[U-Boot] potential Uboot Ping problem

[Steven Zedeck]

Peter Tyser wrote:
> 
> Hi Steven,
> 
> On Mon, 2009-06-01 at 08:03 -0700, Steven Zedeck wrote:
>> I guess thats good news. I looked inside the cmd_ping code a bit. I bet
>> there's a "while" loop somewhere that is waiting for something and may
>> not
>> have a timeout loop. Any ideas?
>> 
>> Thanks,
>> Steve
> 
> Please don't top post, it makes the conversation hard to follow.
> http://www.caliburn.nl/topposting.html
> 
>> Premi, Sanjeev wrote:
>> > 
>> >> -----Original Message-----
>> >> From: u-boot-bounces at lists.denx.de 
>> >> [mailto:u-boot-bounces at lists.denx.de] On Behalf Of Steven Zedeck
>> >> Sent: Monday, June 01, 2009 8:05 PM
>> >> To: u-boot at lists.denx.de
>> >> Subject: [U-Boot] potential Uboot Ping problem
>> >> 
>> >> 
>> >> Hi,
>> >> It appears the ping in UBOOT is broken. The ping works fine 
>> >> if you have a
>> >> network connection. But if the network connection is 
>> >> disconnected the ping
>> >> hangs the system. There is no response to Control-C either. I 
>> >> have to power
>> >> cycle the proto to get back to a UBOOT prompt. Is this a 
>> >> known issue or did
>> >> I possibly break something?
>> >> 
>> >> I have a board based on the Atmel AT91SAM9RL-EK. My theory is 
>> >> that it "may"
>> >> be a generic problem with the uboot ping. I can't confirm 
>> >> that since the
>> >> only hardware I have is our protos.
>> > 
>> > It was noticed on the OMAP3EVM last FRI and we were suspecting
>> > it to be problem with the omap3 board configuration itself.
>> > (Though did not spend much time in debug).
>> > 
>> > Now, I too get a feeling that it could be a generic problem.
>> > 
>> > Best regards,
>> > Sanjeev
>> >> 
>> >> Does anyone else have a board with another MAC/PHY that you 
>> >> can try this on?
> 
> Ideally, if there is no link, the ping command should just exit
> gracefully without attempting network operations.  Eg on my 8561-based
> board with no cables plugged in:
> => ping 192.168.1.1
> Auto-neg error, defaulting to 10BT/HD
> eTSEC1: No link.
> Auto-neg error, defaulting to 10BT/HD
> eTSEC2: No link.
> ping failed; host 192.168.1.1 is not alive
> 
> <there is no delay in the printing of the above info>.
> 
> The tsec driver's init function returns -1 when link isn't detected.
> Perhaps your ethernet driver should do the same?
> 
> What happens if you ping a non-existent IP address?  Does that also hang
> the board?  Do other network operations hang the board if no ethernet
> cable is plugged in?
> 
> Best,
> Peter
> 
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> 

The ethernet driver is also from the uboot distribution. Its enc28j60.c.
I'll need to go through it to see where its hanging assuming its in that
driver or the ping code that calls it.

thanks,
Steve
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