Booting RPi5B with latest git

[John]

I am running Arch ARM on a RPi4B and also on a RPi5B. My RPi4B can boot the vanilla kernel package (linux-aarch64) with the latest uboot-raspberrypi (2024.04-rc2) just fine. Yet, if I take that uSD card and place it in my RPi5B, it does not boot. I only see the "U-Boot" submarine logo in the upper right of the screen/no debug output. Any thoughts are appreciated.

I built u-boot like this:

unset CFLAGS
unset CXXFLAGS
unset CPPFLAGS

make rpi_arm64_config
echo 'CONFIG_IDENT_STRING=" Arch Linux ARM"' >> .config
make EXTRAVERSION=-2024.04rc2