[PATCH u-boot-marvell 00/13] Yet another kwboot improvements

[Pali Rohár]

On Wednesday 27 October 2021 17:27:41 Stefan Roese wrote:
> Still I see no speed change. But this is a different story...

Could you try to upload some file in u-boot via xmodem at different
speeds? E.g. via loadx command:

loadx <addr> 921600

and

loadx <addr> 115200

And compare if xmodem transfer is in U-Boot faster or not. Ideally also
try via kermit protocol at different speeds as kernel supports
streaming.

This could verify if issue is in kwboot or in USB-UART/kernel.