No serial after bootup

Hi Everyone,

Building goes fine as usual.
I am able to connect to serial adapter and see it booting, the dmesg stuff scrolls nicely.
When the booting is done, no serial is started actually on ttyS0......
I can only get an active session by doing doing ssh into the acm3200.
Did I forget to add a package or should I change a kernel config parameter, perhaps /etc/inittab?