diff --git a/src/arch/arm/ArmSystem.py b/src/arch/arm/ArmSystem.py
index c509793651..95073f6e87 100644
--- a/src/arch/arm/ArmSystem.py
+++ b/src/arch/arm/ArmSystem.py
@@ -55,6 +55,9 @@ class ArmExtension(ScopedEnum):
 
         # Armv8.2
         'FEAT_SVE',
+        'FEAT_UAO',
+        'FEAT_LVA', # Optional in Armv8.2
+        'FEAT_LPA', # Optional in Armv8.2
 
         # Armv8.4
         'FEAT_SEL2',
@@ -100,8 +103,12 @@ class Armv8(ArmRelease):
 
 class ArmDefaultRelease(Armv8):
     extensions = Armv8.extensions + [
-        'FEAT_SVE', 'FEAT_LSE', 'FEAT_PAN',
-        'FEAT_HPDS', 'FEAT_VMID16', 'FEAT_RDM', 'FEAT_SEL2'
+        # Armv8.1
+        'FEAT_LSE', 'FEAT_PAN', 'FEAT_HPDS', 'FEAT_VMID16', 'FEAT_RDM',
+        # Armv8.2
+        'FEAT_UAO', 'FEAT_LVA', 'FEAT_LPA', 'FEAT_SVE',
+        # Armv8.4
+        'FEAT_SEL2'
     ]
 
 class Armv81(Armv8):
diff --git a/src/arch/arm/isa.cc b/src/arch/arm/isa.cc
index c01d173734..224b90a587 100644
--- a/src/arch/arm/isa.cc
+++ b/src/arch/arm/isa.cc
@@ -458,6 +458,16 @@ ISA::initID64(const ArmISAParams &p)
         miscRegs[MISCREG_ID_AA64MMFR1_EL1], 23, 20,
         release->has(ArmExtension::FEAT_PAN) ? 0x1 : 0x0);
 
+    /** MISCREG_ID_AA64MMFR2_EL1 */
+    // UAO
+    miscRegs[MISCREG_ID_AA64MMFR2_EL1] = insertBits(
+        miscRegs[MISCREG_ID_AA64MMFR2_EL1], 7, 4,
+        release->has(ArmExtension::FEAT_UAO) ? 0x1 : 0x0);
+    // LVA
+    miscRegs[MISCREG_ID_AA64MMFR2_EL1] = insertBits(
+        miscRegs[MISCREG_ID_AA64MMFR2_EL1], 19, 16,
+        release->has(ArmExtension::FEAT_LVA) ? 0x1 : 0x0);
+
 
     // TME
     miscRegs[MISCREG_ID_AA64ISAR0_EL1] = insertBits(
diff --git a/src/arch/arm/system.cc b/src/arch/arm/system.cc
index 4edc35083b..747695f16e 100644
--- a/src/arch/arm/system.cc
+++ b/src/arch/arm/system.cc
@@ -102,7 +102,9 @@ ArmSystem::ArmSystem(const Params &p)
     if (_highestELIs64 && (
             _physAddrRange64 < 32 ||
             _physAddrRange64 > MaxPhysAddrRange ||
-            (_physAddrRange64 % 4 != 0 && _physAddrRange64 != 42))) {
+            (_physAddrRange64 % 4 != 0 && _physAddrRange64 != 42) ||
+            (_physAddrRange64 == 52 && !release->has(ArmExtension::FEAT_LPA))))
+    {
         fatal("Invalid physical address range (%d)\n", _physAddrRange64);
     }
 }