hello jyijyi,
I upgraded the firmware as you said
root@test201:/dev# atexecute ttyUSB2 “ATI”
ATI
Manufacturer: Sierra Wireless, Incorporated
Model: MC7421
Revision: SWI9X50C_01.14.13.00 883709 jenkins 2022/01/05 07:08:35
IMEI: 357339340309005
IMEI SV: 14
FSN: 912154221404B1
+GCAP: +CGSM
root@test201:/dev# atexecute ttyUSB2 “at!priid?”
at!priid?
PRI Part Number: 9909877
Revision: 002.048
Customer: GENERIC
Carrier PRI: 9999999_9907259_SWI9X50C_01.14.13.00_00_GENERIC_002.048_000
OK
but module crashes still here and after 100 reboots I collected the following results
1- module interfaces not created (13/100)
only ttyUSB1 appears (not functional) and hence Os couldn’t communicate with MC7421 either by qmi or serial (17/100 )
root@test201:/dev# ls
bus loop-control loop7 mtd3 mtd7 mtdblock4 ptmx ttyMSM0 ubi0_2 zero
console loop0 mesh_detect mtd3ro mtd7ro mtdblock5 pts ttyMSM1 ubi0_3
cpu_dma_latency loop1 mtd0 mtd4 mtd8 mtdblock6 random ttyS0 ubi0_4
full loop2 mtd0ro mtd4ro mtd8ro mtdblock7 shm ttyS1 ubi_ctrl
gpiochip0 loop3 mtd1 mtd5 mtdblock0 mtdblock8 stderr ttyUSB1 ubiblock0_1
hwrng loop4 mtd1ro mtd5ro mtdblock1 net stdin ubi0 urandom
kmsg loop5 mtd2 mtd6 mtdblock2 null stdout ubi0_0 watchdog
log loop6 mtd2ro mtd6ro mtdblock3 port tty ubi0_1 watchdog0
after reboot
root@test201:/dev# atexecute ttyUSB2 “AT!GCDUMP”
AT!GCDUMP
Src: FatalError
File: ds_rmnet_meta_sm.c
Line: 5285
Str: Assertion 0 failed
00000000 00000000 00000000 00000000
Prc: MPSS
Task: AMSS
Time: 000137C3
R0: 00000000 R1: C0046130 R2: EB102000 R3: CE8828E0 R4: 000000FE
R5: 00000000 R6: 00000025 R7: 00000001 R8: A55A6BB6 R9: 0000001F
R10: 00000000 R11: 00000004 R12: C0053E20 R13: 00000000 R14: C1565DC0
R15: 00000013 R16: C52488EA R17: 00000000 R18: 00000000 R19: 00000000
R20: C004601C R21: 00000000 R22: C3F8C794 R23: C3F8C798 R24: 5AC88526
R25: 00000000 R26: D00DFEED R27: DEADBEEF R28: CE87EFE8 SP: CE882430
FP: CE882438 LR: C009F27C
PC: 31A2AA87
CPSR: 00000000
Mod: Unknown
TOS
CE882458 31A2ABB3 00000000 00000000 C4A59F48 01000000 C52488EA
00000000 CE882468 31A2AA87 C12D5978 00000000 CE882470 3086005F
CE8824B0 312FCE9B CE8824B0 C3F8C790 CE8828E0 C15697BC 00000000
00000000 00000000 00000000 0000005A 0000007F C49F9E28 C0849684
C213DA8C 00000000 CE882550 309ADE7F
BOS
App ver: SWI9X50C_01.14.13.00
OK
root@test201:/dev#
root@test201:/dev# ls
bus log loop6 mtd2ro mtd6ro mtdblock3 port tty ubi0 urandom
cdc-wdm0 loop-control loop7 mtd3 mtd7 mtdblock4 ptmx ttyMSM0 ubi0_0 watchdog
console loop0 mesh_detect mtd3ro mtd7ro mtdblock5 pts ttyMSM1 ubi0_1 watchdog0
cpu_dma_latency loop1 mtd0 mtd4 mtd8 mtdblock6 random ttyS0 ubi0_2 zero
full loop2 mtd0ro mtd4ro mtd8ro mtdblock7 shm ttyS1 ubi0_3
gpiochip0 loop3 mtd1 mtd5 mtdblock0 mtdblock8 stderr ttyUSB0 ubi0_4
hwrng loop4 mtd1ro mtd5ro mtdblock1 net stdin ttyUSB1 ubi_ctrl
kmsg loop5 mtd2 mtd6 mtdblock2 null stdout ttyUSB2 ubiblock0_1
2- module hangs during operation (15/100)
the Os logged the following error
NETDEV WATCHDOG: wwan0 (qmi_wwan): transmit queue 0 timed out
3-QMI time out (31/100)
root@test201:/tmp# cat qmicli_error
error: operation failed: Transaction timed out
root@test201:/tmp# atexecute ttyUSB2 “AT!GCDUMP”
AT!GCDUMP
Src: FatalError
File: sys_m_smsm_mpss.c
Line: 285
Str: APPS force stop
00000000 00000000 00000000 00000000
Prc: MPSS
Task: AMSS
Time: 00085792
R0: 00000000 R1: C0046130 R2: EB102000 R3: 4FDE91A0 R4: 000000FE
R5: C3772C74 R6: 00000001 R7: 00000001 R8: C00A8770 R9: 018F0045
R10: 00000000 R11: C0110960 R12: C51B5000 R13: 4FDE91A0 R14: 719EDB61
R15: 00000186 R16: C51C61B2 R17: 00000000 R18: 00000000 R19: 00000000
R20: C004601C R21: 0000005A R22: 0000007F R23: 00000000 R24: 00000000
R25: 00000000 R26: 4FDE91A0 R27: C15697BC R28: 4FDA3430 SP: 4FDE8C18
FP: 4FDE8C20 LR: C009F27C
PC: 3900E2B1
CPSR: 00000000
Mod: Unknown
TOS
4FDE8C40 3900E385 C0791580 0000005A 00000002 C49F9E28 C51C61B2
C51BC2B8 4FDE8C50 3900E2B1 C51C6194 C51BC2B8 4FDE8C70 397006C9
00000000 00000001 00000000 C49F9E28 C213CF84 FFFFFFFF 4FDE8D18
38386DB5 00000000 0631340D C213CF68 00000000 C213CF84 FFFFFFFF
00000000 C49F9E28 C0791580 0000005A
BOS
App ver: SWI9X50C_01.14.13.00
Src: FatalError
Str: Recursive fault!
00000000 00000000 00000000 00000000
Prc: APSS
Task: C50F8A80
Time: 00000000
R0: 00000000 R1: 00000000 R2: 00000000 R3: 00000000 R4: 00000000
R5: 00000000 R6: 00000000 R7: 00000000 R8: 00000000 R9: 00000000
R10: 00000000 R11: C50FFEBC R12: 00000000 R13: C50FFE90 R14: C0011DC4
PC: C001483C
CPSR: 00000000
Mod: Unknown
TOS
C0011DC4 88BC8594 C001F1E8 00000023 C07BF984 C0E124F8 C0A1D204
00000000 001190D8 C50FFF88 C001F298 00000000 00000023 C0A18DB4
C07BF984 00000001 C1067DF8 00000000 C07DD134 C50FFF88 00000001
C0E9508C C65FB100 00000001 C013A994 C50FFF88 001190D8 00000002
00000002 00000002 C5B246C0 001190D8
BOS
OK
→ according to to those results The module failed to operate except for 41 cases
do you have any suggestion to overcome this issue