Symfony 2 -security.yml: How to create an exception pattern inside the firewalls?

example: I have this inside my firewalls

secured_area: pattern: ^/ form_login: check_path: /secured/login_check login_path: /secured/login logout: path: /secured/logout target: / context: primary_auth

I would like to access to this pattern => ^/toto without login.

Please, help me ?