/dev/ttyu0 is for mainboard UART
/dev/ttyU0 is for USB UART adapter
Only root has read-write permission for these devices. User account gets access denied.
I can do a root account loopback test (join pins 2 and 3 of the DB9 connector) so that whatever is typed is sent on TX and received on the RX pin using Minicom or Picocom.
If I do "chmod g+rw /dev/ttyu0" it works for the user account.
Chmod of the permission bits is a temporary test. It goes back to default after reboot or unplug of the USB adapter.
You did not state what you consider to be a bug yet you opened a bug report.
If you are new to this kind of system configuration please seek help on forums (or even internet search).
I selected Problem Report Database which happens to use Bugzilla. So I was reporting a problem. Ideally, some FreeBSD expert would evaluate the problem and decide if it is literal bug or a user issue. He/She would ask users for more details and filter a clean workflow for developers.
My tests shows that the hardware works but the system does not enable it for users in the wheel group as the design intended.
I don't know how to enable it without compromising security.
(In reply to RMM1 from comment #4)
> Ideally, some FreeBSD expert would evaluate the problem and decide if it is literal bug or a user issue.
And that's what happened.
There is no promise that group wheel has access to that type of hardware, so there is no bug.
If you have a question about how to configure FreeBSD to suite your needs, please ask it on forums.
It's rather not a bug, please take a look at devfs.conf(5) nam page and change /etc/devfs.conf to fulfill your needs.