Note that for some odd reason qemu-system-aarch64 needs to be explicitly
told to use a 64-bit CPU or it will boot in 32-bit mode.
+Additional persistent U-boot environment support can be added as follows:
+- Create envstore.img using qemu-img:
+ qemu-img create -f raw envstore.img 64M
+- Add a pflash drive parameter to the command line:
+ -drive if=pflash,format=raw,index=1,file=envstore.img
+
Additional peripherals that have been tested to work in both U-Boot and Linux
can be enabled with the following command line parameters: