PCIe Connector_ I2C line

Mehrdad · January 20, 2023, 3:17pm

Dear Support,

I tried to connect a modem and a SIM card to an imx8 mini in our PCB and after enabling the modem I received the following error message:

error: couldn’t enable the modem: ‘GDBus.Error:org.freedesktop.ModemManager1.Error.Core.Failed: Cannot power-up: hardware radio switch is OFF’

Mostly the schematic is the same except for the I2C line. verdin board is used I2C_1 and we used I2C_2
Before modification on the Device tree, I wondered if the issues were related. and do I need to modify that?

Verdin Schematic

our Schematic

Thank you so much for your time.
Best regards,
Mehrdad

jeremias.tx · January 20, 2023, 7:50pm

Greetings @Mehrdad,

What modem model are you using here? That error message could also be indicative of a software related issue. Perhaps your modem needs special drivers or firmware to be initialized.

Best Regards,
Jeremias

Mehrdad · January 21, 2023, 9:31pm

Hi @jeremias.tx ,
Thank you so much for replying,
Simcom 7760 was used, and it worked on the verdin board, I followed the same instructions, but it did not work on our PCB.
Best regards,
Mehrdad

andrejs.tx · January 23, 2023, 8:41am

Hi @Mehrdad,

This might be the software issue. Have you played around with rfkill?

Best regards,
Andrejs Cainikovs.

Mehrdad · January 31, 2023, 12:54pm

Hi @andrejs.tx ,

I did not use rfkill and for the first time, I see that.
we used the I2C_2 instead of I2C_1 for our PCB and I didn’t use any code, just Linux syntax to unlock the sim card and enable the modem.