linux下led小灯的驱动.doc

我第一个字符设备驱动程序的痛苦经历 2009-12-26 21:07 写驱动程序是个痛苦成长的过程。。。 对驱动的编译，先要有支持的内核源码树，所以先得编译内核。由于过了两天才来整理，写的东西有点杂乱了。 1.按照那个入门设备驱动程序，来编译的时候老是错误，网络上有个参考的（/sabalol/archive/2008/02/01/2076610.aspx），但是他有一个严重的错误：编译linux源码的路径不对。 他的错误如下： [liu@liu-desktop hellomod]#make oldconfig[liu@liu-desktop hellomod]#make prepare应该是： [root@liu-desktop linux26]#make oldconfig[root@liu-desktop linux26]#make prepare 2.我下了linux内核后，直接make出现如下错误： [root@localhost my_drivers]# makemake -C /home/xinghun/linux- M=/home/xinghun/my_drivers modulesmake[1]: Entering directory `/home/xinghun/linux-ERROR: Kernel configuration is invalid.???????? include/linux/autoconf.h or include/config/auto.conf are missing.???????? Run make oldconfig make prepare on kernel src to fix it.make[1]: *** [include/config/auto.conf] Error 1make[1]: Leaving directory `/home/xinghun/linux-make: *** [default] Error 2 解决办法：红色部分（在linux内核目录下执行红色部分代码） [root@localhost linux-]# make preparescripts/kconfig/conf -s arch/arm/KconfigCHK???? include/linux/version.hUPD???? include/linux/version.hGenerating include/asm-arm/mach-types.hCHK???? include/linux/utsrelease.hUPD???? include/linux/utsrelease.hSYMLINK include/asm - include/asm-armCC????? kernel/bounds.sGEN???? include/linux/bounds.hCC????? arch/arm/kernel/asm-offsets.sGEN???? include/asm/asm-offsets.hCALL??? scripts/checksyscalls.shstdin:1097:2: warning: #warning syscall fadvise64 not implementedstdin:1265:2: warning: #warning syscall migrate_pages not implementedstdin:1321:2: warning: #warning syscall pselect6 not implementedstdin:1325:2: warning: #warning syscall ppoll not implementedstdin:1365:2: warning: #warning syscall epoll_pwait not implemented[root@localhost linux-]# 看见几个warning很不爽，解决办法：make下内核就不会出现了。 3.出现MODPOST 1 modules /bin/sh: scripts/mod/modpost: not found错误的解决办法： [root@localhost linux-]# make scriptsCC????? scripts/mod/empty.oHOSTCC scripts/mod/mk_elfconfigMKELF?? scripts/mod/elfconfig.hHOSTCC scripts/mod/file2alias.oHOSTCC scripts/mod/modp