On Wed, Sep 3, 2014 at 5:53 PM, Philip Balister <phi...@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 > > > > > > > > _______________________________________________ > > Discuss-gnuradio mailing list > > Discuss-gnuradio@gnu.org > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
_______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
