At EuroBSDcon 2026:
Linux emulation on NetBSD: How broken is it? https://events.eurobsdcon.org/2026/talk/WXCFYU/
Talk by Stephen Borrill
2026-09-12 13:00:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
@eurobsdcon #eurobsdcon #freebsd #netbsd #openbsd #conference #brussels #bruxelles #freesoftware #libresoftware

At EuroBSDcon 2026:
Porting STUNMESH-go to FreeBSD and macOS: Building Peer-to-Peer WireGuard Networks https://events.eurobsdcon.org/2026/talk/WHGJBN/
Talk by Yu-Chiang (Date) Huang
2026-09-12 15:00:00
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About EuroBSDcon 2026: https://2026.eurobsdcon.org
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At EuroBSDcon 2026:
Keeping up with language-based packaging systems in Ports (especially Python) https://events.eurobsdcon.org/2026/talk/VDQ3JL/
Talk by Charlie Li
2026-09-13 16:15:00
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About EuroBSDcon 2026: https://2026.eurobsdcon.org
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At EuroBSDcon 2026:
Supporting hibernate (S4) on FreeBSD https://events.eurobsdcon.org/2026/talk/TXRZP7/
Talk by Olivier Certner
2026-09-13 11:30:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
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At EuroBSDcon 2026:
Reducing the headache of VPNs with routing domains https://events.eurobsdcon.org/2026/talk/TUT8LU/
Talk by Martin Vahlensieck
2026-09-12 14:00:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
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At EuroBSDcon 2026:
BSD as a Foundational Platform for Nationwide Semiconductor Education in Japan https://events.eurobsdcon.org/2026/talk/TDELZJ/
Talk by Hiroki Sato
2026-09-12 16:00:00
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About EuroBSDcon 2026: https://2026.eurobsdcon.org
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At EuroBSDcon 2026:
A Noob Goes OpenBSD https://events.eurobsdcon.org/2026/talk/T3MDAC/
Talk by Kent Inge Fagerland Simonsen
2026-09-12 15:00:00
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About EuroBSDcon 2026: https://2026.eurobsdcon.org
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At EuroBSDcon 2026:
FreeBSD on ARM64: A User's Perspective https://events.eurobsdcon.org/2026/talk/SKHWVL/
Talk by Michael Dexter
2026-09-12 16:00:00
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About EuroBSDcon 2026: https://2026.eurobsdcon.org
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At EuroBSDcon 2026:
Managing FreeBSD jails with Sylve and Ansible https://events.eurobsdcon.org/2026/talk/S3ULVJ/
Tutorial Half Day by Patrick M. Hausen
2026-09-11 10:30:00
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About EuroBSDcon 2026: https://2026.eurobsdcon.org
@eurobsdcon #eurobsdcon #freebsd #netbsd #openbsd #conference #brussels #bruxelles #freesoftware #libresoftware

At EuroBSDcon 2026:
An Introduction to the Filesystems and Networking in the FreeBSD Open-Source Operating System https://events.eurobsdcon.org/2026/talk/RNEMNV/
Tutorial Full Day by Kirk McKusick
2026-09-10 10:30:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
@eurobsdcon #eurobsdcon #freebsd #netbsd #openbsd #conference #brussels #bruxelles #freesoftware #libresoftware

At EuroBSDcon 2026:
Network Management with the PF Packet Filter Toolset on OpenBSD and FreeBSD https://events.eurobsdcon.org/2026/talk/RKCHRW/
Tutorial Full Day by Peter N. M. Hansteen, Massimiliano Stucchi and Tom Smyth
2026-09-11 10:30:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
@eurobsdcon #eurobsdcon #freebsd #netbsd #openbsd #conference #brussels #bruxelles #freesoftware #libresoftware

At EuroBSDcon 2026:
The night before CRAmas - why EU regulations are a gift to open source https://events.eurobsdcon.org/2026/talk/RER8UZ/
Tutorial Full Day by Alice Sowerby, Peter N. M. Hansteen and Pierre Pronchery
2026-09-10 10:30:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
@eurobsdcon #eurobsdcon #freebsd #netbsd #openbsd #conference #brussels #bruxelles #freesoftware #libresoftware

At EuroBSDcon 2026:
Hotplugging adventures in the bhyve hypervisor https://events.eurobsdcon.org/2026/talk/QVRGB9/
Talk by Bojan Novković
2026-09-13 11:30:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
@eurobsdcon #eurobsdcon #freebsd #netbsd #openbsd #conference #brussels #bruxelles #freesoftware #libresoftware

