Re: [Discuss-gnuradio] Crosscompile Gnuradio for Rpi

[Nate Temple]

Hi Matej,

I've had success with the following command compiling gnuradio on another 
raspberry pi like ARM based board, I believe it will get you past the NEON / 
ASM errors. This command was taken from the gnuradio embedded page [1]

cmake -DCMAKE_C_FLAGS="-march=armv7-a -mthumb-interwork -mfloat-abi=hard 
-mfpu=neon -mtune=cortex-a9" -DCMAKE_ASM_FLAGS="-march=armv7-a 
-mthumb-interwork -mfloat-abi=hard -mfpu=neon" ../

You will need to add an external swap as others have suggested in this thread, 
or it will most likely fail part way though the compile. The RBPI Model B (v1) 
is going to take quite a while to compile Gnuradio. 

You might want to check out these other Raspberry pi type boards, the Odroid 
XU4 or C1+ [2,3,4]. Both have gigabit and are considerably more powerful than 
the Rbpi v1 (and v2).  Another option might be to use an Intel NUC which is 
available with various processor configurations. I have an Odroid C1 I can test 
with a N series and will report back my findings to this thread.

[1] https://gnuradio.org/redmine/projects/gnuradio/wiki/Embedded
[2] http://www.hardkernel.com/main/main.php
[3] http://ameridroid.com/products/odroid-c1
[4] http://ameridroid.com/products/odroid-xu4

- Nate

> On Jan 14, 2016, at 2:46 AM, Matej Kovacic <address@hidden> wrote:
> 
> Hi,
> 
>> You could just watch a movie or something and build natively on the PI.
>> Just be careful of memory constraints. Maybe a -j 1 or a USB drive
>> mounted as swap would be a good idea.
> 
> In fact that would be probably the best solution for my level of
> knowkedge. However, compiling GNURadio on RPi also doesn't work.
> 
> Here is the problem:
> 
> I say:
> cmake ..
> 
> and then make, and got this error:
> 
> [  2%] Building ASM object
> volk/lib/CMakeFiles/volk_obj.dir/__/kernels/volk/asm/neon/volk_32f_x2_dot_prod_32f_neonasm_opts.s.o
> /home/pi/gnuradio/gnuradio-3.7.9/volk/kernels/volk/asm/neon/volk_32f_x2_dot_prod_32f_neonasm_opts.s:
> Assembler messages:
> /home/pi/gnuradio/gnuradio-3.7.9/volk/kernels/volk/asm/neon/volk_32f_x2_dot_prod_32f_neonasm_opts.s:46:
> Error: selected processor does not support ARM mode `sbfx r11,r1,#2,#1'
> volk/lib/CMakeFiles/volk_obj.dir/build.make:1479: recipe for target
> 'volk/lib/CMakeFiles/volk_obj.dir/__/kernels/volk/asm/neon/volk_32f_x2_dot_prod_32f_neonasm_opts.s.o'
> failed
> make[2]: ***
> [volk/lib/CMakeFiles/volk_obj.dir/__/kernels/volk/asm/neon/volk_32f_x2_dot_prod_32f_neonasm_opts.s.o]
> Error 1
> CMakeFiles/Makefile2:233: recipe for target
> 'volk/lib/CMakeFiles/volk_obj.dir/all' failed
> make[1]: *** [volk/lib/CMakeFiles/volk_obj.dir/all] Error 2
> Makefile:147: recipe for target 'all' failed
> make: *** [all] Error 2
> 
> 
> Please note: this is compiling ON RPi.
> 
> Regards,
> 
> Matej
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