If you add "coherent_pool=4M" to /boot/cmdline.txt, does the issue go away? We've made that the default in our upcoming 4.19 kernel. I gather from the log output that USB communication is failing. That's a known problem if many USB devices are attached and the DMA coherent pool is too smal...

we have also switched from RevPi Core 3+ to a RevPi Connect+. I tried to flash the image from the old to the new controller. For some reason, that did not work directly. I looked around and fount out that the Connect stops with the message "failed to start remount root and kernel file system&q...

We'll introduce a new product real soon now called RevPi Compact which allows attaching a Raspberry Pi Camera.

Alternatively, a regular USB2 camera should do the trick.

/dev/piControl0 existiert nur, wenn auf der Maschine das Kernel-Modul piControl läuft. Wahrscheinlich wurde dein Programm nicht auf dem RevPi, sondern auf deiner lokalen Entwicklungsmaschine ausgeführt. Oder piControl läuft aus irgendeinem Grund nicht, zum Beispiel wenn du es auf deinem RevPi in /et...

That's the supercapacitor powering the RTC. The supercap will sustain the RTC's clock for a couple of hours when the RevPi is not connected to a power supply.

Hallo Dennis, Hallo Nicolai, bitte entschuldigt die verzögerte Antwort. 1) Warum sind die Kernel-Scripte nicht bereits vorkompiliert, wie es beim RevPi der fall ist? (Fehler scripts/basic/fixdep: not found ) Das liegt daran, dass wir den Kernel auf x86 cross-compilieren. Das kbuild System vom Kernel...

Hi porteous, thanks for the suggestion and apologies for the belated reply. The problem is that we cross-compile the kernel on x86. (Compiling on a RevPi would be too slow.) The kernel's build system only builds tools like "fixdep" for the host architecture on which the compiler runs. It d...

I found some first hints. The service is located in "/lib/systemd/system/" It is not restarting upon failure, so I added "Restart=on-failure" to "Service". I guess that makes sense, so I've added it to the service files of both piModbusMaster and piModbusSlave. This ch...

Username "pi", password "raspberry". On first login you'll be prompted to enter the serial number, MAC address and product type. You can skip this step by pressing ^C and you can avoid it on future logins with "touch /home/pi/.revpi-factory-reset". (The mechanism is par...

This will output the initial password which should have been printed on the sticker. If you haven't changed the password, it should allow you to log in. If the output of "piSerial -p" and the password on the sticker do not match then please let us know.