Yes, I used fc29 though; fc28 should have worked fine too I think. This is straight from memory the rough idea was:
I used the Ubuntu image that Hardkernel provided as a host for a chrooted fedora 29 environment to build an initial ramdisk using dracut.
* copied the Ubuntu /lib/modules/3.16.x-lts directory into the chroot env and built the initramfs using dracut * created a fc29 sd card or emmc card using dd xzcat $image | dd bs=4M of=${device} iflag=fullblock oflag=direct status=progress; sync * placed the kernel, initramfs, dtb and the /lib/module/3.16.x-lts directory in the correct spots on the sd card * updated the fc29 sdcard SPL/u-boot bits from hardkernel at the beginning of the card
I had even got X working as well as the RTC module with minimal effort.
Regards,