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Why don't printk command come out on my etrax board?

I have made a kernel module that works fine on my pc. But I have trouble
getting it to work with the RS485 interface. 
So wanted to have some debugging messages, but they don't appear, I have
tried to set the /proc/sys/kernel/printk to 8, but still no messages, nor in
the /var/log/messages

How can I get these debug messages?

And do any of you now of some example code the uses the RS485 interface,
from inside the kernel?

Martin Hansen
Student at SDU Sønderborg. www.sdu.dk
Writing final project at Danfoss drives. www.danfossdrives.com

Tlf: 74 88 54 62