algebro
Posts: 5
Joined: Tue Aug 13, 2019 2:56 pm

Raspberry Pi 4 Serial/UART text out-of-order

Wed Aug 14, 2019 2:57 pm

Hey all,

I got a serial connection working over UART on my Pi 4, and the text is all printable using 115200 baud, but the text is all jumbled and out of order. I remember there being similar issues related to the clock speed in the Pi 3, but I'm wondering if anyone has had to make similar adjustments on the Pi 4. Does anyone have any suggestions on what to try?

Thanks!

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rpiMike
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Location: Cumbria, UK

Re: Raspberry Pi 4 Serial/UART text out-of-order

Wed Aug 14, 2019 3:01 pm

Is your Raspbian Buster fully updated? There was a bug fix for baud rate on the Pi4.

algebro
Posts: 5
Joined: Tue Aug 13, 2019 2:56 pm

Re: Raspberry Pi 4 Serial/UART text out-of-order

Wed Aug 14, 2019 3:03 pm

I'm running Kali ARM currently, can you tell me exactly which package has the bug fix? I'll see if I can install it there or cherrypick the patch for the Kali project. Thanks!

algebro
Posts: 5
Joined: Tue Aug 13, 2019 2:56 pm

Re: Raspberry Pi 4 Serial/UART text out-of-order

Mon Aug 19, 2019 5:57 pm

Going to bump this thread since this issue is becoming somewhat urgent

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B.Goode
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Location: UK

Re: Raspberry Pi 4 Serial/UART text out-of-order

Mon Aug 19, 2019 6:46 pm

algebro wrote:
Mon Aug 19, 2019 5:57 pm
Going to bump this thread since this issue is becoming somewhat urgent


Maybe seek help from a forum that is dedicated to supporting your third-party Operating System: https://forums.kali.org/

algebro
Posts: 5
Joined: Tue Aug 13, 2019 2:56 pm

Re: Raspberry Pi 4 Serial/UART text out-of-order

Mon Aug 19, 2019 7:00 pm

Maybe seek help from a forum that is dedicated to supporting your third-party Operating System: https://forums.kali.org/
See my question above about which project/commit within Raspbian contained the Baud rate fixes. Has nothing to do with Kali and is perfectly appropriate for this forum.

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DougieLawson
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Re: Raspberry Pi 4 Serial/UART text out-of-order

Mon Aug 19, 2019 8:30 pm

Are you able to run sudo rpi-update on Kali?

That will get you 4.19.66 which will include the UART clock rate fixes.
Note: Having anything humorous in your signature is completely banned on this forum. Wear a tin-foil hat and you'll get a ban.

Any DMs sent on Twitter will be answered next month.

This is a doctor free zone.

algebro
Posts: 5
Joined: Tue Aug 13, 2019 2:56 pm

Re: Raspberry Pi 4 Serial/UART text out-of-order

Mon Aug 19, 2019 8:50 pm

Are you able to run sudo rpi-update on Kali?

That will get you 4.19.66 which will include the UART clock rate fixes.
kali doesn't ship with rpi-update, but having the kernel version number with the fix is enough to help the kali maintainers pull the correct updates from upstream. Thanks a lot for your help!

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