At EuroBSDcon 2026:
rcd(8): modern service manager the FreeBSD way https://events.eurobsdcon.org/2026/talk/QTAQKG/
Talk by bapt
2026-09-12 16:00:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
@eurobsdcon #eurobsdcon #freebsd #netbsd #openbsd #conference #brussels #bruxelles #freesoftware #libresoftware

At EuroBSDcon 2026:
Incident Response done the FreeBSD way https://events.eurobsdcon.org/2026/talk/PBHXXC/
Talk by Maciej Jan Broniarz
2026-09-12 14:00:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
@eurobsdcon #eurobsdcon #freebsd #netbsd #openbsd #conference #brussels #bruxelles #freesoftware #libresoftware

At EuroBSDcon 2026:
GEFS: The File Shredder of the Future. https://events.eurobsdcon.org/2026/talk/NVMSCJ/
Talk by Ori Bernstein
2026-09-13 11:30:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
@eurobsdcon #eurobsdcon #freebsd #netbsd #openbsd #conference #brussels #bruxelles #freesoftware #libresoftware

At EuroBSDcon 2026:
Introduction to TUI Programming with bsddialog https://events.eurobsdcon.org/2026/talk/MGL8PR/
Tutorial Half Day by Benedict Reuschling
2026-09-11 14:30:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
@eurobsdcon #eurobsdcon #freebsd #netbsd #openbsd #conference #brussels #bruxelles #freesoftware #libresoftware

At EuroBSDcon 2026:
Unix Manpages, Then and Now https://events.eurobsdcon.org/2026/talk/MDEE9H/
Talk by Kristaps Dzonsons
2026-09-12 17:00:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
@eurobsdcon #eurobsdcon #freebsd #netbsd #openbsd #conference #brussels #bruxelles #freesoftware #libresoftware

At EuroBSDcon 2026:
Base system packages in Production: A Practical Overview https://events.eurobsdcon.org/2026/talk/MBEDBM/
Talk by Lukas Engelhardt
2026-09-12 15:00:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
@eurobsdcon #eurobsdcon #freebsd #netbsd #openbsd #conference #brussels #bruxelles #freesoftware #libresoftware

At EuroBSDcon 2026:
OpenNTPD - 20 years and a few milliseconds later https://events.eurobsdcon.org/2026/talk/MAHMBQ/
Talk by Henning Brauer
2026-09-13 16:15:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
@eurobsdcon #eurobsdcon #freebsd #netbsd #openbsd #conference #brussels #bruxelles #freesoftware #libresoftware

At EuroBSDcon 2026:
nuageinit(7): make FreeBSD cloud native https://events.eurobsdcon.org/2026/talk/LZUXZ8/
Talk by bapt
2026-09-12 17:00:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
@eurobsdcon #eurobsdcon #freebsd #netbsd #openbsd #conference #brussels #bruxelles #freesoftware #libresoftware

At EuroBSDcon 2026:
How Fast Can We Patch? https://events.eurobsdcon.org/2026/talk/LSR7EX/
Talk by Dave Cottlehuber (dch)
2026-09-13 14:15:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
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At EuroBSDcon 2026:
FreeBSD Ports Any% Speedrun 180min https://events.eurobsdcon.org/2026/talk/KHHBZE/
Tutorial Half Day by Mateusz Piotrowski
2026-09-11 14:30:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
@eurobsdcon #eurobsdcon #freebsd #netbsd #openbsd #conference #brussels #bruxelles #freesoftware #libresoftware

At EuroBSDcon 2026:
The night 142 of my servers went up in the clouds. Physically. https://events.eurobsdcon.org/2026/talk/KAEQA8/
Talk by Stefano Marinelli
2026-09-12 11:15:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
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At EuroBSDcon 2026:
Looney Tunes: FreeBSD, rsync, and ZFS https://events.eurobsdcon.org/2026/talk/JURFDY/
Talk by Mateusz Piotrowski
2026-09-13 17:15:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
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At EuroBSDcon 2026:
The current state of "Green AI" https://events.eurobsdcon.org/2026/talk/JP73CG/
Talk by Anne Currie
2026-09-13 09:30:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
@eurobsdcon #eurobsdcon #freebsd #netbsd #openbsd #conference #brussels #bruxelles #freesoftware #libresoftware

At EuroBSDcon 2026:
Introduction to the Game of Trees version control system https://events.eurobsdcon.org/2026/talk/JJLZXQ/
Tutorial Half Day by Stefan Sperling and Omar Polo
2026-09-10 10:30:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
@eurobsdcon #eurobsdcon #freebsd #netbsd #openbsd #conference #brussels #bruxelles #freesoftware #libresoftware

