Download and compile the following https://github.com/pftf/RPi4.git. I made the following change to edk2-platforms
to always enable 3GB RAM+ as TFTP booting this seems to cause issues with it remembering the options.
diff --git a/Platform/RaspberryPi/RPi4/RPi4.dsc b/Platform/RaspberryPi/RPi4/RPi4.dsc
index c481c35342..4b495b1fe8 100644
--- a/Platform/RaspberryPi/RPi4/RPi4.dsc
+++ b/Platform/RaspberryPi/RPi4/RPi4.dsc
@@ -495,7 +495,7 @@