I just built the sample character driver from Dave Hyland.

http://docwiki.gumstix.org/Kernel_programming

I get the following errors when trying to load it:

# insmod char-driver.ko
char_driver: Unknown symbol class_destroy
char_driver: Unknown symbol class_create
char_driver: Unknown symbol class_device_create
char_driver: Unknown symbol class_device_destroy
insmod: error inserting 'char-driver.ko': -1 Unknown symbol in module
#

I am running build-root Rev 1088 with the default kernel. Am I missing an option in the kernel?