f you don't have those utils here is the git :
git clone --depth 1 https://github.com/naobsd/rkutils
Compile them and you are set to go, after compiling the kernel you can do something like this:
../rkutils/rkcrc -k arch/arm/boot/Image ../kernel-`date +"%m_%d_%Y"`.img
(change the path to rkcrc, thisi will append date string to kernel filename)
PS. first try to build / run kernel without any modification, after you confirm it's working you should continue to add drivers etc. Be careful that the kernel doesn't grow over the kernel partition size
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