Hi, I’m using a Sierra EM9191(sdx55) with PCIe on a raspberry CM4. Until now I had a firmware based on openWRT21.02, for which Aleksander had tuned the MM1.18.2 and few drivers. It worked nicely but we bought a new lot of CM4 and I need to upgrade few files for it to boot (start4.elf and fixup.dat). Upgrading the gpu-firmware package of the bcm2711 did the trick but it seems to have a side effect because the modem can’t connect properly anymore. For every new attempt (through luci) it attach, register and fail to connect, leaving the modem in a disabled state.
My first move was to try the ‘official’ new openwrt, with latest update and better support to my hardware. I had the same result with openwrt 23.05/MM1.20.6 and openwrt master/MM1.22 If I delete my interface in luci, then recreate it, sometimes it connects but there is no downlink traffic. When I try manually to establish the connection, I have this return: # mmcli -m 0 -e successfully enabled the modem. # mmcli -m 0 --simple-connect="apn=" error: couldn't connect the modem: 'GDBus.Error:org.freedesktop.ModemManager1.Error.Core.Unsupported: Cannot disable multiplex support' I managed to make the MHI driver handle the modem but I’m struggling with MM, anyone has a clue of what’s going on? If you need more information or trace, just let me know. Best regards, Vincent
