FWIW, I bought an ODROID-HC2 this week and though I'd share my findings with 
the most current versions from rawhide on my F29 x86_64 which has 

> I don't believe you need
> "rd.driver.pre=ledtrig-heartbeat,xhci-plat-hcd" bit for F-29 but I
> don't have a device to test.

I tested the LED part with rawhide packages on my F29 x86_64
* arm-image-installer-2.10-1.fc29.noarch
* uboot-images-armv7-2019.01-1.fc30.noarch
* kernel-4.18.16-300.fc29.armv7hl

The board boots fine, no need to symlink.
As long as I have `cpuidle.off=1` (without it the board gets stuck during boot)

I do need both `rd.driver.pre=ledtrig-heartbeat` and preloading with

cat <<EOF >>/etc/dracut.conf.d/ledtrig-heartbeat.conf
add_drivers+=" ledtrig-heartbeat "
EOF

To get heartbeat LED functionality, after re-doing initramfs LED shows alive 
from early in boot process on, exactly what I need at the moment.

I still need to check if rd.driver.pre=xhci-plat-hcd is needed. At the moment 
the board has no disk connected, only µSD card


Exact command used;
sudo fedora-arm-image-installer \
  --target=none \
  --image=Fedora-Minimal-armhfp-29-1.2-sda.raw.xz \
  --addkey=/home/pcfe/.ssh/id_USBkey.pub \
  --args "console=ttySAC2,115200n8 cpuidle.off=1 
rd.driver.pre=ledtrig-heartbeat,xhci-plat-hcd no_bL_switcher" \
  --media=/dev/sdi
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