diff --git a/wa/output_processors/cpustates.py b/wa/output_processors/cpustates.py
index 936b1170..9239d755 100755
--- a/wa/output_processors/cpustates.py
+++ b/wa/output_processors/cpustates.py
@@ -94,6 +94,9 @@ class CpuStatesProcessor(OutputProcessor):
         if not trace_file:
             self.logger.warning('Text trace does not appear to have been generated; skipping this iteration.')
             return
+        if 'cpufreq' not in target_info.modules:
+            msg = '"cpufreq" module not detected on target, cpu frequency information may be missing.'
+            self.logger.warning(msg)
 
         self.logger.info('Generating power state reports from trace...')
         reports = report_power_stats(  # pylint: disable=unbalanced-tuple-unpacking
diff --git a/wa/utils/cpustates.py b/wa/utils/cpustates.py
index 632b7e9f..0dc59d5a 100755
--- a/wa/utils/cpustates.py
+++ b/wa/utils/cpustates.py
@@ -560,12 +560,12 @@ class CpuUtilizationTimeline(object):
 
         headers = ['ts'] + ['{} CPU{}'.format(cpu.name, cpu.id) for cpu in cpus]
         self.writer.writerow(headers)
-        self._max_freq_list = [cpu.cpufreq.available_frequencies[-1] for cpu in cpus]
+        self._max_freq_list = [cpu.cpufreq.available_frequencies[-1] for cpu in cpus if cpu.cpufreq.available_frequencies]
 
     def update(self, timestamp, core_states):  # NOQA
         row = [timestamp]
         for core, [_, frequency] in enumerate(core_states):
-            if frequency is not None:
+            if frequency is not None and core in self._max_freq_list:
                 frequency /= float(self._max_freq_list[core])
                 row.append(frequency)
             else: