Choose between Raspberry Pi 4B 4GB and ROCKPro64

[Klaus Küchemann]

<<<Walter: <<Do you know the bps rate used by u-boot and later components?
.... >
John: <<It's 1.5Mbps, aka 1500000. >> 
Klaus : 
I`m using a 'special hacked version' of u-boot-2019.10 but I would be
surprised if the version from sysutils/u-boot-rockpro64/ would use 1500000
... 
'minicom -D /dev/(yourdev) -b 115200 8N' does it for me. 
UART is the same as on the Original RPI : Pin 6 : GND / Pin 8: TX / Pin 10:
RX 
you must connect TX to RX on the other device(USB->UART or another SBC like
RPI). >>>
------
to add: connecting the RockPRO64 directly to e.g. RPI via UART will allow to
use 1500000 if that's really set in sysutils/u-boot-rockpro64/ 
but be careful: because of a misdesign of the RPI one wrong metal-touch on
the 5V will burn the RPI-chip.
Regards 
Klaus





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