Hello Genodians
In the Release notes, I read that on the Pinephone it is possible to use the Quectel EG25-G in ECM mode to communicate over LTE. Which I find is a really great feature.
We have a hardware (UP-Xtreme i7 8th gen) which comes with the same modem. I really like the idea of using the modem in this way.
As far as I understand, the run script `run/modem_pinephone.run` of the `genode-allwinner` repository does exactly that.
My plan is to create a PC version of `pinephone_modem` that controls the modem. Do you think, this is possible?
Currently I do not have a idea what serial port I should use to connect to the command channel of the modem. On the Pinephone, `ns16550_uart` is used to do that.
Which serial port should be used on the PC platform?
Regards, Pirmin
Hello Pirmin,
On 9/1/22 15:23, Duss Pirmin wrote:
Hello Genodians
In the Release notes, I read that on the Pinephone it is possible to use the Quectel EG25-G in ECM mode to communicate over LTE. Which I find is a really great feature.
We have a hardware (UP-Xtreme i7 8th gen) which comes with the same modem. I really like the idea of using the modem in this way.
As far as I understand, the run script `run/modem_pinephone.run` of the `genode-allwinner` repository does exactly that.
My plan is to create a PC version of `pinephone_modem` that controls the modem. Do you think, this is possible?
It should be possible in general since communication with the modem only uses AT commands.
Currently I do not have a idea what serial port I should use to connect to the command channel of the modem. On the Pinephone, `ns16550_uart` is used to do that.
Which serial port should be used on the PC platform?
I think on the PC the modem will expose USB-Serial ports (ttyUSB<x> and friends). You can try this by connection via a terminal emulator (e.g., picocom, minicom) to it:
! picocom -b 115200 /dev/ttyUSB2
Enter: ! AT
Return: ! OK
If the "AT" command gives you an "OK", you found the correct device. Note the modem exposes four UARTs. If this all is the case, a USB serial driver that exposes a terminal session (like PL2303 [1]) is needed on Genode. I don't know exactly what kind of USB UART adapter the modem exposes right now. Maybe it's already PL2303. I will check.
[1] repos/dde_linux/src/server/usb_terminal
Cheers,
Sebastian
Genode users mailing list users@lists.genode.org https://lists.genode.org/listinfo/users
Hi Sebastian
Thanks for you quick reply.
On 01.09.22 16:57, Sebastian Sumpf wrote:
If the "AT" command gives you an "OK", you found the correct device. Note the modem exposes four UARTs. If this all is the case, a USB serial driver that exposes a terminal session (like PL2303 [1]) is needed on Genode. I don't know exactly what kind of USB UART adapter the modem exposes right now. Maybe it's already PL2303. I will check.
Booting Ubuntu on the device (/dev/ttyUSB2) to be driven by the option serial driver (drivers/usb/serial/option.c). I did not check, which other files are required to create a working driver thou.
I will try to expand `usb_terminal` to support both types of serial ports.
Regards, Pirmin
Hi Pirmin,
On 9/2/22 10:59, Duss Pirmin wrote:
Hi Sebastian
Thanks for you quick reply.
On 01.09.22 16:57, Sebastian Sumpf wrote:
If the "AT" command gives you an "OK", you found the correct device. Note the modem exposes four UARTs. If this all is the case, a USB serial driver that exposes a terminal session (like PL2303 [1]) is needed on Genode. I don't know exactly what kind of USB UART adapter the modem exposes right now. Maybe it's already PL2303. I will check.
Booting Ubuntu on the device (/dev/ttyUSB2) to be driven by the option serial driver (drivers/usb/serial/option.c). I did not check, which other files are required to create a working driver thou.
I will try to expand `usb_terminal` to support both types of serial ports.
On second thought: The 'usb_terminal' is a server. What you would need is a terminal client that writes received data from the UART to the terminal session and that writes received data from the terminal session to the UART. You can take 'ns16550' in the allwinner repo as a reference (main.cc).
As an afterthought: In case you need data connectivity only, you could try setting the modem into MBIM mode, since we have MBIM support in Genode's 'world' repo [1] and the USB-modem driver for that is already in place [2]:
The AT command to change the mode to MBIM is
! AT+QCFG="usbnet",2
and reboot the modem via
! AT+CFUN=1,1
in order to activate the change, which is permanent until you change the mode to something else.
Next you could try out the ''mbimcli.run' [3] script adjusting the following line to the correct values from your provider:
! <network apn="internet.eplus.de" user="eplus" password="eplus" pin="XXXX"/>
*pin is the pin of your SIM card
If you are lucky this might work out of the box, but it is uncharted territory so far ;) We have only tested this with Huawei's ME906s and Fibocom's L830-EB-00. It would be interesting if this works because MBIM is a generic protocol that should work with all MBIM supporting modems.
Cheers and let me know about the outcome,
Sebastian
[1] https://github.com/genodelabs/genode-world/tree/master/src/app/mbimcli [2] https://github.com/genodelabs/genode/tree/master/repos/dde_linux/src/drivers...
[3] https://github.com/genodelabs/genode-world/blob/master/run/mbimcli.run
-
Duss Pirmin -
Sebastian Sumpf