Re: Problem with UART in U-Boot.

[Yao Zi <ziyao@disroot.org>]

On Sat, Mar 22, 2025 at 06:49:11PM +1000, . wrote:
> Device: Orange Pi 5.
> > U-Boot is installed in the SPI memory. I connected the device to my laptop via UART, CH340G adapter, 1500000 baud rate. Connected: gnd-gnd, tx-rx, rx-tx.

Are you sure your serial adapter works at the same voltage level as your
board? It sounds like an electrical/hardware problem instead of fault of
U-Boot code.

> > As a result, when connecting a more powerful power supply, the output to the terminal works, but the input does not work from the word at all.
> > When connecting a less powerful power supply, the input works partially: there was an inscription like "press any key to interrupt startup", I pressed Enter and everything worked, but when I tried to enter something, either question marks (�) were entered, or nothing was entered, or even the text was erased.
> >
> > When installing EDK2-RK3588 (UEFI) instead of U-Boot, both input and output worked on any power supply, and everything worked fine, the speed was the same — 1500,000 baud, and the same adapter.
> >
> > It is necessary to install U-Boot. Can you tell me how to fix the input in U-Boot? Version v2025.01.
>    - 0 '

Thanks,
Yao Zi