
MOTOROLA
Appendix G. Networking Support
G-3
Troubleshooting Hints
No login is required. The initial prompt is ‘DINK32-TELNET >>’
To close the connection gracefully, disconnect from client Telnet window.
There are several ways to redirect console back to serial port.
1. Delete NETIO environment variable from the Telnet console. Reset/Power cycle
Sandpoint.
2. Holding down backspace key while DINK is booting. This should allow DINK to
bypass all the environment variable settings and use the default serial console.
3. Remove Ethernet NIC from the PCI slot before booting DINK. This would cause
DINK to fail to discover Ethernet hardware support for Telnet, therefore switching
to serial console.
G.1
Troubleshooting Hints
Problem 1. Connection lost after about a minute.
Solution: If you are using Windows based host, this is due to the TCP keep alive signal sent
by Windows host to check if DINK connection is still alive. However, DINK will not
respond to this keep-alive polling, (starting with an ARP request). The reason for that is
DINK TCP/IP is designed to be purely based on polling such that when running a
benchmark via a network, there will be no unpredictable performance impact. The work
around is to disable Windows keep alive polling by setting MAC address of the NIC card
as a static entry in Windows ARP cache. This problem does not occur in BSD style systems,
such as Solaris, Linux, and MacOS. Do the following three steps in the Windows command
console to disable keep-alive polling.
Obtain the MAC address of the RealTek NIC by doing Telnet to Sandpoint then exit
normally by disconnecting from the Telnet client console. There is no exit command from
DINK shell.
Type ‘arp -a’ to verify the DINK IP and MAC address is marked as ‘dynamic’
Type ‘arp -s xxx.xxx.xxx.xxx zz:zz:zz:zz:zz:zz’ to set the entry as static. (xxx is the IP
address; zz is the MAC address).
Problem 2. Can not bypass environment setting by holding backspace key
Solution: turn on RTS/CTS flow control or use lower baud rate.
G.2
Known Limitations in Telnet Console
Does not allow serial console download
Does not allow initialize NIC when connection is active.
Does not support simultaneous close.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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