arch-arm, configs: Treat the bootloader rom as cacheable memory

Prior to this changeset the bootloader rom (instantiated as a
SimpleMemory) in ruby Arm systems was treated as an IO device and it
was fronted by a DMA controller. This changeset moves the bootloader
rom and adds it to the system as another memory with a dedicated
directory controller.

Change-Id: I094fed031cdef7f77a939d94f948d967b349b7e0
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/8741
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Jason Lowe-Power <jason@lowepower.com>

configs/example/fs.py

@@ -152,8 +152,9 @@ def build_test_system(np):
         test_sys.kvm_vm = KvmVM()
 
     if options.ruby:
+        bootmem = getattr(test_sys, 'bootmem', None)
         Ruby.create_system(options, True, test_sys, test_sys.iobus,
-                           test_sys._dma_ports)
+                           test_sys._dma_ports, bootmem)
 
         # Create a seperate clock domain for Ruby
         test_sys.ruby.clk_domain = SrcClockDomain(clock = options.ruby_clock,