[En-Nut-Discussion] ethernut 2.1B No RAM at 0x4000

[Harald Kipp]

Hello Axel,

At 18:52 18.12.2005 +0100, you wrote:

>Hallo everyone!
>My brand new ethernut 2.1B is teasing me.
>Powersupply is 9V= with a maximum current of 1A
>Voltage measured at Pin1 is 3,3V
>Voltage measured at Pin3 is 5,0V
>My scope shows no spikes etc. on the supplylines.
>Nothing connected to the expansion ports.

Nevertheless, a bad power supply is failure #1. May be you
can try another one, preferably 12V. Theoretically 7.6V
should be the lower limit. The rectifier drop is 1.4V and
the LM1086 regulator needs 1.2V. Btw. the upper limit is
16V, at which the protection diode starts short cutting the
supply.

>Testing NIC...       link failed

Turning on the LAN91C111 stresses the power supply, so this
is a typical result.


>No RAM at 0x4000

This may be a result of switching on the LAN controller in
the previous test (and the resulting voltage drop).



>X:
>repetitiv cycle: LED4 lights, LED3 flashes, both gowing dark
>
>After a while (1min 2min) sometimes there's a message:
>
>MAC address (000698210xxx):
>Host name (ethernut):
>IP address (0.0.0.0):
>Using DHCP or ARP method (Y):
>HTTP server running. URL http://xx.xx.xx.114/

Sometimes the automatic start sequence succeeds to initialize
the LAN Controller.



>Broken hardware? Please not, as there already have been delivery problems,
>I need this nut very urgend and my old 1.3 board isn't really an option.

Always possible. I'd suggest to try a different power supply
first and, if this doesn't help, give me a call (you're located
in Germany, right) or send a short email to info at egnite dot de.
I'm sure we can help.

Harald