Arm compilations give a "Illegal instruction" on a Raspberry Pi 2

[jdevora]

I have a Raspberry Pi 2 running Raspbian

My understating is that I should be able to run the ARM 32 bits compilation on it.

I follow those steps but at the end it will throw an Illegal Instruction error.

$ wget https://bitcoin.org/bin/bitcoin-core-0.13.0/SHA256SUMS.asc
$ wget https://bitcoin.org/bin/bitcoin-core-0.13.0/bitcoin-0.13.0-arm-linux-gnueabihf.tar.gz
$ sha256sum bitcoin-0.13.0-arm-linux-gnueabihf.tar.gz|grep -f SHA256SUMS.asc
  7c657ec6f6a5dbb93b9394da510d5dff8dd461df8b80a9410f994bc53c876303  bitcoin-0.13.0-arm-linux-gnueabihf.tar.gz
$ tar -zxf bitcoin-0.13.0-arm-linux-gnueabihf.tar.gz
$ bitcoin-0.13.0/bin/bitcoind
  Illegal instruction

$ lsb_release -a
 No LSB modules are available.
 Distributor ID: Raspbian
 Description:    Raspbian GNU/Linux 8.0 (jessie)
 Release:        8.0
 Codename:       jessie
$ uname -a
 Linux raspberrypi 4.1.7+ #817 PREEMPT Sat Sep 19 15:25:36 BST 2015 armv6l GNU/Linux

Was it never intended to work on a Raspberry Pi 2 or is there something missing on my part or at the compilation options?

[mruddy]

Quick question, are you sure that you're using a Raspberry Pi 2 Model B and not a Raspberry Pi Model B+? https://www.element14.com/community/docs/DOC-78141/l/identifying-your-model-of-raspberry-pi

Your uname output shows armv6l and not armv7l. Raspberry Pi 1 used ARMv6.

What does this show you: egrep -i 'model|hardware' /proc/cpuinfo?

EDIT: @jdevora Also, maybe it's possible that you are using a Pi 2 and running a Raspbian that is built to target ARMv6 and that is causing your problem. I'm sure that the bitcoind binary is targeting ARMv7-A:

readelf -A bitcoin-0.13.0/bin/bitcoind | egrep -i 'cpu_name|cpu_arch'
Tag_CPU_name: "7-A"
Tag_CPU_arch: v7
Tag_CPU_arch_profile: Application

[jdevora]

Sorry, my mistake, I inserted the SD card in my Pi B+ instead of the Pi 2.

[laanwj]

Yes, the binary targets ARMv7. Should arguably have mentioned that in the release notes. It is also news to me that RPI1 was only ARMv6.

[mruddy]

@laanwj we could add a quick note to the 0.13.0 and/or 0.13.1 release notes. Something about the binaries being built for ARMv7-A and thus being able to be run on platforms backwards compatible to that architecture. I know we probably don't want to list all the products that might work, but giving the example of RasPi 2 & 3 vs RasPi 1 would probably be helpful to people.

[laanwj]

@mruddy Yes, that'd be a good idea