arch-arm, configs: Create single instance of DTB autogeneration

This patch is rewriting the DTB autogeneration functions available in
fs_bigLITTLE.py and fs.py as a single method in the GenericArmSystem
so that other configuration scripts can make use of it.

Change-Id: I492bbf77e6b0ac5c5fbdbc75c0eecba29bd63bda
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/15958
Reviewed-by: Ciro Santilli <ciro.santilli@arm.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/src/arch/arm/ArmSystem.py b/src/arch/arm/ArmSystem.py
index bee38a41c..98ff95918 100644
--- a/src/arch/arm/ArmSystem.py
+++ b/src/arch/arm/ArmSystem.py
@@ -37,6 +37,7 @@
 #          Glenn Bergmans
 
 from m5.params import *
+from m5.options import *
 from m5.SimObject import *
 from m5.util.fdthelper import *
 
@@ -138,6 +139,19 @@ class GenericArmSystem(ArmSystem):
     panic_on_oops = Param.Bool(False, "Trigger a gem5 panic if the " \
                                    "guest kernel oopses")
 
+    def generateDtb(self, outdir, filename):
+        """
+        Autogenerate DTB. Arguments are the folder where the DTB
+        will be stored, and the name of the DTB file.
+        """
+        state = FdtState(addr_cells=2, size_cells=2, cpu_cells=1)
+        rootNode = self.generateDeviceTree(state)
+
+        fdt = Fdt()
+        fdt.add_rootnode(rootNode)
+        dtb_filename = os.path.join(outdir, filename)
+        self.dtb_filename = fdt.writeDtbFile(dtb_filename)
+
 class LinuxArmSystem(GenericArmSystem):
     type = 'LinuxArmSystem'
     cxx_header = "arch/arm/linux/system.hh"