Bootup test tuned also for RPi

tests/test_protect_call.py

@@ -53,15 +53,17 @@ class TestProtectCall(common.TrezorTest):
         self.client.close()
 
         # Give it some time to reboot (it may take some time on RPi)
-        boot_delay = 5
-        start = time.time()
+        boot_delay = 20
         time.sleep(boot_delay)
 
         # Connect to Trezor again
+        start = time.time()
         self.setUp()
-        print "Expected reboot time %s seconds" % (1.8 ** attempt)
-        print "Rebooted in %s seconds" % (time.time() - start)
-        self.assertLessEqual(1.8 ** attempt, time.time() - start, "Bootup took less than expected!")
+        expected = 1.8 ** attempt / 2  # This test isn't accurate, let's expect at least some delay
+        took = time.time() - start
+        print "Expected reboot time at least %s seconds" % expected
+        print "Rebooted in %s seconds" % took
+        self.assertLessEqual(expected, time.time() - start, "Bootup took %s seconds, expected %s seconds or more!" % (took, expected))
 
 if __name__ == '__main__':
     unittest.main()