的BUSYBOX。
# tar jxvf busybox-1.4.1.tar.bz2
修改源码、配置、编译 ----------------------------------------------- # cd busybox-1.4.1 修改 Makefile ARCH ?= arm
CROSS_COMPILE ?= /usr/local/arm/3.4.1/bin/arm-linux- # make menuconfig Busybox Settings ---> Build Options ---> [*] Build BusyBox as a static binary (no shared libs) //这样就省去了寻找共享库的麻烦 Installation Options --->
[*] Don't use /usr Linux System Utilities ---> [*] mdev //成功移植完2.6.19后,由于没有启动udev,造成/dev下没有 设备文件。也就是说所有的设备都没有挂接进来。最新的busybox已经包含了udev的简化版本即mdev,且使用非常简单。 要使用mdev还需要在root filesystem中做适当配置。 [*] Support /etc/mdev.conf [*] Support command execution at device addition/removal Shells ---> Choose your default shell (ash) ---> # make
# make install 这时会在你的编译目录下生成一个_install的目录,里面包含了生成的所有文件和目录结构。
为mdev的运行准备环境 ----------------------------------------------- mdev需要改写/dev和/sys两个目录。所以必须保证这两个目录是可写的(一般会用到sysfs,tmpfs。所以要重新编译内核)。然后在你的启动脚本文件中加入/sbin/mdev –s linux-2.6.19 -- make menuconfig
File systems ---> Pseudo filesystems ---> [*] sysfs file system support [*] Virtual memory file system support (former shm fs) [*] Tmpfs POSIX Access Control Lists 编译busybox时遇到的问题:
如果是静态编译的话
Busybox Settings --->
Build Options ---> [*] Build BusyBox as a static binary (no shared libs) # make
将会遇到下面问题: applets/applets.c:20:2: error: #warning Static linking against glibc produces buggy executables
applets/applets.c:21:2: error: #warning (glibc does not cope well with ld --gc-sections). applets/applets.c:22:2: error: #warning See sources.redhat.com/bugzilla/show_bug.cgi?id=3400 applets/applets.c:23:2: error: #warning Note that glibc is unsuitable for static linking anyway. applets/applets.c:24:2: error: #warning If you still want to do it, remove -Wl,--gc-sections applets/applets.c:25:2: error: #warning from top-level Makefile and remove this warning. make[1]: *** [applets/applets.o] Error 1 这个警告的定义在applets/applets.c中。将这段警告注释掉就可以了。这段警告的意思是告诉你最好用uclibc编译,而不是用glibc因为glibc比较大,在嵌入式系统中,对空间占用要求较高,所以会有这样的要求。
# vi /busybox-1.4.1/applets/applets.c +20
注释掉20 -- 28行内容即可 # vi applets/applets.c
/* #if ENABLE_STATIC && defined(__GLIBC__) && !defined(__UCLIBC__) #warning Static linking against glibc produces buggy executables #warning (glibc does not cope well with ld --gc-sections). #warning See sources.redhat.com/bugzilla/show_bug.cgi?id=3400 #warning Note that glibc is unsuitable for static linking anyway. #warning If you still want to do it, remove -Wl,--gc-sections #warning from top-level Makefile and remove this warning. #error Aborting compilation. #endif */ miscutils/taskset.c:17: error: parse error before '*' token
-----------------------------------------------
最根本的解决办法是换一个libc库,可是现在还不知道哪个库最合适,唯有暂时将有问题的命令关掉
Miscellaneous Utilities --->
[ ] taskset Runit Utilities --->
[ ] runsv 内核启动时遇到的问题:
“could not run '/bin/sh': No such file or directory” 解决方法: 要这样配置: Shells ---> Choose your default shell (ash) ---> 如果是这样配置的话,虽然可以生成ash,但不能生成sh,将会在内核启动时出现上面出现的问题: Shells ---> Choose your default shell (ash) ---> [*] ash 这样,编译完成之后,在busybox目录下会生成一个_install目录,里面有/bin和/sbin以及一个linuxrc文件!
(sokernel) |