Add generic aarch64 board config and build rules.
Change-Id: I8b4a377596705dfa0a3bd234162d183ec2ae9530
diff --git a/target/board/generic_aarch64/README.txt b/target/board/generic_aarch64/README.txt
new file mode 100644
index 0000000..681c31e
--- /dev/null
+++ b/target/board/generic_aarch64/README.txt
@@ -0,0 +1,5 @@
+The "generic_aarch64" product defines a non-hardware-specific aarch64 target
+without a kernel or bootloader.
+
+It is not a product "base class"; no other products inherit
+from it or use it in any way.