topic Re: GSM module detection issue on SM2S-IMX93 in i.MX Processors

GSM module detection issue on SM2S-IMX93

sarathcdac07 — Thu, 29 Jan 2026 11:43:39 GMT

Hi,
I am working on imx93 board and i have a GSM module of sierra em9291, which is connected to the obu board using M.2 slot. The device is expected to be detected as a USB device, but the module is not getting detected. It is confirmed that the module is working. I am attaching the dmesg received while booting the obu board.

[ 0.931828] VFIO - User Level meta-driver version: 0.3
[ 0.938331] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 0.944887] ehci-pci: EHCI PCI platform driver
[ 0.949365] ehci-platform: EHCI generic platform driver
[ 0.954737] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[ 0.960930] ohci-pci: OHCI PCI platform driver
[ 0.965405] ohci-platform: OHCI generic platform driver
[ 0.971142] usbcore: registered new interface driver uas
[ 0.976500] usbcore: registered new interface driver usb-storage
[ 0.982570] usbcore: registered new interface driver usbserial_generic
[ 0.989104] usbserial: USB Serial support registered for generic
[ 0.995126] usbcore: registered new interface driver ftdi_sio
[ 1.000867] usbserial: USB Serial support registered for FTDI USB Serial Device
[ 1.008187] usbcore: registered new interface driver qcaux
[ 1.013668] usbserial: USB Serial support registered for qcaux
[ 1.019508] usbcore: registered new interface driver qcserial
[ 1.025262] usbserial: USB Serial support registered for Qualcomm USB modem
[ 1.032230] usbcore: registered new interface driver sierra
[ 1.037803] usbserial: USB Serial support registered for Sierra USB modem
[ 1.044605] usbcore: registered new interface driver usb_serial_simple
[ 1.051134] usbserial: USB Serial support registered for carelink
[ 1.057225] usbserial: USB Serial support registered for zio
[ 1.062885] usbserial: USB Serial support registered for funsoft
[ 1.068896] usbserial: USB Serial support registered for flashloader
[ 1.075243] usbserial: USB Serial support registered for google
[ 1.081165] usbserial: USB Serial support registered for libtransistor
[ 1.087688] usbserial: USB Serial support registered for vivopay
[ 1.093694] usbserial: USB Serial support registered for moto_modem
[ 1.099962] usbserial: USB Serial support registered for motorola_tetra
[ 1.106578] usbserial: USB Serial support registered for nokia
[ 1.112406] usbserial: USB Serial support registered for novatel_gps
[ 1.118758] usbserial: USB Serial support registered for hp4x
[ 1.124505] usbserial: USB Serial support registered for suunto
[ 1.130430] usbserial: USB Serial support registered for siemens_mpi
[ 1.136787] usbcore: registered new interface driver usb_ehset_test
[ 1.144781] bbnsm_pwrkey 44440000.bbnsm:pwrkey: KEY_POWER without setting in dts
[ 1.153199] input: 44440000.bbnsm:pwrkey as /devices/platform/soc@0/44000000.bus/44440000.bbnsm/44440000.bbnsm:pwrkey/input/input0
[ 1.168562] bbnsm_rtc 44440000.bbnsm:rtc: registered as rtc1
[ 1.174625] i2c_dev: i2c /dev entries driver
[ 1.180869] Bluetooth: HCI UART driver ver 2.3
[ 1.185332] Bluetooth: HCI UART protocol H4 registered
[ 1.190459] Bluetooth: HCI UART protocol BCSP registered
[ 1.195781] Bluetooth: HCI UART protocol LL registered
[ 1.200911] Bluetooth: HCI UART protocol ATH3K registered
[ 1.206312] Bluetooth: HCI UART protocol Three-wire (H5) registered
[ 1.212646] Bluetooth: HCI UART protocol Broadcom registered
