Re: [Discuss-gnuradio] Raspberry Pi Activity?

[Ed Criscuolo]

On 1/17/13 10:35 AM, Philip Balister wrote:
> On 01/17/2013 08:57 AM, Ed Criscuolo wrote:
> > Has anyone been using Gnu Radio on a Raspberry Pi lately? (just got one for 
> > Xmas :) )  Any special build procedures for 3.6.3?
>
> Please remember the R-pi is an armv6 based processor with a vfp unit
> (not a NEON SIMD unit). Do not expect much signal processing performance
> from this.
>
> Armv7 + NEON is much better.
>
> Philip

I thought it has an Arm11!  From Wikipedia:

"The Raspberry Pi has a Broadcom BCM2835 system on a chip (SoC),[3] 
which includes an ARM1176JZF-S 700 MHz processor.... VideoCore IV 
GPU,[12] and originally shipped with 256 megabytes of RAM, later 
upgraded to 512MB."

Wikipedia also states:

"ARM11 is an ARM architecture 32-bit RISC microprocessor family which 
introduced the ARMv6 architectural additions. These include SIMD media 
instructions, multiprocessor support and a new cache architecture."

These would seem to imply that the R-Pi has SIMD instructions available.

In addition, the VideoCore IV GPU looks like it's a pretty capable
DSP in it's own, capable of running it's own applications without the
CPU.  Sounds like Volk could take advantage of it as well.