I haven't actually shown anything yet. So keep your hat on. I am trying to work out why it's not working. I'm sure my maths is right.

Before anyone offers help, I'd like to have a bit more of a go myself first. I like a challenge.

(edit) Getting closer. Anyone know how to quickly rebuild the kernel. It seems I have to do a make dep;make clean;make zImage everytime to ensure my changes stick. Takes much longer than just make zImage. And make zImage is definitely recompiling the file I have changed.