Managed to update the Hikey ARM64 SoC to the latest kernel – 4.7 Final.
Fedora 24 (Twenty Four) Kernel 4.7.0 on an aarch64 (ttyAMA0) ............................ # uname -a Linux rghikey 4.7.0 #1 SMP PREEMPT Sun Jul 24 19:53:54 EDT 2016 aarch64 aarch64 aarch64 GNU/Linux
On boot, and when the network initialised, polkitd segfaulted again, the same as when I booted a version of 4.7-next..http://rglinuxtech.com/?p=1767 After a bit of research, I found that this was a userland problem with mozjs17 on ARM64: https://lists.fedoraproject.org/pipermail/arm/2015-July/009639.html
As this had not been fixed for over a year, I went ahead and applied the patch to the latest mozjs17 source rpm, and rebuilt/updated, and the problem has gone away..
So.. this is (so far..) the only ARM64 device I have that works (headless..) with the mainstream Linux kernel..
Robert Gadsdon. July 25, 2016.