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+====== GnuRadio, Volk and RaspberryPi 2 ======
+Currently, package raspi-copies-and-fills breaks stuff for ARMv7! Remove it, or udevd, getty and others won't work!
+  * https://github.com/systemd/systemd/issues/8991
+  * https://raspberrypi.stackexchange.com/questions/72594/failed-to-start-udev-kernel-device-manager
+  * https://bugs.launchpad.net/raspbian/+bug/1779563
+  * https://bugs.launchpad.net/raspbian/+bug/1573473
+===== gnuradio/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' =====
+No, it does. You have broken compiler.
+Currently, the same Raspbian is distributed for ARMv6 RaspberryPi 1 and ARMv7 RaspberryPi 2. This means that all packages are compiled --with-arch=armv6 --with-fpu=vfp. However, this also means, that gcc assembler does not support some NEON instructions even when --mfpu=neon is set (no idea why).
+You need gcc compiled with --with-arch=armv7-a --with-fpu=vfpv3-d16. For example from stock armhf Debian.
+I have edited /etc/apt/sources.list so now it reads:
+<code>
+deb http://merlin.fit.vutbr.cz/debian/ jessie main contrib non-free
+deb-src http://merlin.fit.vutbr.cz/debian/ jessie main
+deb http://security.debian.org/ jessie/updates main
+deb http://merlin.fit.vutbr.cz/debian/ jessie-updates main
+</code>
+(of course pick a mirror that is in your network)
+Maybe you should also change /etc/apt/sources.list.d/raspi.list to get Jessie.
+apt-get update, apt-get install debian-archive-keyring, apt-get update
+apt-get dist-upgrade, apt-get install gcc-4.9 gcc-4.9-base libgcc-4.9-dev libgcc1 gcc
+(oh and dpkg -l | grep gcc and remove old gccs)
+Continue with [[:gnuradio]].