I'm had successfully flashed android demo package from atmel for sama5d3 xplained ,but now i'm trying to build a custom android images for sama5d3 xplained with the guidance from the Android4sam website, i had used android kitkat 4.4.2 source to build android filesystem and used kernel from atmel ,but the system fails to boot android filesystem,i.e, board has no response other than continuous blinking blue led