Why is there no console/log output from my driver?

I am creating my first driver. I've followed the example in <https://developer.apple.com/library/mac/#documentation/Darwin/Conceptual/KEXTCon cept/KEXTConceptIOKit/iokit_tutorial.html>.
I set all my permissions, ran kextutil, and used kextload without errors. But there are no IOLog messages in </var/log/system.log>.
Why?

(1) Yes, the messages will be found in /var/log/kernel.log
(2) No idea what "fixed" this, but I unloaded my KEXT, re-built, re-loaded, and voilá!
Although I quoted <system.log>, I was actually looking in the Console app under "All Messages". The problem was that the messages just weren't there. Perhaps the KEXT wasn't being run for some reason.

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