start simple integration to test dp650

Not yet merged on gem5 mailine, review published at:
https://gem5-review.googlesource.com/c/public/gem5/+/11036/1

Author: cirosantilli

README.adoc

@@ -3560,6 +3560,7 @@ Tested on: link:http://github.com/cirosantilli/linux-kernel-module-cheat/commit/
 For `aarch64` we also need to configure the kernel with link:linux_config/display[]:
 
 ....
+git -C "$(./getvar linux_src_dir)" fetch https://gem5.googlesource.com/arm/linux gem5/v4.15:gem5/v4.15
 git -C "$(./getvar linux_src_dir)" checkout gem5/v4.15
 ./build-linux \
   --arch aarch64 \

common.py

@@ -305,6 +305,9 @@ def get_argparse(default_args=None, argparse_args=None):
 Use the docker download Ubuntu root filesystem instead of the default Buildroot one.
 '''
     )
+    parser.add_argument(
+        '--dp650', default=False, action='store_true'
+    )
     parser.add_argument(
         '-L', '--linux-build-id', default=default_build_id,
         help='Linux build ID. Allows you to keep multiple separate Linux builds. Default: %(default)s'
@@ -737,12 +740,6 @@ def setup(parser):
         common.buildroot_toolchain_prefix = 'arm-buildroot-linux-uclibcgnueabihf'
         common.crosstool_ng_toolchain_prefix = 'arm-unknown-eabi'
         common.ubuntu_toolchain_prefix = 'arm-linux-gnueabihf'
-        if common.emulator == 'gem5':
-            if common.machine is None:
-                common.machine = 'VExpress_GEM5_V1'
-        else:
-            if common.machine is None:
-                common.machine = 'virt'
         common.is_arm = True
     elif args.arch == 'aarch64':
         common.armv = 8
@@ -751,12 +748,6 @@ def setup(parser):
         common.buildroot_toolchain_prefix = 'aarch64-buildroot-linux-uclibc'
         common.crosstool_ng_toolchain_prefix = 'aarch64-unknown-elf'
         common.ubuntu_toolchain_prefix = 'aarch64-linux-gnu'
-        if common.emulator == 'gem5':
-            if common.machine is None:
-                common.machine = 'VExpress_GEM5_V1'
-        else:
-            if common.machine is None:
-                common.machine = 'virt'
         common.is_arm = True
     elif args.arch == 'x86_64':
         common.crosstool_ng_toolchain_prefix = 'x86_64-unknown-elf'
@@ -769,6 +760,16 @@ def setup(parser):
         else:
             if common.machine is None:
                 common.machine = 'pc'
+    if is_arm:
+        if common.emulator == 'gem5':
+            if common.machine is None:
+                if args.dp650:
+                    common.machine = 'VExpress_GEM5_V1_DPU'
+                else:
+                    common.machine = 'VExpress_GEM5_V1'
+        else:
+            if common.machine is None:
+                common.machine = 'virt'
     common.buildroot_out_dir = os.path.join(common.out_dir, 'buildroot')
     common.buildroot_build_dir = os.path.join(common.buildroot_out_dir, 'build', args.buildroot_build_id, args.arch)
     common.buildroot_download_dir = os.path.join(common.buildroot_out_dir, 'download')

run

@@ -192,11 +192,15 @@ def main(args, extra_args=None):
                 elif common.is_arm:
                     if args.kvm:
                         cmd.extend(['--cpu-type', 'ArmV8KvmCPU', common.Newline])
+                    if args.dp650:
+                        dp650_cmd = 'dpu_'
+                    else:
+                        dp650_cmd = ''
                     cmd.extend([
                         # TODO why is it mandatory to pass mem= here? Not true for QEMU.
                         # Anything smaller than physical blows up as expected, but why can't it auto-detect the right value?
                         '--command-line', 'earlyprintk=pl011,0x1c090000 lpj=19988480 rw loglevel=8 mem={} root=/dev/sda {}'.format(memory, kernel_cli), common.Newline,
-                        '--dtb-filename', os.path.join(common.gem5_system_dir, 'arm', 'dt', 'armv{}_gem5_v1_{}cpu.dtb'.format(common.armv, args.cpus)), common.Newline,
+                        '--dtb-filename', os.path.join(common.gem5_system_dir, 'arm', 'dt', 'armv{}_gem5_v1_{}{}cpu.dtb'.format(common.armv, dp650_cmd, args.cpus)), common.Newline,
                         '--machine-type', common.machine, common.Newline,
                     ])
                     if common.baremetal is None: