Locate kernels available on the system and load one using kexec.

load_kernel

#!/bin/sh

if [ $# -ne 1 ]; then
    echo "Usage: $0 <kernel>"
    echo;
    echo "Available kernels:"
    ls /boot/vmlinuz-* | cut -d'-' -f2- | sed 's/^/     /'
    exit 0;
fi

VERSION=$1

kexec -l /boot/vmlinuz-$VERSION --initrd=/boot/initrd.img-$VERSION --reuse-cmdline
if [ $? -eq 0 ]; then
    echo "Loaded Linux-$VERSION. Run 'kexec -e' to execute it."
fi