At EuroBSDcon 2026:
Running BSD workloads in Linux environments as OCI containers https://events.eurobsdcon.org/2026/talk/JHXWDC/
Talk by Charalampos Mainas
2026-09-12 17:00:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
@eurobsdcon #eurobsdcon #freebsd #netbsd #openbsd #conference #brussels #bruxelles #freesoftware #libresoftware

At EuroBSDcon 2026:
Confidential VMs on FreeBSD: A Complete AMD SEV Host Stack for bhyve, with Attestation https://events.eurobsdcon.org/2026/talk/HSMCFS/
Talk by Zhen-Rong Wu
2026-09-13 10:30:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
@eurobsdcon #eurobsdcon #freebsd #netbsd #openbsd #conference #brussels #bruxelles #freesoftware #libresoftware

At EuroBSDcon 2026:
The Realities of Enterprise FreeBSD https://events.eurobsdcon.org/2026/talk/HRXAHF/
Talk by Allan Jude
2026-09-12 11:15:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
@eurobsdcon #eurobsdcon #freebsd #netbsd #openbsd #conference #brussels #bruxelles #freesoftware #libresoftware

At EuroBSDcon 2026:
Advances in OpenBSD's pkg_add https://events.eurobsdcon.org/2026/talk/HFYB3N/
Talk by Marc Espie
2026-09-13 14:15:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
@eurobsdcon #eurobsdcon #freebsd #netbsd #openbsd #conference #brussels #bruxelles #freesoftware #libresoftware

At EuroBSDcon 2026:
Getting Extended Error Messages from the FreeBSD Kernel https://events.eurobsdcon.org/2026/talk/HA8JTA/
Talk by Kirk McKusick
2026-09-13 16:15:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
@eurobsdcon #eurobsdcon #freebsd #netbsd #openbsd #conference #brussels #bruxelles #freesoftware #libresoftware

At EuroBSDcon 2026:
I/O and theorems and barriers, oh my https://events.eurobsdcon.org/2026/talk/FQJSPU/
Talk by Taylor R Campbell
2026-09-12 14:00:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
@eurobsdcon #eurobsdcon #freebsd #netbsd #openbsd #conference #brussels #bruxelles #freesoftware #libresoftware

At EuroBSDcon 2026:
Low friction temporary VMs on FreeBSD https://events.eurobsdcon.org/2026/talk/FMAKRV/
Talk by Martin Vahlensieck
2026-09-13 17:15:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
@eurobsdcon #eurobsdcon #freebsd #netbsd #openbsd #conference #brussels #bruxelles #freesoftware #libresoftware

At EuroBSDcon 2026:
An Introduction to the Kernel Services and I/O System of the FreeBSD Open-Source Operating System https://events.eurobsdcon.org/2026/talk/EYQSJR/
Tutorial Full Day by Kirk McKusick
2026-09-11 10:30:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
@eurobsdcon #eurobsdcon #freebsd #netbsd #openbsd #conference #brussels #bruxelles #freesoftware #libresoftware

At EuroBSDcon 2026:
ELKE - Encrypted & Lovely Kage Environment, using FreeBSD https://events.eurobsdcon.org/2026/talk/EXHKSR/
Talk by Vinícius Z.
2026-09-13 15:15:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
@eurobsdcon #eurobsdcon #freebsd #netbsd #openbsd #conference #brussels #bruxelles #freesoftware #libresoftware

At EuroBSDcon 2026:
make buildworld && make install-future: Why FreeBSD's Adoption Story Runs Through Continuous Integration https://events.eurobsdcon.org/2026/talk/EA98CK/
Talk by Moin Rahman
2026-09-13 10:30:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
@eurobsdcon #eurobsdcon #freebsd #netbsd #openbsd #conference #brussels #bruxelles #freesoftware #libresoftware

At EuroBSDcon 2026:
Highly Available DNS via BGP
Talk by Beni Keller
2026-09-12 10:30:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
@eurobsdcon #eurobsdcon #freebsd #netbsd #openbsd #conference #brussels #bruxelles #freesoftware #libresoftware

