Fibocom L850-GL / Intel XMM7360

Thu Jun 25 16:51:27 UTC 2020

There are carrier firmware packages for some, but not all, carriers
(some use a generic carrier firmware instead). I'm not sure how you
are expected to flash them without the closed-source firmware download
tool, though.

On Thu, Jun 25, 2020 at 12:21 AM Wassenberg, Dennis
<Dennis.Wassenberg at secunet.com> wrote:
>
> Hi Eric,
>
> I think this is a very helpful hint!
>
> We already started contacting Fibocom. If we know that there is in general a firmware available which forces the module
> in USB mode this would be a discussion option.
>
> How does this firmware behaves in terms of provider specific firmware versions? Are there carrier specific firmware
> available too or is there a generic firmware necessary only?
>
> Thank you & best regards,
>
> Dennis
>
> On Wed, 2020-06-24 at 14:54 -0700, Eric Caruso wrote:
> > On Chromebooks, we use the L850-GL in USB mode and it works well. I
> > believe the firmware we get from Fibocom forces the module into USB
> > mode, though, so that might not be super helpful for this discussion.
> >
> > On Tue, Jun 23, 2020 at 4:21 AM Wassenberg, Dennis
> > <Dennis.Wassenberg at secunet.com> wrote:
> > >
> > > Hi all,
> > >
> > > thank you for these hints!
> > >
> > > I think I will try the Intel XMM 7560 / Fibocom L860 modem as well.
> > >
> > > @Dan: You said that there is a (alpha/beta) driver existing. Is there a possibility to get it to have a try how this
> > > behaves?
> > >
> > > Thank you & best regards,
> > >
> > > Dennis
> > >
> > > On Mon, 2020-06-22 at 11:23 -0500, Dan Williams wrote:
> > > > On Mon, 2020-06-22 at 10:45 +0200, Reinhard Speyerer wrote:
> > > > > On Mon, Jun 22, 2020 at 06:51:50AM +0000, Wassenberg, Dennis wrote:
> > > > > > Hi all,
> > > > > >
> > > > > > I tested the PCI approach.
> > > > > >
> > > > > > Unfortunately I had no luck. The kernel PCI driver at
> > > > > > https://github.com/xmm7360/xmm7360-pci can not initiale the modem
> > > > > > correctly. The modem stays at status=0xfeedb007. This seems to mean
> > > > > > that the modem is (still) booting. After 20 seconds
> > > > > > probing fails. The kernel driver gives up waiting for the device to
> > > > > > boot.
> > > > > >
> > > > > > So, both options: usb switch and native pci driver will not work.
> > > > > >
> > > > > > Are there any ideas how to continue?
> > > > > >
> > > > >
> > > > > Hi Dennis,
> > > > >
> > > > > some time ago Johannes Berg was working on a WWAN subsystem for the
> > > > > Linux
> > > > > kernel (
> > > > > https://lore.kernel.org/netdev/20200225100053.16385-1-johannes@sipsolutions.net/T/#t
> > > > > ) which also mentioned the 'upcoming Intel 4G modem driver ("iosm")'.
> > > >
> > > > That effort is currently stalled. And the pci-based driver you mention
> > > > supports 7560 and later, not earlier devices. Not sure how hard it
> > > > would be to adapt to earlier devices though.
> > > >
> > > > It does exist, but it's not quite ready for upstreaming yet.
> > > >
> > > > Dan
> > > >
> > > > > Perhaps it might help to ask him what the current status of this
> > > > > project is.
> > > > >
> > > > > Regards,
> > > > > Reinhard
> > > > >
> > > > > > Thank you & best regards,
> > > > > >
> > > > > > Dennis
> > > > > >
> > > > > >
> > > > > > On Thu, 2020-06-18 at 16:24 +0200, Dennis Wassenberg wrote:
> > > > > > > Hi Bjørn,
> > > > > > >
> > > > > > > thank you for your estimation.
> > > > > > >
> > > > > > > > Do you have any confirmation that it is actually possible to
> > > > > > > > switch this
> > > > > > > > firmware into USB mode?  Are there other firmwares available
> > > > > > > > with
> > > > > > > > (possible) USB support?
> > > > > > > >
> > > > > > >
> > > > > > > I don't have a confirmation that the USB mode will really work,
> > > > > > > especially on the new models.
> > > > > > >
> > > > > > > Last year (Lenovo Thinkpad Whiskey Lake series) there was the
> > > > > > > possibility to choose between the slow modem (Fibocom
> > > > > > > L830-EB) and the faster option Fibocom L850-GL. This year the
> > > > > > > slow modem ist the fast modem of the last year and the
> > > > > > > fast modem is CAT16 Fibocom L860-GL.
> > > > > > >
> > > > > > > Regarding the Lenovo Thinkpad Whiskey Lake series models I found
> > > > > > > some threads where the USB mode switch worked:
> > > > > > >
> > > > > > >
> > >
> > >
> https://forums.lenovo.com/t5/Other-Linux-Discussions/WWAN-Fibocom-L850-GL-and-Linux-support/m-p/4318903?page=1#4327397
> > > > > > > https://gmt-24.net/archives/1461
> > > > > > >
> > > > > > > Thats why I assumed that this might work at newer Thinkpads as
> > > > > > > well.