[ 1.218306] Bluetooth: HCI UART protocol QCA registered
[ 1.224585] sdhci: Secure Digital Host Controller Interface driver
[ 1.230771] sdhci: Copyright(c) Pierre Ossman
[ 1.235471] Synopsys Designware Multimedia Card Interface Driver
[ 1.241788] sdhci-pltfm: SDHCI platform and OF driver helper
[ 1.248334] ledtrig-cpu: registered to indicate activity on CPUs
[ 1.255190] SMCCC: SOC_ID: ARCH_SOC_ID not implemented, skipping ....
[ 1.262002] usbcore: registered new interface driver usbhid
[ 1.267582] usbhid: USB HID core driver
[ 1.274075] cs_system_cfg: CoreSight Configuration manager initialised
[ 1.279383] mmc0: SDHCI controller on 42850000.mmc [42850000.mmc] using ADMA
[ 1.281330] optee: probing for conduit method.
[ 1.292295] optee: revision 3.21 (4e322819)
[ 1.292765] optee: dynamic shared memory is enabled
[ 1.302169] optee: initialized driver
[ 1.309028] NET: Registered PF_LLC protocol family
[ 1.314219] NET: Registered PF_INET6 protocol family
[ 1.319851] Segment Routing with IPv6
[ 1.323558] In-situ OAM (IOAM) with IPv6
[ 1.327546] NET: Registered PF_PACKET protocol family
[ 1.332736] Bluetooth: RFCOMM TTY layer initialized
[ 1.337666] Bluetooth: RFCOMM socket layer initialized
[ 1.342834] Bluetooth: RFCOMM ver 1.11
[ 1.346599] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 1.351905] Bluetooth: BNEP filters: protocol multicast
[ 1.357134] Bluetooth: BNEP socket layer initialized
[ 1.362102] Bluetooth: HIDP (Human Interface Emulation) ver 1.2
[ 1.368173] Bluetooth: HIDP socket layer initialized
[ 1.373462] 8021q: 802.1Q VLAN Support v1.8
[ 1.377770] 9pnet: Installing 9P2000 support
[ 1.382072] tsn generic netlink module v1 init...
[ 1.386857] Key type dns_resolver registered
[ 1.391436] Loading compiled-in X.509 certificates
[ 1.401620] mmc0: new HS400 Enhanced strobe MMC card at address 0001
[ 1.406271] usb_phy_generic soc@0:usbphynop1: supply vcc not found, using dummy regulator
[ 1.412543] mmcblk0: mmc0:0001 IB2916 14.6 GiB
[ 1.416324] usb_phy_generic soc@0:usbphynop1: dummy supplies not allowed for exclusive requests
[ 1.429790] usb_phy_generic soc@0:usbphynop2: supply vcc not found, using dummy regulator
[ 1.429826] mmcblk0boot0: mmc0:0001 IB2916 4.00 MiB
[ 1.438122] usb_phy_generic soc@0:usbphynop2: dummy supplies not allowed for exclusive requests
[ 1.444228] mmcblk0boot1: mmc0:0001 IB2916 4.00 MiB
[ 1.457681] mmcblk0rpmb: mmc0:0001 IB2916 4.00 MiB, chardev (510:0)
[ 1.462392] fsl_lpspi 42550000.spi: dma setup error -19, use pio
[ 1.471555] fsl_lpspi 42700000.spi: dma setup error -19, use pio
[ 1.481628] sdhci-esdhc-imx 42860000.mmc: Got CD GPIO
[ 1.483514] rtc-rs5c372 0-0032: r2223x found, 24hr
[ 1.491776] rtc-rs5c372 0-0032: eco mode enabled
[ 1.497022] rtc-rs5c372 0-0032: rtc oscillator interruption detected. Please reset the rtc clock.
[ 1.506032] rtc-rs5c372 0-0032: registered as rtc0
[ 1.511293] rtc-rs5c372 0-0032: rtc oscillator interruption detected. Please reset the rtc clock.
[ 1.518103] mmc1: SDHCI controller on 42860000.mmc [42860000.mmc] using ADMA
[ 1.520159] rtc-rs5c372 0-0032: hctosys: unable to read the hardware clock
[ 1.534862] i2c i2c-0: LPI2C adapter registered
[ 1.540762] VCC_SOC_0V8: Bringing 900000uV into 800000-800000uV
[ 1.550695] rn5t618 1-0030: running in single/master mode
[ 1.556229] i2c i2c-1: LPI2C adapter registered
[ 1.561451] i2c i2c-2: LPI2C adapter registered
[ 1.567013] pca953x 4-0022: supply vcc not found, using dummy regulator
[ 1.573737] pca953x 4-0022: using AI
