Booting without an attached monitor

[K1lo]

Is there a requirement for the Pito detect a screen at startup? I understand from browsing the forum the HDMI output needs to be connected on startup if you intent on using the connection, but what about if you wanted to run a headless system?

[RaTTuS]

if you want a headless system then just boot it with the minimum memory to the GPU ..

if the RPi detects a HDMI monitor then it will use that otherwise it uses the video connector

you do not need a monitor if you just want to run it as a server

[Dave_G_2]

I have also wondered about this, so thank you for the clarification RaTTus.

One thing that is still not clear to me is, does the existence of a HDMI monitor and the info the Pi receives over the EDID over-ride any settings to do with the video resolution that I might have set in config.txt or is it the other way round?

Also, if no HDMI is detected, does the Pi default to PAL or NTSC on the composite output assuming I have no reference to this in config.txt?

[RaTTuS]

the config.txt overrides the EDID AFAIK

and PAL IIRC

I dont have an RPi so YMMV

[Dave_G_2]

Many thanks