Hello Dear misc,
Model Full Name: Sierra Wireless, Incorporated Sierra Wireless EM7455
Qualcomm\M-. Snapdragon? X7 LTE-A
I have an OpenBSD system, and I want to use the Sierra Wireless modem as
the Umb interface. I changed the LTE mode to MBIM, but OpenBSD does not
recognize it as an Umb Interface.
I changed the MBIM mode using the command 'cu -l /dev/cuaU2 -s 9600,'
connecting and executing AT commands. After switching to MBIM mode, I am
unable to access it using OpenBSD's cu commands. However, I successfully
connected and confirmed that the MBIM mode change was done successfully
using cu on a Linux system(ubuntu). It’s fully operational under Linux.
When attempting to connect to cuaU2 after the MBIM mode change, I encounter
the following errors:
OpenBSD# cu -l /dev/cuaU0 -s 9600
cu: open("/dev/cuaU0"): Input/output error
OpenBSD# cu -l /dev/cuaU1 -s 9600
cu: open("/dev/cuaU1"): Input/output error
OpenBSD# cu -l /dev/cuaU2 -s 9600
cu: open("/dev/cuaU2"): Device not configured
OpenBSD# cu -l /dev/cuaU3 -s 9600
cu: open("/dev/cuaU3"): Device not configured
OpenBSD#
Is there a way to solve this problem, or does OpenBSD not support Sierra
Wireless modem?
The driver's dmesg and usbdevs output are as follows:
*dmesg:*
umsm0 at uhub1 port 3 configuration 1 interface 0 "Sierra Wireless,
Incorporated Sierra Wireless EM7455 Qualcomm\M-. Snapdragon? X7 LTE-A" rev
2.10/0.06 addr 6
ucom0 at umsm0
umsm1 at uhub1 port 3 configuration 1 interface 3 "Sierra Wireless,
Incorporated Sierra Wireless EM7455 Qualcomm\M-. Snapdragon? X7 LTE-A" rev
2.10/0.06 addr 6
ucom1 at umsm1
umsm2 at uhub1 port 3 configuration 1 interface 12 "Sierra Wireless,
Incorporated Sierra Wireless EM7455 Qualcomm\M-. Snapdragon? X7 LTE-A" rev
2.10/0.06 addr 6
umsm2: missing endpoint
umsm3 at uhub1 port 3 configuration 1 interface 13 "Sierra Wireless,
Incorporated Sierra Wireless EM7455 Qualcomm\M-. Snapdragon? X7 LTE-A" rev
2.10/0.06 addr 6
umsm3: missing endpoint
*usbdevs:*
addr 06: 1199:9071 Sierra Wireless, Incorporated, Sierra Wireless EM7455
Qualcomm\M-. Snapdragon? X7 LTE-A
high speed, power 500 mA, config 1, rev 0.06, iSerial
LF93858930021032
driver: umsm0
driver: umsm1
driver: umsm2
driver: umsm3
Thank you in advance for your help.
