Later under "RPI4 xhci" is mentioned One workaround is to switch to UEFI, but that leads to a 3GB memory limit and needing a monitor. Is this still accurate? Is it impossible to use a serial console when booting using the UEFI boot image? And is the 3GB memory limit still a thing? Makes it kind of pointless to try to run on an 8GB RPI5, no?The 3GB issue is a hardware flaw of the RPI4. Setting the UEFI limit was an early crude workaround. It shouldn't be required anymore.
I confirm my RPi4 runs perfectly with 8 GB RAM with UEFI v1.38 (3GB limit disabled). Avoid v1.39, at least it did not work for me.
Regards. Ramiro.