Linux driver development error sorting

Source: Internet
Author: User
1) solve the inconsistency between version magic

Original article: http://blog.sina.com.cn/s/blog_7d638eda010118rh.html

Http://tldp.org/LDP/lkmpg/2.6/html/x380.html

After compiling a kernel module, if the machine that installs the module runs a different kernel, it will report

 
Insmod: Error inserting 'poet _ atkm. Ko ':-1 invalid module format. Take a closer look at the/var/log/message file and you can find that the version magic is inconsistent.
 
Jun 4 22:07:54 localhost kernel: poet_atkm: Version magic '2. 6.5-1.358 custom 686 regparm 4 kstacks gcc-3.3 'could be '2. 6.5-1.358 686 regparm 4 kstacks gcc-3.3'

In fact, you can change the value in makefile to the existing one with the same kernel.

 
Version = 2 patchlevel = 6 sublevel = 5 extraversion =-1.358 custom

(Remove the above M and re-compile and burn the kernel)

2) Unknown symbol _ aeabi_unwind_cpp_pr0

Original article: http://johnmcu.blog.163.com/blog/static/17244625620109140555239/

"I am very depressed. Through customer service, I thought it was a cross-compiler problem at the beginning. However, after the test, the cross-compiler is normal and will crash soon, I burned the image provided by the CD in my Development Board, and the driver I transplanted myself was generated in my own kernel. ko file, resulting in a fatal error,The module and kernel image do not matchLater, I burned my own kernel and file system. Despite the many twists and turns, I finally kept the cloud open to see the moon, and finally I could load and uninstall the module !"

3) Automatic Generation of character Device Files

When I drive a character deviceArticleThe driver that automatically creates the character device file is written. As a result, each time the driver is loaded, the generated device file is a block device file instead of a character setting file.

So I decided on the Cross-compilation tool in the friendly version 4.3.2,Then re-compile your own kernel to build the root file system.And then mount the driver at the next time. Everything is OK !!!!

4) Request_ IRQ
Return Value-16

Original article: http://blog.sina.com.cn/s/blog_636a55070101j9t8.html

When the touch screen driver was written according to the video of phase II of Wei Dongshan, The request_irq returned-16, which indicates that the interrupt was occupied.

Solution: Add ir1_shared to flags of the request_irq function. Do not leave the last parameter blank and use free_irq on one side.

Therefore, writeProgramYou must check the return value to find the error as soon as possible.

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