Re: Pi 4 serial ports

Emmanuel,

Thank you very much!  I’m new to FreeBSD on pi and I guess I was making this way to difficult.
I built the rpi-firmware port and copied/enabled the uart dtb’s for the uart I wish to use.  
I rebooted and I now see the port in the kernel messages and the ttyu in the dev tree.  
Next I’ll break out my soldering iron and wire up the GPS breakout and get it working hopefully.

Cheers
John

> On Jan 10, 2023, at 12:35 AM, Emmanuel Vadot <manu@bidouilliste.com> wrote:
> 
> 
> Hi John,
> 
> On Mon, 9 Jan 2023 13:43:37 -0700
> John Rushford <jjrushford@gmail.com> wrote:
> 
>> Greetings,
>> 
>> I?m 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, 
>> I run into boot issues with u-boot and console logging.  I know that in other OS?s 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 ?dtoverlay=uartx? where x is 0 to 3 but I?m not seeing in any kernel logging that these ports were enabled and
>> I don?t see any additional ttyu?s 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
> 
> In the rpi-firmware package there is some uartXX.dtbo
> By looking at them those overlays are there for enabling the other
> uart port.
> Just put the ones you want to use on the FAT partition of your sdcard
> in the /overlays/ directory and add in config.txt "dtoverlay=uartXXX"
> 
> Cheers,
> 
> -- 
> Emmanuel Vadot <manu@bidouilliste.com> <manu@freebsd.org>