elilo.conf

chooser=simple
# interactive mode
prompt
# delay when not in interactive mode (0.1 sec)
delay=100
# timeout when in interactive mode (0.1 sec)
timeout=100
default=vmlinuz
#
image=vmlinuz
label=vmlinuz
read-only
append="root=/dev/sdc2 vga=normal ro"

image=vmlinuz-generic
label=vmlinuz-generic
initrd=initrd.gz
read-only
append="root=/dev/sdc2 vga=normal ro"

image=vmlinuz-huge-5.15.27
label=huge-5.15.27
read-only
append="root=/dev/sdc2 vga=normal ro"

image=vmlinuz-generic-5.15.27
label=generic-5.15.27
initrd=initrd-5.15.27.gz
read-only
append="root=/dev/sdc2 vga=normal ro"

Show modules in mkinitrd

mkdir /tmp/initrd
/tmp/initrd
cp /boot/initrd.gz .
gunzip initrd.gz
cpio -id < initrd

# mkinitrd.conf.sample
# See "man mkinitrd.conf" for details on the syntax of this file
#
#SOURCE_TREE="/boot/initrd-tree"
#CLEAR_TREE="0"
#OUTPUT_IMAGE="/boot/initrd.gz"
#KERNEL_VERSION="$(uname -r)"
#KEYMAP="us"
MODULE_LIST="ext4:hv_vmbus:scsi_transport_fc:hv_storvcs:jbd2:mbchache"
#LUKSDEV="/dev/sda2"
#LUKSTRIM="/dev/sda2" # verify support with 'hdparm -I $dev | grep TRIM'
#LUKSKEY="LABEL=TRAVELSTICK:/keys/alienbob.luks"
ROOTDEV="/dev/sda2"
ROOTFS="ext4"
#RESUMEDEV="/dev/sda2"
#RAID="0"
#LVM="0"
#UDEV="1"
#MODCONF="0"
#MICROCODE_ARCH="/boot/intel-ucode.cpio"
#WAIT="1"

mkinitrd -F -k 5.15.63
or
/usr/share/mkinitrd/mkinitrd_command_generator.sh -k 5.15.63
cp /boot/initrd.gz /boot/efi/EFI/Slackware/
cp /boot/vmlinuz-generic-5.15.63 /boot/efi/EFI/Slackware/vmlinuz

cp /boot/initrd.gz /boot/efi/EFI/Slackware/initrd-5.15.63.gz
cp /boot/vmlinuz-generic-5.15.63 /boot/efi/EFI/Slackware/vmlinuz-5.15.63