I have a Orange Pi PC, quad core @ 1.6 running Fedora 22.
I've installed boinc-client and boinc-manager

systemctl start boinc-client.service

ps -ef | grep boinc
boinc 15430 1 0 Apr10 ? 00:00:00 /bin/bash /usr/bin/boinc --dir /var/lib/boinc
boinc 15431 15430 1 Apr10 ? 00:07:47 /usr/bin/boinc_client --allow_multiple_clients --dir /var/lib/boinc

Then I ran boincmgr and added a project (einstein) and got the files. But ps doesn't change and nothing seems to be happening. boinccmd --get_tasks returns nothing - it's as if I'm talking to my teenage kid.
Ideas???
Tks

Then I ran boincmgr and added a project (einstein) and got the files.

Which files did you get?
Actual science applications and tasks, or just the bunch of JPEG images used in Simple View?

Best check the event log (CTRL+SHIFT+E on BOINC Manager) or if that doesn't work for some reason, the stdoutdae.txt file in your data directory.

Why though do you feel the need to run with multiple BOINC clients?
It won't speed anything up, more slow things down, plus it can create havoc.
If you feel that your 4 cores aren't used, that can be set in the preferences.

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Think I've found the problem. In "Notices":
"This project doesn't support computer
of type armv7hl-pc-linux-gnu".

Any why not?

The project may not have this type of application. Projects don't develop applications for every possible operating system under the sun, they cannot afford to do so.

But you best ask why they don't have this application available in their forums. (Pointing to forums where you can post without a RAC > 1, in case you don't have credit for them yet).

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Most or all projects with Raspberry Pi compatible hard-float apps use arm-unknown-linux-gnueabihf as platform name.

If your system is hard-float compatible create or edit cc_config.xml file in BOINC's data directory and put the following in it:

<cc_config>
  <options> 
    <alt_platform>arm-unknown-linux-gnueabihf</alt_platform> 
  </options>
</cc_config>

You likely need to restart BOINC for this setting to take effect.