Re: [Discuss-gnuradio] GNU Radio on ARM

[Alexandru Csete]

On Sat, Oct 9, 2010 at 2:54 AM, Elvis Dowson <address@hidden> wrote:
> Hi Marcus,
>
> On Oct 9, 2010, at 4:44 AM, Marcus D. Leech wrote:
>
>> Not to be a wet-blanket or anything, but the USRP2 requires 1GiGe.  The
>> PHY/MAC isn't set up to negotiate 100Mbit.  To support
>>  USRP2, you need a 1GiGE interface.  That's part of the reason I went
>> with the Sheeva Plug--it has 1GiGe.  But it doesn't have floating
>>  point :-(
>
> I wasn't aware of that. Perhaps in this special case, the PHY/MAC FPGA
> code could be reprogrammed to operate at 100Mbit, just to make it work with
> the Overo?
>
> If that is sufficient bandwidth would depend upon the application, but it is 
> an
> interesting experiment to try out.

I haven't actually run GNU Radio or connect the USRP to my Gumstix
Overo Fire, but the highest data rate I could sustain over the USB 2.0
or the Ethernet interface using the Tobi expansion board was around
2.5 MBytes/sec. That may be sufficient for the USRP1 using the highest
decimation rates.

> I already got GNU Radio running on the Mac from sources. I also have been
> working on the Gumstix Overo for about 2 years now with OpenEmbedded,
> so it should be interesting just to port it across and run it off the overo.

I noticed that when using the Angstrom online builder
http://www.angstrom-distribution.org/narcissus/
one has the option to include GNU Radio (see under "Additional console
packages"). This will not use the hardware DSP though.

Alex