Hi, i’m trying to use a Quectel RM520N-GL modem via PCIe on an Embedded Linux System (Kernel 6.1.70) in connection with ModemManager (1.22.0). I tried with the following kernel config:
CONFIG_MHI_BUS=y CONFIG_MHI_BUS_PCI_GENERIC=y CONFIG_MHI_NET=y which seems to create a correct data channel (interface mhi_hwip0). Also those devices are created: dl-router-00002[TEST-CR-1]:~# ls /sys/bus/mhi/devices/ mhi0 mhi0_DIAG mhi0_IPCR mhi0_IP_HW0 mhi0_MBIM mhi0_QMI However it wouldn’t create a suitable control channel: Aug 04 19:10:55 dl-router-00002 ModemManager[1231]: [1754327455.502771] [plugin-manager] task 3: still 1 running probes (0 active): mhi_hwip0 Aug 04 19:10:55 dl-router-00002 ModemManager[1231]: [1754327455.502828] [plugin-manager] task 3: no active tasks to probe Aug 04 19:10:55 dl-router-00002 ModemManager[1231]: [1754327455.502879] [plugin-manager] task 3,mhi_hwip0: deferred task completed, no suggested plugin Aug 04 19:10:55 dl-router-00002 ModemManager[1231]: [1754327455.502935] [plugin-manager] task 3,mhi_hwip0: finished in '4.009758' seconds Aug 04 19:10:55 dl-router-00002 ModemManager[1231]: [1754327455.503017] [plugin-manager] task 3,mhi_hwip0: not supported by any plugin Aug 04 19:10:55 dl-router-00002 ModemManager[1231]: [1754327455.503091] [device /sys/devices/platform/bus@5f000000/5f010000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/0000:02:05.0/0000:cb:00.0] fully ignoring port mhi_hwip0 from now on I then tried adding CONFIG_QRTR=y CONFIG_QRTR_MHI=y Now it seems that the ModemManager can talk to the modem via QMI : Aug 01 20:24:06 dl-router-00002 ModemManager[10468]: [1754072646.499104] [base-manager] port qrtr3 is first in device qcom-soc Aug 01 20:24:06 dl-router-00002 ModemManager[10468]: [1754072646.499654] [plugin-manager] task 0: new support task for device: qcom-soc Aug 01 20:24:06 dl-router-00002 ModemManager[10468]: [1754072646.499899] [qrtr3/probe] port type hint detected in udev tag: ID_MM_PORT_TYPE_QMI Aug 01 20:24:06 dl-router-00002 ModemManager[10468]: [1754072646.499986] [qrtr3/probe] port type hints loaded: AT no, QMI yes, MBIM no, QCDM no, AUDIO no, GPS no But the ModemManager fails to recognize the mhi_hwip0 interface as the related data channel. Does anyone know how get this to work? Many Thanks, Joe --- Johann Hagler Software Engineer Mission Embedded GmbH Gutheil-Schoder-Gasse 8-12 1100 Vienna, Austria M +43-660-8833-958 F +43-1-997993-200 E j...@mission-embedded.com<mailto:j...@mission-embedded.com> W www.mission-embedded.com<http://www.mission-embedded.com/> [cid:ee3840f9-bdae-43e5-98d5-d58c4b44bffe] Vienna Commercial Court Reg. Nr.: FN 410566 z, VAT ID: ATU 68709007
