Re: [Gumstix-users] Question on Siemens MC75 module

[Craig H. <cr...@gu...>]

On Jul 13, 2007, at 8:08 AM, Bill Gatliff wrote:

> Regarding the product discussed here:
>
> http://www.linuxdevices.com/news/NS5947466557.html
>
> This board looks like an interesting one for an upcoming project.
>
> I skimmed the datasheet, and it looks like the Siemens MC75 uses  
> USB RIL
> (Radio Interface Layer), which I can't find discussed in any Linux
> kernel source code.  How are you handling communications to this chip?
> Is it via a proprietary kernel module, or a GPL-licensed one?

All the code will be completely open source.  If kernel modules are  
involved, they'll be GPL.  Right now, I've been using an RS232  
connection to the MC75.  I'll be working on the USB side in the  
coming days.

> I'm hoping the latter, because my kernel versions move all the time  
> and
> I can't afford to be locked to a particular kernel version or
> configuration due to a proprietary kernel module.  Having the source
> code lets me migrate the support forward as necessary.

Amen.

> I'm kinda new to this kind of wireless comms, so be gentle.  :)

Everything will be quite easy to use.  The MC75 basically shows up as  
a "modem" under linux.  You send it some AT commands to place calls,  
send/receive SMS, establish a GPRS link, etc.  For GPRS you then run  
pppd against the connection to the MC75.  For audio, things just show  
up on ALSA devices.

C