Re: [Discuss-gnuradio] ZedBoard GNU Radio image boot problems

On Wed, Sep 3, 2014 at 5:53 PM, Philip Balister <philip@balister.org> wrote:

On 09/03/2014 04:30 PM, Nowlan, Sean wrote:
> I'm trying to boot a ZedBoard with the GNU Radio image here: http://gnuradio.org/data/sdk/zedboard_armv7a-hf-vfp-neon/. I picked the hard float image even though the tutorial points to the soft float image (http://gnuradio.org/redmine/projects/gnuradio/wiki/Zynq). I don't know why I'd want the soft float image since using the FPU will be much faster.
>

Hard float isn't that much faster. It referes to the ARM abi used for
function calls. Hard float lets you return floats in NEON registers,
which makes functions that return floats faster. Pretty much everything
else is the same. So, it is a win, but not huge, except for certain cases.

Philip

Nathan and I have both done some tests. You can get a few percent improvement in speed with just hard float. That by itself was not a compelling enough reason to drop the ORC support. It was only because of the NEON VOLK proto-kernels that made the change worth it.

I had some data that I was going to publish at one point, but it was too confused with different development stages so that the comparisons wouldn't be clean or clear.

Tom

 

> I followed the directions at the aforementioned tutorial except I renamed "u-boot.bin" to "BOOT.BIN" and "uImage-zedboard-zynq7.dtb" to "devicetree.dtb". I could not get the board to boot. The USB-to-UART triggers cdc_acm to load /dev/ttyACM0 on my Linux host PC, but there is no activity over serial. I'm confident the board is not dead because I am able to boot from the preloaded SD card that came with the ZedBoard development kit. Does anybody have any suggestions? It seems like either some step is missing or I am misunderstanding a step in the tutorial.
>
> Thanks,
> Sean Nowlan
>
>
>

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