Disable TTY2-9 in Zenwork Linux Kernel

Hello,

I've created some nice Linux shell script and implemented them via a TFTP
command in de Zen Imaging Linux Kernel. It's a password protected menu
structure. All that is working great but.......

I Want to disable TTY2-9 in the Kernel. I've modified the inittab file
but it didn't workout, there was no mingetty file in de sbin directory.
I've placed an mingetty file in the sbin dir but no results.

Anyone out there who has an idea how to disable TTY2-9?

Thanks and regards,
Maurice