EBC Exercise 26 Device Drivers
Chapter 8 of the text  gives a nice example of a minimal device driver. The purpose of this lab is to implement that driver.
Minimal Device Driver Example
Follow the 5 steps given in section 8.1.4 on page 205. You can get a copy of Listing 8-1 here (ECE497_Listings_for_Embedded_Linux_Primer_Chapter_8). Once finished you will have a file called
.../drivers/char/examples and have the kernel configure file and Makefile updated for the new driver. See section 4.4 on page 89 for help with modifying the config files.
Note: There is a typo in Listing 8-2.
If you have created the crossCompileEnv.sh file and sourced it, all you have to do to make the modules is cd to the top of the kernel directory and then:
$ make modules
Mine took a while the first time as it appears to compile all the modules.