From Fedora Project Wiki

Fedora 21 AArch64 Hardware Support Matrix

Hardware Firmware Kernel Version Console Network 10G Network SATA DVD USB PCI-E Notes
Applied Micro X-Gene (Mustang)
none
none
none
none
none
none
Advanced Micro Devices Opteron A1100 (aka Seattle)
none
none
none
none
none
none

Applied Micro X-Gene (Mustang)

Kernel Firmware Console Network 10G Network SATA DVD USB PCI-E Virt Notes
kernel-3.17.4-302.fc21
none
none
none
none
none
none
none
kernel-3.18.0-1.fc22
none
none
none
none
none
none
none