RPI4 status: - boot via UEFI_VER=v1.17 copy pre-setted RPI_EFI.fd serial ,should not set graphical
I had made my own boot image a while ago with older version 1.14 UEFI, but the serial console didn't work:
http://mail-index.netbsd.org/port-arm/2020/07/15/msg006881.html With your image, the serial console works properly. Thanks! John