I've successfully build a custom linkit smart 7688 firmware but when I'm trying to flash it, the process starts and then stuck after 15-20 seconds in the middle of flashing. This behavior is consistent for the specific firmware image. When I do reboot after such flashing there nothing shows in serial console. What can be the reason of that freezing in the middle of firmware flashing?
Update: Actually, it seems did flash the firmware. What is odd is that flashing process took a half of minutes instead of 3 minutes as usual despite that size of the image was even bigger.