At EuroBSDcon 2026:
PFWall: building firewall images to run at scale https://events.eurobsdcon.org/2026/talk/DZ9GE3/
Talk by Pierre Emeriaud
2026-09-13 17:15:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
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At EuroBSDcon 2026:
Run Time Reoptimization for Modern Heterogenous Systems https://events.eurobsdcon.org/2026/talk/CPAE7W/
Talk by George Neville-Neil
2026-09-12 13:00:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
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At EuroBSDcon 2026:
FreeBSD in Bioinformatics: The Good, The Bad and The Ugly https://events.eurobsdcon.org/2026/talk/CEZMMY/
Talk by Varinka Ohanyan
2026-09-13 15:15:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
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At EuroBSDcon 2026:
Bringing memory safety to BSD with CHERI https://events.eurobsdcon.org/2026/talk/AU3F7S/
Talk by Brooks Davis
2026-09-13 14:15:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
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At EuroBSDcon 2026:
What has (can) the EU Cyber Resilience Act done (do) for you? https://events.eurobsdcon.org/2026/talk/9NVQAD/
Talk by Peter N. M. Hansteen
2026-09-12 10:30:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
@eurobsdcon #eurobsdcon #freebsd #netbsd #openbsd #conference #brussels #bruxelles #freesoftware #libresoftware

At EuroBSDcon 2026:
Hands On experience Chaos Education: Challenge your FreeBSD sysadmin skills by solving real world scenarios https://events.eurobsdcon.org/2026/talk/7KWLK9/
Tutorial Half Day by Andreas Kirchner 2026-09-11 10:30:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
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At EuroBSDcon 2026:
Running stock FreeBSD on Windows Subsystem for Linux 2 https://events.eurobsdcon.org/2026/talk/39G3BV/
Talk by Balaje Sankar 2026-09-12 11:15:00
To register: https://tickets.eurobsdcon.org/eurobsdcon/brussels/
About EuroBSDcon 2026: https://2026.eurobsdcon.org
@eurobsdcon #eurobsdcon #freebsd #netbsd #openbsd #conference #brussels #bruxelles #freesoftware #libresoftware

Whilst researching this, I had a look at some of the libraries out there to see how they do it on different operating systems.

Microsoft Windows and Apple MacOS X provide system APIs for doing this.
On Linux, some libraries go poking around in `/dev/serial/*`, others go nosing through `/sys/class/tty/*`. Some just look for specific names in `/dev` and hope for the best. `pyserial` also checks `/proc/tty/drivers` on Linux, but everywhere else in POSIX land it uses `glob`.

Most do not consider BSD at all. You're on your own to learn what serial ports your computer has. It's a mess.

#NetBSD has a `/kern` virtual filesystem which is similar to `/sys` in Linux… so there *is* scope there to maybe put some sort of virtual text file that dumps a mapping of devices and what device nodes they're at. My mind also thinks about OpenFirmware's DeviceTree.

BSD in general, has the same problem Linux had years ago: it assumed the hardware never changed. In the 80s and 90s, that was mostly true, your devices were hard-wired into "busses". You mostly ignored that there was a ISA bus, you just "knew" you had a device at address 0x300 and "talked" to it. It was there at power on, and there at shutdown.

SCSI was a little more complicated, you spoke to your disk drive *through* this HBA card.

Then came along Firewire, USB and Bluetooth. Devices could come and go as they pleased. Moreover, USB is a tree structure and Bluetooth is a mesh radio network. A flat structure doesn't quite describe the situation. I'm seeing a lot of wisdom behind the idea of Open Firmware's DeviceTree… and it seems to me, the kernel of a modern OS needs to track a live changing representation of this. A big part of keeping track will be providing a mechanism for the userspace to learn of changes in this tree, and to find where things are.

While I don't expect them to wholesale copy Linux, I think there is merit in the kernel calling a userspace application to "set up" devices when they are detected, and "tear down" those devices when they are removed.

This is `udev` in Linux and it is very handy even if it can be a pain in the bum to debug.

I've also seen the virtual `/dev` filesystem route used. Linux used to have `devfs`, and SyllableOS also used such a system. Not saying that's the best approach, but it is another way of exposing this information to the system.

Not sure which is the "right" approach, but I don't think a static "nothing ever changes" approach is viable here.

Playing around with #NetBSD again… so I have a Intel NUC running it. One of the thing I frequently have to deal with, being an embedded software developer *and* an amateur radio operator, is #SerialPorts.

More often than not, USB serial ports. Now, I'm used to the Linux way of doing things, where everything is accessed through a /dev/tty* device.

We used to do it the BSD way with a device like /dev/cua0 (16550 UART on ISA 0x3f8 IRQ 4; COM1 for you DOS people) being your serial port ignoring carrier detect, and /dev/ttyS0 was the same serial port but required CD to be up. This got deprecated years ago, so /dev/cua0 disappeared, and we were left with /dev/ttyS0.

