sulogin: no password entry for root

default console device is not set properly in inittab
Set tty device in inittab , for example

if console was set as

::respawn:/sbin/getty 115200 ttyO0

in inittab and you started with ttyO2,  then

sulogin: no password entry for root

message shows

set

::respawn:/sbin/getty 115200 ttyO2

you can log in properly