RC7620 and Linux driver

it is unclear to me if the linux in-tree qmi_wwan driver are compatible with RC7620 modem,
or if I MUST use out-of-tree Gobi Sierra driver.
qmi_wwan approach will be much simpler in my scenario.

Hi mt_0x,

You should use the MBPL driver from Sierra for RC7620 on Linux.
You can refer here Example on establishing data connection by AT!SCACT via MBPL R20 driver to get it.

Please help to tick “Solutions” if your question is answered.

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Thank you Donald,
can you address me to a link on Sierra website where is highlighted to use MBPL for RC7620 instead of Gobi/other?
I cannot find any useful resource…
Best regards

Why? AFAICS, that’s just a snapshot of qmi_wwan taken some time between v5.1 and v5.2, with some backporting added. I guess it could make sense if you use an old kernel without longterm stable support (i.e som BSP crap). But I really cannot see any advantage if you’re using newer kernels. On the contrary. Messing with an out-of-tree version of a driver which is maintained in mainline Linux just seems stupid.

But what do I know? Maybe this does make sense somehow

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The MPBL driver on Linux is the official Sierra driver for the RC7620 on https://source.sierrawireless.com/.
I recommend for mt_0x the official Sierra Linux driver for RC7620.



Ok thank you @Donald but the last link (qmi_wwan Sierra drivere) report EOL, correct?
And in MPBL there is no qmi_wwan but only GOBI.
Please tell me if I’m wrong… I’m a little bit confused

I’m trying to use in-tree qmi_wwan driver of kernel 4.19 but it doesn’t work, or I am missing something.
Which kernel are you using?


Hi mt_0x ,

You can get it here
MBPL_Drivers_USB_R20_ENG1-src.tar.gz (23.0 KB)