Tokina 28mm f2.8 SL chipped!!!
I have a Nikon D90 and it can not neither meter nor confirm focus unless it has a CPU lens attached.
Furthermore it can be used only in manual mode. Same thing happen with entry level DSLR.
So I got the chip, and I copied where and how to place it looking at a Nikkor lens.
See my other photos to get the full process.
Here is the result: