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Subject: Re: Choose between Raspberry Pi 4B 4GB and ROCKPro64
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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).













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