[ 1.578406] gpio-488 (boot_sel0): hogged as input
[ 1.583227] gpio-489 (boot_sel1): hogged as input
[ 1.588029] gpio-490 (boot_sel2): hogged as input
[ 1.593032] gpio-498 (wifi_en): hogged as output/low
[ 1.598179] gpio-499 (gbe0_rst): hogged as output/high
[ 1.603518] gpio-500 (gbe1_rst): hogged as output/high
[ 1.608840] gpio-501 (usb_rst): hogged as output/low
[ 1.614112] i2c i2c-4: LPI2C adapter registered
[ 1.618686] mmc1: host does not support reading read-only switch, assuming write-enable
[ 1.624451] pps pps0: new PPS source ptp0
[ 1.634301] fec 42890000.ethernet eth0: registered PHC device 0
[ 1.641039] imx-dwmac 428a0000.ethernet: IRQ eth_lpi not found
[ 1.647260] imx-dwmac 428a0000.ethernet: User ID: 0x10, Synopsys ID: 0x52
[ 1.654155] imx-dwmac 428a0000.ethernet: DWMAC4/5
[ 1.659958] imx-dwmac 428a0000.ethernet: DMA HW capability register supported
[ 1.667100] imx-dwmac 428a0000.ethernet: RX Checksum Offload Engine supported
[ 1.674235] imx-dwmac 428a0000.ethernet: TX Checksum insertion supported
[ 1.680926] imx-dwmac 428a0000.ethernet: Wake-Up On Lan supported
[ 1.687072] imx-dwmac 428a0000.ethernet: Enable RX Mitigation via HW Watchdog Timer
[ 1.694737] imx-dwmac 428a0000.ethernet: Enabled L3L4 Flow TC (entries=8)
[ 1.701520] imx-dwmac 428a0000.ethernet: Enabled RFS Flow TC (entries=8)
[ 1.708233] imx-dwmac 428a0000.ethernet: Enabling HW TC (entries=256, max_off=256)
[ 1.715805] imx-dwmac 428a0000.ethernet: Using 32 bits DMA width
[ 1.721914] mmc1: new ultra high speed SDR104 SDHC card at address aaaa
[ 1.727699] ci_hdrc ci_hdrc.0: EHCI Host Controller
[ 1.729047] mmcblk1: mmc1:aaaa SK32G 29.7 GiB
[ 1.733484] ci_hdrc ci_hdrc.0: new USB bus registered, assigned bus number 1
[ 1.745048] mmcblk1: p1 p2
[ 1.760163] ci_hdrc ci_hdrc.0: USB 2.0 started, EHCI 1.00
[ 1.765999] hub 1-0:1.0: USB hub found
[ 1.769782] hub 1-0:1.0: 1 port detected
[ 1.777856] ci_hdrc ci_hdrc.1: EHCI Host Controller
[ 1.782766] ci_hdrc ci_hdrc.1: new USB bus registered, assigned bus number 2
[ 1.804160] ci_hdrc ci_hdrc.1: USB 2.0 started, EHCI 1.00
[ 1.810031] hub 2-0:1.0: USB hub found
[ 1.813807] hub 2-0:1.0: 1 port detected
[ 1.819619] cfg80211: Loading compiled-in X.509 certificates for regulatory database
[ 1.828751] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
[ 1.835382] platform regulatory.0: Direct firmware load for regulatory.db failed with error -2
[ 1.836751] ALSA device list:
[ 1.844007] platform regulatory.0: Falling back to sysfs fallback for: regulatory.db
[ 1.847023] No soundcards found.
[ 1.872310] EXT4-fs (mmcblk1p2): mounted filesystem with ordered data mode. Opts: (null). Quota mode: none.
[ 1.882126] VFS: Mounted root (ext4 filesystem) on device 179:98.
[ 1.888794] devtmpfs: mounted
[ 1.893640] Freeing unused kernel memory: 2816K
[ 1.898295] Run /sbin/init as init process
[ 2.028179] usb 1-1: new full-speed USB device number 2 using ci_hdrc
[ 2.040991] systemd[1]: System time before build time, advancing clock.
[ 2.062635] systemd[1]: systemd 250.5+ running in system mode (+PAM -AUDIT -SELINUX -APPARMOR +IMA -SMACK +SECCOMP -GCRYPT -GNUTLS -OPENSSL +ACL +BLKID -CURL -ELFUTILS -FIDO2 -IDN2 -IDN -IPTC +KMOD -LIBCRYPTSETUP +LIBFDISK -PCRE2 -PWQUALITY -P11KIT -QRENCODE -BZIP2 -LZ4 -XZ -ZLIB +ZSTD -BPF_FRAMEWORK -XKBCOMMON +UTMP +SYSVINIT default-hierarchy=hybrid)
[ 2.093842] usb 2-1: new high-speed USB device number 2 using ci_hdrc
[ 2.096607] systemd[1]: Detected architecture arm64.

