Orange Pi 5 Plus - serial port not working in FreeBSD14 and 13.2

[rdunkle34]

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Using: v0.9.1-19-gcc77cee8
when I boot efi the serial ports works. The speed can be changed from the efi firmware. The terminal works OK up to the point where the system checks the processors. I see this on console during boot:
Setting currdev to disk0p2:
Loading /boot/defaults/loader.conf
Loading /boot/defaults/loader.conf
Loading /boot/device.hints
Loading /boot/loader.conf
console comconsole failed to initialize
The processors are identified and then serial output stops.
Output looks like this:
output to serial always stops here--> I/TC: Secondary CPU 7 switching to normal world boot.
Speed can be set to 150000 or 115200 in efi. the same results.
dmesg | grep uart
uart0: iomem 0xfeb50000-0xfeb50fff irq 21 on acpi0
On FreeBSD normally the next line of the dmesg output will show that the uart0 is then configured.
It normally looks like this:
uart0: console (115200,n,8,1)
I believe there is something missing in the DTB for the serial port on the Orange Pi 5 Plus.

[mariobalanica]

FreeBSD is hardcoding a 200 MHz ref clock here: https://github.com/freebsd/freebsd-src/blob/main/sys/dev/uart/uart_dev_ns8250.c#L461, while on this platform the clock is running at 24 MHz.

So it does not look like a firmware issue. The UART console works fine in NetBSD, although it's being reconfigured at 115200 baud.

I believe there is something missing in the DTB for the serial port on the Orange Pi 5 Plus.

DTB is only usable for Rockchip Linux. For anything else ACPI should be used, and it's the default choice.