If you are talking about serial console, there is a special "USB to 1.8V LVTTL serial dongle" you can buy or build. Then use it on the special Braswell I/O connector CN15 outer edge. Basically you are using another compute device's (COMx port <-- USB-serial dongle device) to communicate with UDOO x86's COM1 port, probably thru Hyper Terminal software. However, you really do not need to go that far (and kind of extreme.) Just use the single user / cmdline mode as root to fix your boot up problem. ccs_hello
