I'm trying to get the subject card to work under OpenBSD 6.2; it works fine under Linux so I know the card itself and its SIM etc are correctly configured and functional.
The card is set to MBIM mode, and I'd like to use the umb driver rather than the umsm driver as not to have to muck with PPP. It seems this card is detected first by the umsm driver though, as I had to disable that driver for the card to be picked up by umb. The umb man page says "Devices which fail to provide a conforming MBIM implementation will probably be attached as some other driver", does this indicate the MC7455 (as opposed to the EM7455, which is explicitly listed as compatible) isn't recognized as an MBIM device? It seems to work fine in MBIM mode under linux, and the umb driver does find it once umsm is disabled. Is there any way to access the serial interface of the device under openbsd in order to execute diagostic AT commands? Under linux in addition to the network device the card also generates a few USB serial devices, one of which can be used to run commands on it. I saw such devices with the umsm driver, but I don't see any with the umb driver. I haven't gotten any farther than installing the card and getting the umb driver to recognize it at this point, but it would be nice to be able to poke at it and see what the card has to say for itself. Thanks...
