Hi I was following this tutorial step by step, but after flashing to a SD-Card the rainbow screen appeared for about a second. After that it just shuts off the HDMI with the "No Signal" text. However I can access the console by UART so I know it is booting.
My config.txt:
kernel=Image.gz
arm_64bit=1
dtparam=audio=on
dtoverlay=vc4-kms-v3d-pi4,noaudio
#dtoverlay=dwc2,dr_mode=peripheral
initramfs ramdisk.img followkernel
enable_uart=1
disable_overscan=1
Also tried:
hdmi_force_hotplug=1
hdmi_group=1
hdmi_mode = 76