Fatal source exception in loopback sample on powerpc/qoriq_e6500_64

[Clukey (US), Steven A]

Thanks! I had missed that. I've gotten libbsd compiled/linked and now I can run a loopback test

A question though: if RTEMS_NETWORKING doesn't work on the 64-bit targets, why does it compile? Could the `--enable-networking` configure option be removed or marked as an error on the targets that it doesn't support?