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

[Peter Seiderer <ps.report@gmx.net>]

Hello Luke, Yann,

On Mon, 20 Mar 2017 22:02:41 +0100, "Yann E. MORIN" <yann.morin.1998@free.fr> wrote:

> Luke, All,
> 
> On 2017-03-20 12:41 +0000, luke spake thusly:
> > Sorry, made a mistake in the original patch.
> > 
> > 
> > >From 9c77dfd825bebbf02e3b2837dacb9ae4873c9ec8 Mon Sep 17 00:00:00 2001
> > From: Luke <skywal_l@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
> 
> Please send you patches using 'git send-email'. Your current submissions
> are not appropriately formatted.
> 
> > Signed-off-by: Luke <skywal_l@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 >> ${TARGET_DIR}/../images/rpi-firmware/config.txt
> 
> Two things about this one:
> 
>   - what you wanted to use was $(BINARIES_DIR)/rpi-firmware/config.txt,
> 
>   - as I already replied to you earlier, please look at how it is
>     done for the rpi3, and try to see if the same trick applies to
>     the rpi0-w.
> 

In case the rpi3 fix works for rpi0-w take a look at this
patch:

	https://patchwork.ozlabs.org/patch/741230/

adding a new config/raspberrypi0w_defconfig, same as for rpi0 adding
additional 'dtoverlay=pi3-miniuart-bt' (and adding the overlay directory
to the sdcard image)...

Regards,
Peter


> Thanks!
> 
> Regards,
> Yann E. MORIN.
> 
> > -- 
> > 2.7.4
> > 
> > 
> > De : Yann E. MORIN <yann.morin.1998@gmail.com> de la part de Yann E. MORIN <yann.morin.1998@free.fr>
> > Envoy? : dimanche 19 mars 2017 13:27
> > ? : 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@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@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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> > 
> > 
> > start [BZH_lan]
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