Auto-start my aplication with control of console ttyO0

Hi at all,

my aplication start with the booting, like a service,
and I want use the console ttyO0 for it only, I don’t want view any promt of linux.
I want use that console for input and output by screen and keyboard with my aplication,
how Can I do that?

I have added a new service for autologin, and I have avoid the login in linux…but I don’t know how to continue…

What is the better way to do that?

Thank you in advanced.