dev-arm: Gicv3.gicv4 parameter set to False by default

GICv4 features are not currently implemented so it is more natural
to set it to false by default

VExpress_GEM5_V2 platform assumes a GICv4 memory map therefore
sets it to True

Change-Id: Ib4bd17acd56cd029aacf5578ab0259a6ea1bb30c
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/59390
Tested-by: kokoro <noreply+kokoro@google.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>

src/dev/arm/Gic.py

@@ -283,7 +283,7 @@ class Gicv3(BaseGic):
         "Maximum number of PE. This is affecting the maximum number of "
         "redistributors")
 
-    gicv4 = Param.Bool(True, "GICv4 extension available")
+    gicv4 = Param.Bool(False, "GIC is GICv4 compatible")
 
     def interruptCells(self, int_type, int_num, int_trigger, partition=None):
         """

src/dev/arm/RealView.py

@@ -1378,6 +1378,7 @@ class VExpress_GEM5_V1_HDLcd(VExpress_GEM5_V1_Base):
 class VExpress_GEM5_V2_Base(VExpress_GEM5_Base):
     gic = Gicv3(dist_addr=0x2c000000, redist_addr=0x2c010000,
                 maint_int=ArmPPI(num=25),
+                gicv4=True,
                 its=Gicv3Its(pio_addr=0x2e010000))
 
     # Limiting to 128 since it will otherwise overlap with PCI space