Welcome to Poky (Yocto Project Reference Distro) 4.0.4 (kirkstone)!

[ 2.172996] systemd[1]: Hostname set to <sm2s-imx93>.
[ 2.199166] usb 1-1: not running at top speed; connect to a high speed hub
[ 2.244999] systemd-sysv-generator[162]: SysV service '/etc/init.d/cmdline-keyboard.sh' lacks a native systemd unit file. Automatically generating a unit file for compatibility. Please update package to include a native systemd unit file, in order to make it more safe and robust.
[ 2.271158] hub 2-1:1.0: USB hub found
[ 2.275119] hub 2-1:1.0: 4 ports detected

Re: GSM module detection issue on SM2S-IMX93

Bio_TICFSL — Thu, 29 Jan 2026 13:58:30 GMT

Hello,

I confirm that the module is working but there is no driver for you GSM, so Adapt your driver with the latest BSP.

regards

Re: GSM module detection issue on SM2S-IMX93

sarathcdac07 — Fri, 30 Jan 2026 12:18:57 GMT

Hello ,

As you suggested , I added the support for sierra em929x in my qcserial.c and qmi_wwan.c. Now this is the dmesg which i get. I am also attaching the driver files which i got from sierra official website.

[ 0.412001] usbcore: registered new interface driver usbfs
[ 0.417403] usbcore: registered new interface driver hub
[ 0.422531] usbcore: registered new device driver usb
[ 0.947802] usbcore: registered new interface driver asix
[ 0.953237] usbcore: registered new interface driver ax88179_178a
[ 0.959343] usbcore: registered new interface driver cdc_ether
[ 0.965189] usbcore: registered new interface driver cdc_eem
[ 0.970862] usbcore: registered new interface driver net1080
[ 0.976554] usbcore: registered new interface driver cdc_subset
[ 0.982493] usbcore: registered new interface driver zaurus
[ 0.988093] usbcore: registered new interface driver sierra_net
[ 0.994025] usbcore: registered new interface driver cdc_ncm
[ 0.999694] usbcore: registered new interface driver qmi_wwan
[ 1.005443] usbcore: registered new interface driver cdc_mbim
[ 1.018389] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 1.034796] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[ 1.051077] usbcore: registered new interface driver cdc_acm
[ 1.056733] cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters
[ 1.064752] usbcore: registered new interface driver cdc_wdm
[ 1.070600] usbcore: registered new interface driver uas
[ 1.075953] usbcore: registered new interface driver usb-storage
[ 1.082007] usbcore: registered new interface driver usbserial_generic
[ 1.088535] usbserial: USB Serial support registered for generic
[ 1.094555] usbcore: registered new interface driver ftdi_sio
[ 1.100301] usbserial: USB Serial support registered for FTDI USB Serial Device
[ 1.107612] usbcore: registered new interface driver option
[ 1.113189] usbserial: USB Serial support registered for GSM modem (1-port)
[ 1.120185] usbcore: registered new interface driver qcaux
[ 1.125668] usbserial: USB Serial support registered for qcaux
[ 1.131506] usbcore: registered new interface driver qcserial
[ 1.137254] usbserial: USB Serial support registered for Qualcomm USB modem
[ 1.144214] usbserial: USB Serial support registered for Qualcomm USB modem
[ 1.151181] usbcore: registered new interface driver sierra
[ 1.156768] usbserial: USB Serial support registered for Sierra USB modem
[ 1.163559] usbcore: registered new interface driver usb_serial_simple
[ 1.170085] usbserial: USB Serial support registered for carelink
[ 1.176180] usbserial: USB Serial support registered for zio
[ 1.181835] usbserial: USB Serial support registered for funsoft
[ 1.187841] usbserial: USB Serial support registered for flashloader
[ 1.194195] usbserial: USB Serial support registered for google
[ 1.200113] usbserial: USB Serial support registered for libtransistor
[ 1.206638] usbserial: USB Serial support registered for vivopay
[ 1.212645] usbserial: USB Serial support registered for moto_modem
[ 1.218917] usbserial: USB Serial support registered for motorola_tetra
[ 1.225524] usbserial: USB Serial support registered for nokia
[ 1.231357] usbserial: USB Serial support registered for novatel_gps
[ 1.237709] usbserial: USB Serial support registered for hp4x
[ 1.243458] usbserial: USB Serial support registered for suunto
[ 1.249374] usbserial: USB Serial support registered for siemens_mpi
[ 1.255737] usbcore: registered new interface driver visor
[ 1.261222] usbserial: USB Serial support registered for Handspring Visor / Palm OS
[ 1.268875] usbserial: USB Serial support registered for Sony Clie 5.0
[ 1.275401] usbserial: USB Serial support registered for Sony Clie 3.5
[ 1.281941] usbcore: registered new interface driver usb_ehset_test
[ 1.441809] usbcore: registered new interface driver usbhid
[ 1.450588] usbhid: USB HID core driver
[ 1.591110] usb_phy_generic soc@0:usbphynop1: supply vcc not found, using dummy regulator
[ 1.599967] usb_phy_generic soc@0:usbphynop1: dummy supplies not allowed for exclusive requests
[ 1.614753] usb_phy_generic soc@0:usbphynop2: supply vcc not found, using dummy regulator
[ 1.623087] usb_phy_generic soc@0:usbphynop2: dummy supplies not allowed for exclusive requests
[ 1.844214] gpio-501 (usb_rst): hogged as output/high
[ 1.998619] ci_hdrc ci_hdrc.1: new USB bus registered, assigned bus number 1
[ 2.020156] ci_hdrc ci_hdrc.1: USB 2.0 started, EHCI 1.00
[ 2.025987] hub 1-0:1.0: USB hub found