So, I made the change to "kvariant", and installed the kernel, but something broke and I had to manually restore the /boot partition with files from another Pi. If anyone needs to fix his install, I recommend to yum reinstall raspberrypi2-kernel-firmware raspberrypi2-firmware and yum reinstall raspberrypi2-kernel-4.9.64
Another thing I noticed is that the config.txt supplied by the CenOS distro sets arm_freq=700 This is disasterous if you are running an RPI3 :) Here is the setup I'm using for my little RPI3 Samba Domain controllers: ---
hdmi_safe=1
#overclock rpi3 moderately #https://github.com/retropie/retropie-setup/wiki/Overclocking total_mem=1024 arm_freq=1300 gpu_freq=500 core_freq=500 sdram_freq=500 sdram_schmoo=0x02000020 over_voltage=2 sdram_over_voltage=2
#minimum video ram gpu_mem=16
#disable wifi and bluetooth dtoverlay=pi3-disable-wifi dtoverlay=pi3-disable-bt
#fast sd card, only for UHS cards #(may prevent booting, have tools on hand to revert this) #dtparam=sd_overclock=100 #boot_delay=2