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Date:      Mon, 9 Jan 2023 20:54:38 -0700
From:      John Rushford <jjrushford@gmail.com>
To:        "freebsd-arm@freebsd.org" <freebsd-arm@FreeBSD.org>
Subject:   Re: Pi 4 serial ports
Message-ID:  <3225E237-1F0E-4FA2-92C0-D683B8114F64@gmail.com>
In-Reply-To: <C9D9F0D3-7D0A-47DA-9077-433651ECB86E@gmail.com>
References:  <C9D9F0D3-7D0A-47DA-9077-433651ECB86E@gmail.com>

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This is all new to me and after some digging, I=E2=80=99m currently =
trying to put together a rk3328-uart2.dtso that I can compile to an =
overlay file so as to enable uart2

John

> On Jan 9, 2023, at 1:43 PM, John Rushford <jjrushford@gmail.com> =
wrote:
>=20
> Greetings,
>=20
> I=E2=80=99m running FreeBSD 13.1-RELEASE on a raspberry pi 4b rev 1.4. =
 The pi 4 has 4 UART ports available but as far as I can tell, FreeBSD =
13.1 only supports 1 of them.
> I would like to use one of the other UART ports to wire an adafruit =
GPS breakout too.  I tried using the UART0 port but when I wire the GPS =
breakout to it,=20
> I run into boot issues with u-boot and console logging.  I know that =
in other OS=E2=80=99s such as raspian or ubuntu, you are able to enable =
the additional UARTS in config.txt.
> Thinking that FreeBSD might support this I tried adding =
=E2=80=9Cdtoverlay=3Duartx=E2=80=9D where x is 0 to 3 but I=E2=80=99m =
not seeing in any kernel logging that these ports were enabled and
> I don=E2=80=99t see any additional ttyu=E2=80=99s in the dev tree.
>=20
> So my question, does FreeBSD support these additional UARTS and if so, =
how do I enable them so that I may use one for the GPS breakout?
>=20
> Thanks
> John




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