[syslinux] isolinux and multiple serial consoles

[iSteve]

Greetings,
I'm using isolinux and I'd like to make it spawn serial consoles to all four
devices (ttyS{0..3} / COM{0..3})... if spawning on just one (serial 0 38400),
everything works great, however, should I attempt to spawn on all four, no
console is available at all. How come?

The relevant part of isolinux.cfg:
serial 0 38400
serial 1 38400
serial 2 38400
serial 3 38400

Thanks in advance
-- 
 -- iSteve