Re: [Discuss-gnuradio] Raspberry Pi 3 / Error: selected processor does not support ARM mode

I'm not that familiar wit Raspian, but my impression is that it is
binary compatible with the original Pi, which has no neon support. The
volk code didn't handle this gracefully until recently.

That said, The Pi 3 does support neon and better. For the Pi-3, I'd use
something built to take advantage of the better processor.

Philip

On 05/08/2018 11:08 AM, Brad Hein wrote:
> On a new Raspberry Pi 3, running Raspbian, all apt-get package updates
> loaded, I'm encountering an error compiling gnuradio (branch: master). I
> made one modification from the default source code, and that is the neonasm
> patch to fix a different compile error with a missing instruction on the
> Pi.
>
> Has anybody encountered the ARM mode error mentioned below or know what I
> can do to push past it?
>
>
> $ git diff HEAD~1
> diff --git
> a/kernels/volk/asm/neon/volk_32f_x2_dot_prod_32f_a_neonasm_opts.s
> b/kernels/volk/asm/neon/volk_32f_x2_dot_prod_32f_a_neonasm_opts.s
> index e4002b8..37dcd75 100644
> --- a/kernels/volk/asm/neon/volk_32f_x2_dot_prod_32f_a_neonasm_opts.s
> +++ b/kernels/volk/asm/neon/volk_32f_x2_dot_prod_32f_a_neonasm_opts.s
> @@ -43,7 +43,12 @@ volk_32f_x2_dot_prod_32f_a_neonasm_opts:
> vadd.f32 s15, s15, s13
> vadd.f32 s15, s15, s14
> bls .done @ if vector is multiple of 16 then finish
> - sbfx r11, r1, #2, #1 @ check alignment
> +@ BH
> https://lists.gnu.org/archive/html/discuss-gnuradio/2016-01/msg00234.html
> +@ sbfx r11, r1, #2, #1 @ check alignment
> + mov r11,#0
> + tst r1,#4
> + movne r11,#15
> +# BH END OF PATCH
> rsb r9, r8, r3
> and r11, r11, #3
> mov r6, r1
>
>
>
> $ cat /etc/debian_version
> 8.0
>
>
> $ uname -a
> Linux redwave 4.9.35-v7+ #1014 SMP Fri Jun 30 14:47:43 BST 2017 armv7l
> GNU/Linux
>
> $ gnuradio branch: master (82d0a6b)
> * 82d0a6b -(4 weeks ago) gr-newmod: Pylint fixes in python scripts .
> Swapnil Negi (HEAD, origin/master, origin/HEAD, master)
>
>
>
> Error output follows:
>
> [ 0%] Building C object
> volk/lib/CMakeFiles/volk_obj.dir/volk_machine_neon_hardfp_orc.c.o
> In file included from
> /home/pi/gr/gnuradio/build/volk/lib/volk_machine_neon_hardfp_orc.c:130:0:
> /home/pi/gr/gnuradio/volk/kernels/volk/volk_32fc_s32fc_multiply_32fc.h: In
> function 'volk_32fc_s32fc_multiply_32fc_neon':
> /home/pi/gr/gnuradio/volk/kernels/volk/volk_32fc_s32fc_multiply_32fc.h:282:16:
> warning: unused variable 'cPtr' [-Wunused-variable]
> lv_32fc_t* cPtr = cVector;
> ^
> /tmp/ccWuy8Qj.s: Assembler messages:
> /tmp/ccWuy8Qj.s:7707: Error: selected processor does not support ARM mode
> `rbit r4,r4'
> /tmp/ccWuy8Qj.s:7718: Error: selected processor does not support ARM mode
> `rbit r4,r4'
> /tmp/ccWuy8Qj.s:7725: Error: selected processor does not support ARM mode
> `rbit r4,r4'
> /tmp/ccWuy8Qj.s:7732: Error: selected processor does not support ARM mode
> `rbit r4,r4'
> /tmp/ccWuy8Qj.s:7740: Error: selected processor does not support ARM mode
> `rbit r4,r4'
> /tmp/ccWuy8Qj.s:7747: Error: selected processor does not support ARM mode
> `rbit r4,r4'
> /tmp/ccWuy8Qj.s:7754: Error: selected processor does not support ARM mode
> `rbit r4,r4'
> /tmp/ccWuy8Qj.s:7761: Error: selected processor does not support ARM mode
> `rbit r4,r4'
> /tmp/ccWuy8Qj.s:7789: Error: selected processor does not support ARM mode
> `rbit ip,ip'
> volk/lib/CMakeFiles/volk_obj.dir/build.make:2572: recipe for target
> 'volk/lib/CMakeFiles/volk_obj.dir/volk_machine_neon_hardfp_orc.c.o' failed
> make[2]: ***
> [volk/lib/CMakeFiles/volk_obj.dir/volk_machine_neon_hardfp_orc.c.o] Error 1
> CMakeFiles/Makefile2:178: recipe for target
> 'volk/lib/CMakeFiles/volk_obj.dir/all' failed
> make[1]: *** [volk/lib/CMakeFiles/volk_obj.dir/all] Error 2
> Makefile:160: recipe for target 'all' failed
> make: *** [all] Error 2
>
>
>
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