Samsung Galaxy S3 with fastboot I have a Samsung Galaxy S3 (international and unlocked). I recently downloaded the kernel source code from Samsung's website and have successfully compiled and now have a zImage file. My problem is what to do with it?

I have seen people saying to use fastboot boot zImage to test that the kernel works before more permanently flashing it with fastboot boot zImage zImage but fast boot wont recognise my phone. When i type fastboot devices i get nothing. fastboot reboot (i think that was it) sits there for ever waiting for the device.

I have also tried adb just to prove a point. This sees the device with adb devices (while the phone is in normal mode) but still didnt help. 

I currently have the Clockwork recovery mod installed. Could this be causing issues? and if so how do i remove it?

Everything i have seen says to boo the device into fast boot mode. Is this Download/Odin mode on the S3?

Thank you

Adrian

EDIT:
Forgot to mention i have tried this on Ubuntu 12, OSX 10.8 ans Windows 7 with drivers installed
I have ended up installing mobile Odin and just performing a recovery with the clockwork mod if the kernel kills the phone (which is all i have managed to do so far)
Thanks for your help