Re: [Gumstix-users] Broadband USB HSDPA Modem Support

[Arigead <cap...@gm...>]

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Mathias Bage wrote:
> 
> On Wed, 4 Mar 2009, john wrote:
> 
>> Hello all,
>>    I'm playing with a broadband HSDPA Modem on the gumstix (Verdex)
>> but I'm not getting very far. I've searched around the Internet
>> according to what I can find the modem has been supported in Linux
>> Kernel since version 2.6.20. The modem works on my Ubuntu machine
>> without any configuration at all which is a 2.6.27-8-eeepc. On the
>> ubuntu machine I can see that when I plug in the USB Modem the kernel
>> loads the usbserial.ko module which is what I've read supports  the
>> modem.
>>
>> When I plug the USB Dongle into the Verdex the gumstix tries to load
>> the mass storage modules which is what I'd expect as Windows tries the
>> same thing and doesn't recognise the dongle as a modem. So I assumed
>> that what I needed to do was do a make menuconfig in the kernel
>> directory:
>>
>> .../gumstix-oe/tmp/work/gumstix-custom-verdex-angstrom-linux-gnueabi/gumstix-kernel-2.6.21-r1/linux-2.6.21
>>
>> and rebuild the kernel with new .config file. I'm afraid that I can't
>> find the options that I need to enable to get this device working. Has
>> anybody on the list used one of these or have any ideas.
> 
> Some USB broadband modems will initially be a mass storage device where 
> the Windows drivers are stored (at least that what my Huawei E220 does). 
> After installing the Windows drivers found there, the Windows driver will 
> tell the modem to "become" a modem.
> 
> Under Linux (debian in my case), I had to use a separate program for this 
> task. I used
> 
>    http://wwwu.uni-klu.ac.at/agebhard/HuaweiE220/huaweiAktBbo.c
> 
> but I'm not sure if it works for other brands.  This program will likely 
> also work on the Verdex.
> 
>> Thanks for any help on this
>>
>> John
> 
> /Mathias

Thanks for your response Mathias,

I'm very new to this and I'm missing a huge chunk of knowledge that I
obviously need. When the Huawei USB Dongle didn't work on the verdex I
assumed that the gumstix kernel didn't have usbserial built in as a
module which was why I wanted to rebuild the kernel. I had a look at the
config file for the gumstix kernel and it does include usbserial, so
that's not my problem.

Somehow the Ubuntu kernel I have knows to associate the usbserial module
with the Huawei Dongle. I've searched everywhere on the eee PC to find
out where it does this association. I thought it might be in udev rules
but can't find it there. I'm missing something.

I'll have a look at your C file, thanks, but can't understand how ubuntu
does it automatically. Like I say there's a huge gap in my knowledge.
I'll have a look at the linux device drivers book.

John
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