Pi4b Headless Boot

Hi

I need to boot the Pi4b without a monitor connected. Using the std ROOL download this seems impossible as the system will not boot unless there is a connected HDMI montor.

Presumably the system is stuck doing an EDID search for a monitor?
*configure monitor 4 should switch this off … However even when so configured, when the monitor is connected the settings are correctly detected, which says it is ignoring the monitor type and relying on EDID come what may.

Surely this is NOT the correct behaviour? … and has anyone got a workaround?

thanks

JB

Surely this is NOT the correct behaviour?

Oh yes it is!! It trips one of up every now and again.

hdmi_force_hotplug=1 in config/txt works here. The Pi defaults to 640×480 HDMI.

There are other way, preset a mode in config/txt? I haven’t tried that recently.

Running a headless Pi has been apain in the **** ever since the P1.

Each time a new build comes out I have to fix it again. Perhaps somebody will fix it once and for allways in 5.30

Aah.. OK.. now to sort what is needed to get desired mode..
Is there a list somewhere of what goes in the config/txt file?
Thanks

Have a look at https://www.raspberrypi.org/documentation/configuration/config-txt/video.md

Thanks David… That is just what I needed
JB

I have the following in my headless Pi:

fake_vsync_isr=1
framebuffer_swap=0
gpu_mem=64
init_emmc_clock=100000000
ramfsfile=CMOS
ramfsaddr=0x508000
kernel=RISCOS.IMG

[pi4]
enable_gic=1

In !Boot the screen configuration is set to Flatron L1910B 1024×768 C16M (i.e. not to native) but with no HDMI monitor plugged in the HDMI system does not power up and the Pi does not hang on boot.

For the headless Pi with an 800×480 touchscreen display I set 800×480 explicitly in config.txt