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document updated 14 years ago, on Sep 9, 2009
(note: this document only applies to ROM booting specifically. If you boot from removable media, this prompt is never seen)

Different versions of gPXE will display different initial messages:

If your version uses the first message (press B), then UNATTENDED BOOTING IS IMPOSSIBLE. You'll have to upgrade to a newer version (to the "press N" one) if you want to be able to do unattended booting.

source code

This is the diff that made this change from "B" to "N", it modified src/arch/i386/prefix/romprefix.S. It's a small diff, so it's easy to change this behavior.

Specifically, if you don't want this behavior on newer versions of the code, it's easy to revert to the previous behavior.

(though they really should make it an #ifdef with an entry in config/*.h)