64-bit RPi4B u-boot hangup with modern rpi firmware: some information (but investigative-toolbox limited)

[Klaus Cucinauomo]

> Am 14.10.2020 um 06:43 schrieb Mark Millard <marklmi at yahoo.com>:
> 
>> …...
> 
> By contrast, what I've done can
> not even show that u-boot ever was started after it was loaded…

I showed that even FreeBSD was started by u-boot with the modernFirmware loaded (when the armstubs are NOT loaded) :
https://dmesgd.nycbug.org/index.cgi?do=view&id=5702

That finding is of course not a bugfix in the armstub but enough to say: u-boot(at least that version shown in dmesg) doesn`t hang up with the modernFirmware