rpi-update will will give you the most recent kernel, drivers, firmware, etc from it's target repository. I have 3 pi's running with slackware arm current and each one has had rpi-update run on it after installing slackware arm.
rpi-update is made specifically to do that and it takes care of all the necessary housekeeping as long as you have your vfat boot partition, i.e. /dev/mmcblk0p1 mounted as /boot.
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