I have upgarde my APU2C4 from factory flashed 4.0.7 to 4.9.0.5 and I noticed that device COM1 has been removed from ACPI namespace.

Just curious what was a reason for that.

Previously the port was auto-configured via ACPI. Now I have to provide configuratons hints for it (on FreeBSD, via device.hints).

Interesting...

I will look into v4.0.7 codebase and check whether it has been removed in the midway to v4.9.0.5.

Thank you!

Andriy

I have implemented the serial ports in ACPI however I see no difference between v4.0.7 or current v4.9.0.5 with serial described in ACPI.

I am using FreeBSD 12.0 RELEASE installer and it just hangs at `Can't find /boot/entropy`

Any guidelines on how can I reproduce the situation where I do not have to configure the port? Would be appreciated.

Hmm, that's bad. I personally didn't have that problem, but my first boot was over the network (PXE) and I used FreeBSD 13.

Are you booting from USB? Maybe try 11.2 instead of 12.0 ...

Regarding the configuration: remove all uart lines from /boot/device.hints and see if any uart devices get detected.

OK I need to set those explicitly either way in loader prompt:

set boot_multicons=YES
set boot_serial=YES
set comconsole_speed=115200
set console=comconsole

and then the kernel log shows:

which I assume is correct. However I suspect this is not the goal we wanted to achieve.

It looks good to me. "on acpi0" means that uart was detected via the ACPI device.

Fine, as long as it suits You.