This is not an officially supported Google product.
This is a super simple Boot ROM that is intended to be used as a -bios image for QEMU when emulating an AST27x0-based machine.
If you have a 64-bit ARM compiler installed as aarch64-linux-gnu-gcc, simply run make.
If your ARM compiler has a different name, you'll need to override the CROSS_COMPILE prefix, e.g. like this:
make CROSS_COMPILE=aarch64-linux-gnueabi-
If either case is successful, a ast27x0_bootrom.bin file will be produced.
The Boot ROM image may be passed to a QEMU system emulator using the -bios option. For example like this:
qemu-system-aarch64 -machine ast2700a1-evb -nographic \
-bios ${IMAGES}/ast27x0_bootrom.bin \
-drive file=${IMAGES}/image-bmc,format=raw,if=mtd \
-snapshot