[yocto] [meta-raspberry] Raspberry Pi 3

[Michael Dumont]

Trevor,

I know with the Pi3 they swapped ttyAMA0 to support Bluetooth.

They put ttyS0 on the 40-pin header, but the clock used for the baud rate
generation on ttyS0 is tied to the core frequency, and it can cause
fluctuations when the core frequency scales up and down.

I believe the official fix is to set core_freq=250 so that the core clock
is always at it's lowest value and never needs to change.  There's also a
dtoverlay that swaps the two UARTs back so you can get the stable UART on
the 40-pin header.

Not clear to me that this is your exact problem, but it might be worth a
quick test?

Some notes here:
https://www.raspberrypi.org/forums/viewtopic.php?f=107&t=138223

Hope this helps,

-Mike

On Fri, Apr 1, 2016 at 9:03 PM, Trevor Woerner <twoerner at gmail.com> wrote:

> On Fri 2016-04-01 @ 03:55:31 PM, Khem Raj wrote:
> >
> > > On Apr 1, 2016, at 3:46 PM, Trevor Woerner <twoerner at gmail.com> wrote:
> > >
> > > On Fri 2016-04-01 @ 03:17:29 PM, Trevor Woerner wrote:
> > >> As far as I can tell there are two raspberry pi OE layers which
> include this
> > >> commit:
> > >>
> > >> 1. git://git.yoctoproject.org/meta-raspberrypi::master
> > >> 2. https://github.com/kraj/meta-raspberrypi.git::kraj/master
> > > [...]
> > >> - Using 1 (the official layer from Andrei) I get an image that boots
> but the
> > >>   console remains messed up (as before).
> > >>
> > >> - Using 2 (the layer from Khem) I get an image that flashes the
> rainbow
> > >>   pattern on the HDMI monitor, shows the 4 berries, then stops.
> Nothing else
> > >>   happens, no messages on the console.
> > >
> > > I get the same results with no local.conf tweaks and building the
> > > rpi-basic-image.
> > >
> > > Does anyone have a run-tested, OE-built, raspi3 image with working
> console?
> > >
> >
> > can you select 4.1 for kernel and try with master, Andre has merged all
> my changes
> > today
>
> Yes, that's one of the options I have already tried; it boots but the
> console
> is still garbled.
>
> The 4.1 kernel is the default in Andrei's layer. Using the 4.4 kernel from
> your layer I can't get past the 4 raspberries.
> --
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