Cavium's ThunderX platform is the primary reference target for the FreeBSD/arm64 port.
The standard bsdinstall instructions apply to ThunderX. Support was introduced as of FreeBSD 11.0-ALPHA5. Note that only available installation media is memstick (no cd, dvd, etc.).
It is recommended that a USB 3.0 flash stick be used.
Some or all UEFI firmware versions have a bug where the USB flash stick may not boot after cold start. If this occurs perform a warm reset and the system should then boot properly. Wiki page to be updated with specific version information once there is a confirmed fix.
A USB network adapter must be installed in the bottom USB slot. The top slot is connected to the BMC.