diff --git a/dtcInterfaceLib/CFOandDTC_Registers.cpp b/dtcInterfaceLib/CFOandDTC_Registers.cpp
index 790bad1..8560996 100644
--- a/dtcInterfaceLib/CFOandDTC_Registers.cpp
+++ b/dtcInterfaceLib/CFOandDTC_Registers.cpp
@@ -896,7 +896,7 @@ DTCLib::RegisterFormatter DTCLib::CFOandDTC_Registers::FormatJitterAttenuatorCSR
 	form.description = "Jitter Attenuator CSR";
 	form.vals.push_back("<field> : [<value>]"); //first value describes format
 	form.vals.push_back(std::string("JA Source Clock Select: [") + 
-		(JAinputSelect.to_ulong() == 0 ? "from CFO"
+		(JAinputSelect.to_ulong() == 0 ? "from emulated CFO"
 	             : (JAinputSelect.to_ulong() == 1 ? "from RJ45"
 	                         : "Timing Card Selectable (SFP+ or FPGA) Input Clock")) + "]");	
 	form.vals.push_back(std::string("JA in Reset:   [") + (data[0] ? "YES" : "No") + "]");
diff --git a/dtcInterfaceLib/DTC_Registers.cpp b/dtcInterfaceLib/DTC_Registers.cpp
index 0caade9..b00be50 100644
--- a/dtcInterfaceLib/DTC_Registers.cpp
+++ b/dtcInterfaceLib/DTC_Registers.cpp
@@ -3723,7 +3723,7 @@ void DTCLib::DTC_Registers::SetCFO40MHzClockMarkerEnable(DTC_Link_ID const& link
 	std::bitset<32> data = ReadRegister_(DTC_Register_CFOMarkerEnables);
 	if (link == DTC_Link_ALL)
 	{
-		for (uint8_t i = 0; i < 8; ++i)
+		for (uint8_t i = 0; i < 6; ++i) //just ROC links
 			data[i] = enable;
 	}
 	else
diff --git a/dtcInterfaceLib/mu2edev.cpp b/dtcInterfaceLib/mu2edev.cpp
index 64962da..3a193e3 100644
--- a/dtcInterfaceLib/mu2edev.cpp
+++ b/dtcInterfaceLib/mu2edev.cpp
@@ -88,6 +88,30 @@ int mu2edev::init(DTCLib::DTC_SimMode simMode, int deviceIndex, std::string simM
 	return simMode;
 }
 
+//==============================================================================
+// exec
+//	run linux command and get result back in string
+std::string exec(const char* cmd)
+{
+	__COUTV__(cmd);
+
+	std::array<char, 128> buffer;
+	std::string           result;
+	std::shared_ptr<FILE> pipe(popen(cmd, "r"), pclose);
+	if(!pipe)
+	{
+		__COUT_ERR__ << "popen() failed!" << __E__;
+		return "popen() failed!";
+	}
+	while(!feof(pipe.get()))
+	{
+		if(fgets(buffer.data(), 128, pipe.get()) != nullptr)
+			result += buffer.data();
+	}
+	//__COUTV__(result);
+	return result;
+}  // end exec()
+
 /*****************************
    initDMAEngine
    set up DMA engines
@@ -111,7 +135,9 @@ void mu2edev::initDMAEngine()
 		__SS__ << "mu2e Device file not found (or DTCLIB_SIM_ENABLE not set)! Exiting.\n" << 
 			"Attempt to open '" << devfile << "' and received error: " << errno << " - " <<
 			strerror(errno) << __E__;		
-		perror(ss.str().c_str());
+		
+		ss << "Who owns it?\n" << exec("ls -l /dev/mu2e*") << __E__;
+		perror(ss.str().c_str());		
 		__SS_THROW__;
 		// exit(1);
 	}