Search notes:

Kernel compilation: make install

make install installs the kernel using ~/bin/installkernel or (distribution) /sbin/installkernel or install to $(INSTALL_PATH) and run LILO.
On the other hand, it also seems like make install calls scripts/install.sh
The script that is invoked to install the kernel can be overridden by setting the environment variable INSTALLKERNEL.

See also

/sbin/installkernel
arch/x86/boot/install.sh

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