Date: Mon, 9 Jan 2023 13:43:37 -0700 From: John Rushford <jjrushford@gmail.com> To: "freebsd-arm@freebsd.org" <freebsd-arm@FreeBSD.org> Subject: Pi 4 serial ports Message-ID: <C9D9F0D3-7D0A-47DA-9077-433651ECB86E@gmail.com>
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Greetings, 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. 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? Thanks John=
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