I noticed the following messages on the console at boot:
Found /extlinux/extlinux.conf
Retrieving file: /extlinux/extlinux.conf
515 bytes read in 111 ms (3.9 KiB/s)
Ignoring unknown command: ui
Ignoring malformed menu command: autoboot
Ignoring malformed menu command: hidden
Ignoring unknown command: totaltimeout
Fedora-Xfce-armhfp-23-20151024 Boot Options.
1: Fedora-Xfce-armhfp-23-20151024 (4.2.3-300.fc23.armv7hl)
Here is /boot/extlinux/extlinux.conf
# extlinux.conf generated by appliance-creator
ui menu.c32
menu autoboot Welcome to Fedora-Xfce-armhfp-23-20151024. Automatic boot
in # second{,s}. Press a key for options.
menu title Fedora-Xfce-armhfp-23-20151024 Boot Options.
menu hidden
timeout 20
totaltimeout 600
label Fedora-Xfce-armhfp-23-20151024 (4.2.3-300.fc23.armv7hl)
kernel /vmlinuz-4.2.3-300.fc23.armv7hl
append ro root=UUID=69e9671f-a94f-4dec-bca2-bf97718397af
fdtdir /dtb-4.2.3-300.fc23.armv7hl/
initrd /initramfs-4.2.3-300.fc23.armv7hl.img
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