Hello, 
I just wanted to know does ptp4l support a BC in software as i try'ed to 
make one but it fails on opening the ptp device
which it shouldn't even try to open as the devices are set to software 
timestamping only. 

The failure is simply:
```
Switching PHC, failed to open /dev/ptp-1: No such a file or directory
port 1: UNVALIBRATED to FAULT on FAULT_DETECTED (FT_SWITCH_PHC)
```
On the other port i get this failure:
```
port 2: send peer delay request failed 
port 2: LISTENING to FAULTY on FAULT_DETECTED (FT_UNSPECIFIED)
timed out while polling for tx timestamp
```

My config is this:

```
[global]
boundary_clock_jbod     1
network_transport       L2
delay_mechanism P2P
timestamping            software
tx_timestamp_timeout    100

use_syslog              0
verbose                 1

[enp5s0]
[enp4s0]
```

This fault happens only at the interface 5 where the GM/Hirschman EES20 is 
connected. 
If i change the connection to the other port same failure on interface 4. 

The card is a PLX technology E189948 dual mac it doesn't have HW 
timestamping implmented so thats why we use software.
We also try'ed it on another device with two interfaces and it did also 
not work. 

Both ports are connected and there links are up.
One side connected to a GM (int5) and the other to a OC/SC (int4) 

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