I’m working on SOM’s of colibri IMX7D ,colibri IMX6ULL . I have build images for my target boards and flashed without any password for “root” login.It worked well for some duration but suddenly root login started to ask password(no password for my image build).Now i’m unable to login .
One way i tried is , i re-flashed the image and now working fine.Going through some forums i found it may be due low availability of memory in rootfs. So, what i tried is after re-flashing i copied file which logs the data continuously to increase the memory . After sometime memory size is full file stop logging data due to no available free space and I was able to login as root successfully(no password asked).
What made the login root to ask password is still unknown ???