[OpenWrt-Devel] RPi Zero W: broken serial since 4.19 switch

Álvaro Fernández Rojas noltari at gmail.com
Mon Sep 2 10:50:22 EDT 2019


Thanks, I will check it.

Did you try adding “enable_uart=1” to config.txt?
I removed it from config.txt because according to https://www.raspberrypi.org/documentation/configuration/uart.md it affects the core frequency slowing down some models.

De: Rafał Miłecki <zajec5 at gmail.com>
Enviado: lunes, septiembre 2, 2019 4:08 p. m.
Para: Álvaro Fernández Rojas; OpenWrt Development List
Asunto: RPi Zero W: broken serial since 4.19 switch

Starting with the commit 42954857190b ("brcm2708: add linux 4.19
support") I don't get any output over my Raspberry Pi Zero W serial
console. OpenWrt still boots fine (I can see full bootlog on a screen).

I tried debugging that but it doesn't seem to be anything obvious.
Comparing kernel configs (4.14 vs. 4.19) and decompiled .dtb files
doesn't ring any bell for me.

Any idea what may be a reason for that? How to debug that?

I'm attaching 4 files.
good-*: files from 4.14 kernel from 42954857190b~1
bad-*: files from 4.19 kernel from 42954857190b

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