> > > > > > >
> > > > > > > Especially https://gmt-24.net/archives/1461 shows that your
> > > > > > > assumption regarding the bootloader and application mode
> > > > > > > seems to be correct.
> > > > > > >
> > > > > > > This comes out directly after disabling the PCIe link and
> > > > > > > directly after that:
> > > > > > > [  162.799214] usb 1-6: new high-speed USB device number 5 using
> > > > > > > xhci_hcd
> > > > > > > [  162.940604] usb 1-6: New USB device found, idVendor=8087,
> > > > > > > idProduct=07f5, bcdDevice= 0.00
> > > > > > > [  162.940612] usb 1-6: New USB device strings: Mfr=0, Product=0,
> > > > > > > SerialNumber=0
> > > > > > > [  169.651754] usb 1-6: USB disconnect, device number 5
> > > > > > >
> > > > > > > Now bcdDevice changed to real device id.
> > > > > > >
> > > > > > > [  175.462630] usb 1-6: new high-speed USB device number 6 using
> > > > > > > xhci_hcd
> > > > > > > [  175.620153] usb 1-6: New USB device found, idVendor=2cb7,
> > > > > > > idProduct=0007, bcdDevice= 3.33
> > > > > > > [  175.620162] usb 1-6: New USB device strings: Mfr=1, Product=2,
> > > > > > > SerialNumber=3
> > > > > > > [  175.620167] usb 1-6: Product: L850-GL
> > > > > > > [  175.620172] usb 1-6: Manufacturer: Fibocom Wireless Inc.
> > > > > > > [  175.620176] usb 1-6: SerialNumber: 004999010640000
> > > > > > >
> > > > > > >
> > > > > > > > Anyway, FWIW, I'd explore the PCIe driver option first if I
> > > > > > > > were you.
> > > > > > > > That's the only mode tested by anyone, so it is more likely to
> > > > > > > > work.
> > > > > > >
> > > > > > > Ok, I will try that approach and let you know my results.
> > > > > > >
> > > > > > > Thank you & best regards,
> > > > > > >
> > > > > > > Dennis
> > > > > > >
> > > > > > >
> > > > > > > On Thu, 2020-06-18 at 15:36 +0200, Bjørn Mork wrote:
> > > > > > > > "Wassenberg, Dennis" <Dennis.Wassenberg at secunet.com> writes:
> > > > > > > >
> > > > > > > > > After that dmesg shows this:
> > > > > > > > > [ 930.843781] usb 1-7: new high-speed USB device number 16
> > > > > > > > > using xhci_hcd
> > > > > > > > > [ 930.996572] usb 1-7: New USB device found, idVendor=8087,
> > > > > > > > > idProduct=07f5, bcdDevice= 0.00
> > > > > > > > > [ 930.996577] usb 1-7: New USB device strings: Mfr=0,
> > > > > > > > > Product=0, SerialNumber=0
> > > > > > > > > [ 937.683939] usb 1-7: USB disconnect, device number 16
> > > > > > > > >
> > > > > > > > > So, in general I think there should be USB lines routed to
> > > > > > > > > the M.2 slot but I have no idea why the device leaves
> > > > > > > > > the
> > > > > > > > > bus. It is possible to run the script again and again but in
> > > > > > > > > the end it will always disconnect automatically.
> > > > > > > >
> > > > > > > > I know nothing about these modems, but my guess is that this is
> > > > > > > > a
> > > > > > > > bootloader mode. Mostly based on the assumption that there will
> > > > > > > > be one,
> > > > > > > > and that the vendor-id will be something non-Intel in
> > > > > > > > application mode.
> > > > > > > >
> > > > > > > > You can probably confirm this by capturing the full device
> > > > > > > > descriptor,
> > > > > > > > e.g by creating a udev rule to dump it or simply by snooping on
> > > > > > > > the bus.
> > > > > > > >
> > > > > > > > If this assumption is correct, then the firmware was supposed
> > > > > > > > to boot
> > > > > > > > into an application mode and then reconnect to the USB bus with
> > > > > > > > its real
> > > > > > > > device ID and descriptors.  This could be failing due to a
> > > > > > > > firmware
> > > > > > > > crash, maybe caused by this unexpected state.  Or more
> > > > > > > > likely:  The
> > > > > > > > firmware on this modem is built without support for the USB
> > > > > > > > mode.
> > > > > > > >
> > > > > > > > Do you have any confirmation that it is actually possible to
> > > > > > > > switch this
> > > > > > > > firmware into USB mode?  Are there other firmwares available
> > > > > > > > with
> > > > > > > > (possible) USB support?
> > > > > > > >
> > > > > > > >
> > > > > > > > Anyway, FWIW, I'd explore the PCIe driver option first if I
> > > > > > > > were you.
> > > > > > > > That's the only mode tested by anyone, so it is more likely to
> > > > > > > > work.
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > > Bjørn
> > > > > >
> > > > > > _______________________________________________
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> > > > >
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> > > > >
> > > >
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> > >
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