mpm: n3xx: Don't set time and clock source without dboards

When there are no daughterboards present, clock and time source are
meaningless. It's also possible that corresponding FPGA images are not
loaded, in which case trying to set those could crash the system. Unless
daughterboards are actually present, these settings won't get applied
any more.

1 files changed, 14 insertions, 6 deletions

diff --git a/mpm/python/usrp_mpm/periph_manager/n310.py b/mpm/python/usrp_mpm/periph_manager/n310.py
index c36de555c..a9c8076ca 100644
--- a/mpm/python/usrp_mpm/periph_manager/n310.py
+++ b/mpm/python/usrp_mpm/periph_manager/n310.py
@@ -229,12 +229,20 @@ class n310(PeriphManagerBase):
         self._ext_clock_freq = float(
             default_args.get('ext_clock_freq', N3XX_DEFAULT_EXT_CLOCK_FREQ)
         )
-        self.set_clock_source(
-            default_args.get('clock_source', N3XX_DEFAULT_CLOCK_SOURCE)
-        )
-        self.set_time_source(
-            default_args.get('time_source', N3XX_DEFAULT_TIME_SOURCE)
-        )
+        if len(self.dboards) == 0:
+            self.log.warning(
+                "No dboards found, skipping setting clock and time source " \
+                "configuration."
+            )
+            self._clock_source = N3XX_DEFAULT_CLOCK_SOURCE
+            self._time_source = N3XX_DEFAULT_TIME_SOURCE
+        else:
+            self.set_clock_source(
+                default_args.get('clock_source', N3XX_DEFAULT_CLOCK_SOURCE)
+            )
+            self.set_time_source(
+                default_args.get('time_source', N3XX_DEFAULT_TIME_SOURCE)
+            )
 
     def init(self, args):
         """