diff --git a/misc/config_tools/board_inspector/board_inspector.py b/misc/config_tools/board_inspector/board_inspector.py
index 41067d12b..b6cffb885 100755
--- a/misc/config_tools/board_inspector/board_inspector.py
+++ b/misc/config_tools/board_inspector/board_inspector.py
@@ -11,7 +11,7 @@ import subprocess # nosec
 import lxml.etree
 import argparse
 from importlib import import_module
-from cpuparser import parse_cpuid, get_online_cpu_ids
+from cpuparser import parse_cpuid, get_online_cpu_ids, get_offline_cpu_ids
 
 script_dir = os.path.dirname(os.path.realpath(__file__))
 sys.path.append(os.path.join(script_dir))
@@ -48,6 +48,15 @@ def native_check():
         logging.warning(f"Board inspector is running inside a Virtual Machine (VM). Running ACRN inside a VM is only" \
         "supported under KVM/QEMU. Unexpected results may occur when deviating from that combination.")
 
+def bring_up_cores():
+    cpu_ids = get_offline_cpu_ids()
+    for id in cpu_ids:
+        try:
+            with open("/sys/devices/system/cpu/cpu{}/online".format(id), "w") as f:
+                f.write("1")
+        except :
+            logging.warning("Cannot bring up core with cpu id {}.".format(id))
+
 def main(board_name, board_xml, args):
     # Check that the dependencies are met
     check_deps()
@@ -55,6 +64,9 @@ def main(board_name, board_xml, args):
     # Check if this is native os
     native_check()
 
+    # Bring up all cores
+    bring_up_cores()
+
     try:
         # First invoke the legacy board parser to create the board XML ...
         legacy_parser = os.path.join(script_dir, "legacy", "board_parser.py")
diff --git a/misc/config_tools/board_inspector/cpuparser/__init__.py b/misc/config_tools/board_inspector/cpuparser/__init__.py
index 897bfd98c..0d0e2148d 100644
--- a/misc/config_tools/board_inspector/cpuparser/__init__.py
+++ b/misc/config_tools/board_inspector/cpuparser/__init__.py
@@ -60,14 +60,21 @@ def parse_cpuid(leaf, subleaf, cpu_id):
     else:
         return None
 
-def get_online_cpu_ids():
+def parse_cpu_ids(file):
     acc = list()
-    with open("/sys/devices/system/cpu/online", "r") as f:
+    with open(file, "r") as f:
         line = f.read().strip()
         for r in line.split(","):
             if r.find("-") > 0:
                 first, last = tuple(map(int, r.split("-")))
                 acc.extend(range(first, last + 1))
             else:
-                acc.append(int(r))
+                if r:
+                    acc.append(int(r))
     return acc
+
+def get_online_cpu_ids():
+    return parse_cpu_ids("/sys/devices/system/cpu/online")
+
+def get_offline_cpu_ids():
+    return parse_cpu_ids("/sys/devices/system/cpu/offline")