Comment # 39 on bug 922529 from Thomas Renninger

You have installed onto the eMMC device? So the rootfs is there, but you cannot
boot into it after installation?
Then boot into a rescue or live DVD system.
I often do below with a rescue system, may  also work with a live DVD.
It should work like this:

You can access the rootfs on the eMMC, say it is /dev/mmc0
Then do:
mkdir /emmc
mount /dev/mmc0 /emmc
mount /dev /emmc/dev -o bind
chroot /emmc

 add a file:
/etc/dracut.conf.d/05-eMMC.conf

and add this line:
add_drivers+="shpchp sdhci sdhci-pci"

then call "dracut" and restart with the newly generated initrd and try to boot
directly into the eMMC device.

Hope I did get your setup correctly. Please correct me if not.