update REAME.txt (for new boxes MLZ type)

README.md

@@ -11,7 +11,7 @@ to_system/  contains the files to be installed in the system
 filename: servercfg/(hostname)_(hexdigits).cfg
 
   * (hostname) the hostname to be given on startup
-  * (hexdigits) the last six digits of one of the ethernet adresses of the interfaces on the APU
+  * (hexdigits) the last six digits of the ethernet adress of the first interface on the APU (leftmost plug)
 
 content of the config files:
 
@@ -30,11 +30,19 @@ enp4s0=dhcp              # rightmost socket is the uplink
 [FRAPPY]
 cfg=uniax   # the cfg file for the frappy server
 port=5000   # the port for the frappy server
+
+[DISPLAY]
+startup_text=startup...|HOST|ADDR   # startup text, 3 lines separated with |
 ```
 
 ## network configuration
 
-The example above fits the most cases. Here a detailed description of possible settings:
+The example above fits the most cases.
+Remark: as the control boxes form munich are labelled with 'eth0' etc.,
+the names might be given in this form. internally the more modern names like 'enp1s0'
+are used.
+
+Here a detailed description of possible settings:
 
 ### fixed IP
 ```
@@ -72,5 +80,9 @@ Must not overlap networks specified for other ports!
 enp3s0=off             # disabled
 ```
 
+## display
+
+available on control boxes (MLZ type) only. must therefore not be present on bare apu boxes.
+