[FS#641] Quectel ECXX and Raw IP on 4.4 kernel

[LEDE Bugs]

The following task has a new comment added:

FS#641 - Quectel ECXX and Raw IP on 4.4 kernel
User who did this - dchard (dchard)

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I confirm this problem stil exist with latest LEDE snapshot and kernel 4.4.71 and modem:

Quectel
EC25
Revision: EC25EFAR02A06M4G

The usb devid is: 2c7c:0125

If I install the QMI related stuff (usb-modeswitch kmod-mii kmod-usb-net kmod-usb-wdm kmod-usb-net-qmi-wwan uqmi) the CDC interface is not popping up at all, even with the above mentioned method (echo “2c7c 0125” >/sys/bus/usb/drivers/qmi_wwan/new_id)

If I install the option driver related stuff (kmod-usb-serial-option kmod-usb-serial kmod-usb-serial-wwan), the 4 virtual ttyUSB interfaces are up, interface 2 and 3 are responding to AT commands via minicom, yet it is not possible to start a PDN connection.

cat /sys/kernel/debug/usb/devices
T:  Bus=01 Lev=02 Prnt=02 Port=01 Cnt=02 Dev#=  4 Spd=480  MxCh= 0
D:  Ver= 2.00 Cls=ef(misc ) Sub=02 Prot=01 MxPS=64 #Cfgs=  1
P:  Vendor=2c7c ProdID=0125 Rev= 3.18
S:  Manufacturer=Android
S:  Product=Android
C:* #Ifs= 5 Cfg#= 1 Atr=a0 MxPwr=500mA
I:* If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
E:  Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=01(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 1 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
E:  Ad=83(I) Atr=03(Int.) MxPS=  10 Ivl=32ms
E:  Ad=82(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 2 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
E:  Ad=85(I) Atr=03(Int.) MxPS=  10 Ivl=32ms
E:  Ad=84(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=03(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 3 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
E:  Ad=87(I) Atr=03(Int.) MxPS=  10 Ivl=32ms
E:  Ad=86(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=04(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 4 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=usbserial_generic
E:  Ad=89(I) Atr=03(Int.) MxPS=   8 Ivl=32ms
E:  Ad=88(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=05(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms


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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=641#comment2853