[Buildroot] [PATCH] Enable UART on raspberry pi zero

luke skywal_l at hotmail.com
Mon Mar 20 12:36:21 UTC 2017


Maybe my message wasn't clear.

This is for the raspberry PI Zero W.

The UART is taken over by the wifi chip, so the software UART is now used for the TX/RX GPIO pin. But to be reliable, the CPU freq is supposed to be limited in some way.

It's all here: https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=141195

Pi3 UART stopped working? Read this. - Raspberry Pi<https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=141195>
www.raspberrypi.org
I have followed this post and others related to the issue and am still stumped by the serial corruption issue. I have a pi 3 flashed with 2016-03-18-raspbian-jessie.




JD


________________________________
De : Yann E. MORIN <yann.morin.1998 at gmail.com> de la part de Yann E. MORIN <yann.morin.1998 at free.fr>
Envoyé : dimanche 19 mars 2017 13:27
À : luke
Cc : buildroot at busybox.net
Objet : Re: [Buildroot] [PATCH] Enable UART on raspberry pi zero

Luke, All,

On 2017-03-18 18:22 +0000, luke spake thusly:
> From 9c77dfd825bebbf02e3b2837dacb9ae4873c9ec8 Mon Sep 17 00:00:00 2001
> From: Luke <skywal_l at hotmail.com>
> Date: Sat, 18 Mar 2017 18:17:24 +0000
> Subject: [PATCH 1/1] Modify post-build.sh for raspberry pi zero so that it
>  activates the UART serial console in config.txt
>
> Signed-off-by: Luke <skywal_l at hotmail.com>
> ---
>  board/raspberrypi/post-build.sh | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/board/raspberrypi/post-build.sh b/board/raspberrypi/post-build.sh
> index 5e5eb71..6d2f0d1 100755
> --- a/board/raspberrypi/post-build.sh
> +++ b/board/raspberrypi/post-build.sh
> @@ -9,3 +9,6 @@ if [ -e ${TARGET_DIR}/etc/inittab ]; then
>        sed -i '/GENERIC_SERIAL/a\
>  tty1::respawn:/sbin/getty -L  tty1 0 vt100 # HDMI console' ${TARGET_DIR}/etc/inittab
>  fi
> +
> +# Activate the console
> +echo "enable_uart=1" | cat >> config.txt

I have a rpi-0 here, and I do not need that config option to get the UART
working.

Regards,
Yann E. MORIN.

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