When booting an Oracle Linux 7 bare-metal system with UEK R6, the following may be reported in the dmesg log:

This kernel doesn't handle early microcode load properly (it tries to load
microcode even in virtualised environment, which may lead to a panic on some
hypervisors), thus the microcode files have not been added to the initramfs
image.        

UEK R6 does, in fact, handle late microcode loading properly. The messages are due to a downrev microcode-ctl user space package that does not recognize the UEK R6 kernel version.

This issue is fixed in the microcode_ctl-2.1-61.10.0.1 package or later versions.

(Bug ID 31085618)