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Published 20 hours ago • verified publisher icon agherzan

Incorrect baudrate on UART using RPI Zero W

Open definable opened this issue 3 years ago • 4 comments

Core image base with U-boot has a 'non standard' baudrate on the serial port

Steps to reproduce the issue:

  1. Bitbake core-image-base with MACHINE raspberrypi0-wifi
  2. Check UART (GPIO14/GPIO15) output

Describe the results you received: bit time measured: approx 13.9us. Configured terminal application to 71942 bit/s, which operated correctly with this baudrate.

Describe the results you expected: 115k2 or another standard baudrate.

U-boot version: 2020.01

definable avatar May 02 '22 16:05 definable

What kernel version are you using? Is it the default 5.15? If yes, can you try with 5.10?

agherzan avatar May 04 '22 17:05 agherzan

Sorry my mistake. I should have mentioned it is the u-boot UART. I do not have a console UART configured for the kernel.

definable avatar May 05 '22 16:05 definable

In that case, I would follow up on the u-boot mailing list about this issue. Otherwise, I'd try similar tests on the Linux side to verify the hardware. If that doesn't work either, it's worth testing without having u-boot in the mix.

agherzan avatar May 09 '22 00:05 agherzan

@definable Any news on this issue?

agherzan avatar Jul 29 '22 22:07 agherzan