eliloconfig broke?
 

Doesn't write boot entry to boot list.

EFI_DEVICE=$(mount | grep vfat | grep -w /boot/efi | cut -b 1-8)
EFI_PARTITION=$(mount | grep vfat | grep -w /boot/efi | cut -f 1 -d ' ' | cut -b 9-)
efibootmgr -q -c -d $EFI_DEVICE -p $EFI_PARTITION -l "\\EFI\\Slackware\\elilo.efi" -L "Slackware".
writes the boot entry to the boot list as it should.

eliloconfig has worked in the past.

I can confirm this. I did an install on a desktop PC in UEFI mode, the Slackware installed properly and even placed the elilo.efi on the EFI partition, but I had to manually register the efi binary into the UEFI firmware settings.

However, a strange thing I experienced is that the same Slackware64 14.2 bootable USB installed the ELILO and registered it properly on another machine. It could be that the UEFI implementation varies on different machines, so sometimes it does not work.

So far I have had 3 Windows updates and 1 Dell update that have raped the EFI (sda1) partition.
fsck.msdos -aw /dev/sda1 fixes this issue.
Both elilo and grub work properly now.