[gentoo-user] Where is CONFIG_MICROCODE gone in kernel 4.4.6-gentoo?

[Mick]

I seem to have mislaid my microcode somewhere, in the latest stable gentoo 
kernel:

# grep -i MICROCODE .config
#

As a result I get this during boot:

# /etc/init.d/microcode_ctl start
 * Updating microcode ...
microcode_ctl: cannot open /dev/cpu/microcode for writing errno=2 (No such 
file or directory)
 * Failed to update microcode via '/dev/cpu/microcode'                                                                                                                                  
[ !! ]
 * ERROR: microcode_ctl failed to start


The previous kernel contained this:

# grep -i MICROCODE /boot/config-4.1.15-r1-gentoo 
CONFIG_MICROCODE=y
CONFIG_MICROCODE_INTEL=y
# CONFIG_MICROCODE_AMD is not set
CONFIG_MICROCODE_OLD_INTERFACE=y


Is there something else I ought to switch on first?

-- 
Regards,
Mick