hd44780 how to use with 4 lines lcd ?

[fdelbos]

Before I used to do the following call to setup the display on a 2 lines 16 chars lcd:

hd44780.New(connection, hd44780.RowAddress16Col, hd44780.TwoLine)

Now I bought a 4 lines 20 chars display, but I don't know how to set it right...
Any example?

Thank you.