Mentor Graphics is adding support for AArch64 and AMD x86 in their freeware eLinux toolchains:
Mentor Embedded Linux for AMD x86 G-Series and R-Series Processors and Sourcery CodeBench Tools for AMD x86 and ARM
Linux Development for Next-Generation Embedded Systems
Mentor Embedded and AMD have joined forces to announce several software enablement products for the AMD Embedded G-Series and R-Series families of processors: Mentor Embedded Linux and Sourcery CodeBench IDE tools. To complement the offer, free versions of the Mentor Embedded Linux-Lite and Sourcery CodeBench Lite are available for customers to download. The combination of AMD’s breadth of embedded processors and Mentor Embedded’s software solutions will enable developers to build robust and powerful applications in industries such as digital gaming, industrial control & automation, retail Point-of-Sale (POS), networking equipment and storage.
http://www.mentor.com/company/news/mentor-amd-armv8-a-linux
Firmware Security 