I grabbed a test rig I made for work, this is Zephyr RTOS on a Raspberry Pi Pico. It enumerates two CDC-ACM serial ports, one with the Zephyr shell, and the other is a USB serial port. You use the shell port to tell it how to route the RXD/TXD lines on the other serial port, with the board supporting RS-485, RS-422 and TTL serial. On Linux, it shows up as `/dev/ttyACM${n}` and `/dev/ttyACM$(( ${n} + 1 )`. `udev` also creates these symbolic links:

```
stuartl@rikishi ~ $ ls -l /dev/serial/by-id
total 0
lrwxrwxrwx 1 root root 13 Jul 26 10:58 usb-WideSky.Cloud_Pty_Ltd_WideSky_Hub_Test_Rig_E663AC91D3665F30-if00 -> ../../ttyACM0
lrwxrwxrwx 1 root root 13 Jul 26 10:58 usb-WideSky.Cloud_Pty_Ltd_WideSky_Hub_Test_Rig_E663AC91D3665F30-if02 -> ../../ttyACM1
stuartl@rikishi ~ $ ls -l /dev/serial/by-path/
total 0
lrwxrwxrwx 1 root root 13 Jul 26 10:58 pci-0000:00:14.0-usb-0:2:1.0 -> ../../ttyACM0
lrwxrwxrwx 1 root root 13 Jul 26 10:58 pci-0000:00:14.0-usb-0:2:1.2 -> ../../ttyACM1
lrwxrwxrwx 1 root root 13 Jul 26 10:58 pci-0000:00:14.0-usbv2-0:2:1.0 -> ../../ttyACM0
lrwxrwxrwx 1 root root 13 Jul 26 10:58 pci-0000:00:14.0-usbv2-0:2:1.2 -> ../../ttyACM1
```

This is handy because if I have two of these, it doesn't matter which gets detected first, I know which device is which. The links ending in `-if02` or `.2` will be the data port, and the `-if00` / `.0` ones will be the shell control port.

In NetBSD, I plug this same MCU in and I get 4 devices:
- `/dev/dtyU0`
- `/dev/dtyU1`
- `/dev/ttyU0`
- `/dev/ttyU1`

The files actually always exist, but they get mapped to this physical device when the driver detects it and enumerates it on USB.

If I plug in another dongle, I get another pair, a `/dev/dtyU2` and a `/dev/ttyU2`. The choice of `/dev/dtyU[012]` is dependent on which order the devices is detected… which on USB is indeterminate as they can be hotplugged.

The only clue I get is the `usbdevs -v`; it shows a device number and serial number information.

```
vk4msl-nbsd# usbdevs -v
Controller /dev/usb0:
addr 0: super speed, self powered, config 1, xHCI root hub(0x0000), NetBSD(0x0000), rev 1.00(0x0100)
port 1 disabled
port 2 disabled
port 3 disabled
port 4 disabled
Controller /dev/usb1:
addr 0: high speed, self powered, config 1, xHCI root hub(0x0000), NetBSD(0x0000), rev 1.00(0x0100)
port 1 powered
port 2 addr 17: full speed, power 100 mA, config 1, USB-Serial Controller D(0x2303), Prolific Technology Inc.(0x067b), rev 4.00(0x0400)
port 3 addr 1: low speed, power 100 mA, config 1, CASUE USB KB(0x6a21), vendor 2a7a(0x2a7a), rev 0.01(0x0001)
port 4 addr 18: full speed, self powered, config 1, WideSky Hub Test Rig(0x5678), WideSky.Cloud Pty Ltd(0x1234), rev 4.03(0x0403), serial E663AC91D3665F30
port 5 powered
port 6 powered
port 7 addr 3: full speed, self powered, config 1, product 0a2a(0x0a2a), Intel(0x8087), rev 0.01(0x0001)
port 8 powered
port 9 powered
port 10 powered
port 11 powered
…
```

lacking is the knowledge that there are *two* devices allocated to device 18 (the test rig).

Given a `/dev/ttyU${n}` or `/dev/dtyU${n}` device node, how do I find out about the device attached to it? Seems assuming a device node is fraught with danger.

Some binary packages missing for #NetBSD #pkgsrc ... but i suspect it is a work in progress.
https://github.com/NetBSD/pkgsrc/issues/182

In case any of you has missed it RC 7 of NetBSD 11 is out

https://bsdsec.net/articles/netbsd-11-0-rc7-available

#netbsd #netbsd11

https://netbsd-cells.petermann-digital.de/ #NetBSD #jails #containers #virtualization