Bb xm

Sorry for disturb. I need activate a spi interface and a pwm on my
beagleboard xm. I tried many times ,recompiling kernel to create a uImage,
but nothing work. Please can you help me to suggest step by step istruction.

Have you read and followed the below links?

I also suggest reading, then providing:
* What you are seeking to do
* What you tried
* What you expected
* What you saw