How to update only my Kernel not the entire ROM

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http://forum.xda-developers.com – So right now my phone is running android 4.04. So I checked out the entire android 4.04 ics branch from the aosp project: repo init -u h t t p s : / /android.googlesource.kom/platform/manifest -b android-4.0.4_r2.1 And then I go ahead and download the kernel source, change a few options in tuna_defconfig, make the kernel, and copy the zImage to the file: devices/samsung/tuna/kernel Now what? I know that in theory, I could build the entire AOSP project -- but I lack the proprietary binaries. How can I just get my updated kernel onto the device smoothly? PS: I've done fastboot b (HowTos)