Use console variable

src/freedombone-image-hardware-setup

@@ -228,7 +228,7 @@ EOF
     else
         cat >> /boot/boot.cmd <<EOF
 scsi scan
-setenv bootargs init=/lib/systemd/systemd console=ttyO0,115200n8 root=/dev/${arm_root_device} panic=10 rootflags=subvol=@ ro ${fstype} rootwait fixrtc earlyprintk ifnames=0 slub_debug=FZP slab_nomerge page_poison=1
+setenv bootargs init=/lib/systemd/systemd console=${arm_boot_console} root=/dev/${arm_root_device} panic=10 rootflags=subvol=@ ro ${fstype} rootwait fixrtc earlyprintk ifnames=0 slub_debug=FZP slab_nomerge page_poison=1
 fatload ${arm_boot_device} ${arm_fdtaddr} /dtbs/${dtb}.dtb
 fatload ${arm_boot_device} ${arm_loadaddr} ${vmlinuz}
 fatload ${arm_boot_device} ${arm_initrd_addr} ${initRd}