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</head>

<body style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">

<div style="direction: ltr;">

<div style="direction: ltr;">Hi,</div>

<div><br>

</div>

<div style="direction: ltr;">Thanks, I will check it.</div>

<div><br>

</div>

<div style="direction: ltr;">Did you try adding “enable_uart=1” to config.txt?</div>

<div style="direction: ltr;">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.</div>

<div><br>

</div>

<div style="direction: ltr;">~Álvaro.</div>

</div>

<div>

<hr style="display:inline-block;width:98%" tabindex="-1">

<div id="divRplyFwdMsg" dir="dir="ltr""><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>De:</b> Rafał Miłecki <zajec5@gmail.com><br>

<b>Enviado:</b> lunes, septiembre 2, 2019 4:08 p. m.<br>

<b>Para:</b> Álvaro Fernández Rojas; OpenWrt Development List<br>

<b>Asunto:</b> RPi Zero W: broken serial since 4.19 switch

<div> </div>

</font></div>

Starting with the commit 42954857190b ("brcm2708: add linux 4.19<br>

support") I don't get any output over my Raspberry Pi Zero W serial<br>

console. OpenWrt still boots fine (I can see full bootlog on a screen).<br>

<br>

I tried debugging that but it doesn't seem to be anything obvious.<br>

Comparing kernel configs (4.14 vs. 4.19) and decompiled .dtb files<br>

doesn't ring any bell for me.<br>

<br>

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

<br>

I'm attaching 4 files.<br>

good-*: files from 4.14 kernel from 42954857190b~1<br>

bad-*: files from 4.19 kernel from 42954857190b<br>

<br>

-- <br>

Rafał<br>

</div>

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