Are there any breadboard-style releases implementing this spec? I'm looking for the low(er) cost and open ecosystem that I find in ODROID and RasPi style boards, but still the robustness and standardization of this common spec.
There's a new development board coming real soon that will implement it. It is also implemented by the firmware on APM X-Gene (Mustang) and HP Moonshot. Not sure about Cavium as I've not used it.
However it's unlikely you'll find a small format SBSA-compliant board any time soon, because the server stack simply assumes a lot more RAM than is available on phone/tablet SoCs. For example, the minimum RAM required to run RHEL/aarch64 is 1 GB/pCPU (so in reality 4-8GB min), and even the Snapdragon 808 only has 3 GB. I personally wouldn't be happy doing development work for 64 bit ARM SBSA with less than 8 GB of RAM, and for OpenStack, 32 GB is the minimum I'd recommend.
(I do run Fedora/aarch64 on my LG G4 phone though :-)
