Looks like the odroid has boot blobs, so is unsupportable for now

The relevant quote is 'Boot blobs are in binary format (Limited by Amlogic's policy)'

README.md

 
     freedombone-image -t qemu-x86_64 -s 8G
 
-Other supported boards are cubieboard2, cubietruck, olinuxino-lime, olinuxino-lime2, olinuxino-micro and odroid-c2.
+Other supported boards are cubieboard2, cubietruck, olinuxino-lime, olinuxino-lime2 and olinuxino-micro.
 
 If the image build fails with an error such as "/Error reading from server. Remote end closed connection/" then you can specify a debian package mirror repository manually with:
 

src/freedombone-image-hardware-setup

              -d $initRd uInitrd )
 }
 
-odroidc2_setup_boot() {
-    dtb="$1"
-
-    # Setup uEnv.txt
-    if grep -q btrfs /etc/fstab ; then
-        fstype=btrfs
-    else
-        fstype=ext4
-    fi
-    kernelVersion=$(ls /usr/lib/*/${dtb}.dtb | head -1 | cut -d/ -f4)
-    version=$(echo $kernelVersion | sed 's/linux-image-\(.*\)/\1/')
-    initRd=initrd.img-$version
-    vmlinuz=vmlinuz-$version
-
-    # based on http://odroid.com/dokuwiki/doku.php?id=en:c2_building_u-boot
-    cat >> /boot/uEnv.txt <<EOF
-mmcroot=/dev/mmcblk0p2 ro
-mmcrootfstype=$fstype rootwait fixrtc
-mmcrootflags=subvol=@
-
-console=ttyO0,115200n8
-
-kernel_file=$vmlinuz
-initrd_file=$initRd
-
-loadaddr=0x11000000
-initrd_addr=0x13000000
-fdtaddr=0x1000000
-
-initrd_high=0xffffffff
-fdt_high=0xffffffff
-
-loadkernel=load mmc \${mmcdev}:\${mmcpart} \${loadaddr} \${kernel_file}
-loadinitrd=load mmc \${mmcdev}:\${mmcpart} \${initrd_addr} \${initrd_file}; setenv initrd_size \${filesize}
-loadfdt=load mmc \${mmcdev}:\${mmcpart} \${fdtaddr} /dtbs/\${fdtfile}
-
-m="1080p60hz"
-m_bpp="32"
-
-loadfiles=run loadkernel; run loadinitrd; run loadfdt
-mmcargs=setenv bootargs rootwait rw console=tty0 console=\${console} root=\${mmcroot} rootfstype=\${mmcrootfstype} rootflags=\${mmcrootflags} no_console_suspend hdmimode=${m} m_bpp=${m_bpp} fsck.fix=yes
-
-uenvcmd=run loadfiles; run mmcargs; booti \${loadaddr} \${initrd_addr}:\${initrd_size} \${fdtaddr}
-EOF
-
-    mkdir -p /boot/dtbs
-    cp /usr/lib/linux-image-*-armmp/* /boot/dtbs
-}
-
 a20_setup_boot() {
     dtb="$1"
 
         beaglebone_repack_kernel
         enable_serial_console ttyO0
         ;;
-    odroid-c2)
-        odroidc2_setup_boot meson64_odroidc2
-        enable_serial_console ttyO0
-        ;;
     cubietruck)
         a20_setup_boot sun7i-a20-cubietruck.dtb
         enable_serial_console ttyS0

src/freedombone-image-make

 # Packages needed on the beaglebone
 beaglebone_pkgs="linux-image-armmp u-boot-tools u-boot"
 
-# Packages needed on the Odroid C2 devices:
-odroidc2_pkgs="linux-image-arm64 u-boot-tools u-boot"
-
 # Packages needed on the Allwinner A20 devices:
 a20_pkgs="linux-image-armmp-lpae u-boot-tools u-boot u-boot-sunxi"
 
  --roottype btrfs \
 "
 		;;
-    odroid-c2)
-		extra_pkgs="$odroidc2_pkgs"
-		extra_opts="\
- --variant minbase \
- --bootoffset=2mib \
- --bootsize 128M \
- --boottype ext2 \
- --no-kernel \
- --no-extlinux \
- --foreign /usr/bin/qemu-arm-static \
- --roottype btrfs \
-"
-		;;
     cubietruck | a20-olinuxino-lime | a20-olinuxino-lime2 | a20-olinuxino-micro | cubieboard2)
 		extra_pkgs="$a20_pkgs"
 		extra_opts="\

src/freedombone-image-makefile

 	$(SIGN)
 	@echo "Build complete."
 
-# build Odroid C2 SD card image
-odroid-c2: prep
-	$(eval ARCHITECTURE = aarch64)
-	$(eval MACHINE = odroid-c2)
-	$(MAKE_IMAGE)
-	@rm -f $(ARCHIVE)
-	$(XZ) $(IMAGE)
-	@echo ""
-	$(SIGN)
-	@echo "Build complete."
-
 # build Cubieboard2 SD card image
 cubieboard2: prep
 	$(eval ARCHITECTURE = armhf)