Question: Cardbus Tulip card works unreliably (system crash) 

Forum: PCMCIA Network Adapter Issues
Date: 2000, Feb 03
From: <rolf.fiedler@ferrari.de>

I hvae a cardbus tulip based 10/100 eth card, and it is detected by the pcmcia core and the proper drivers are loaded. The system is a palmax pd1000 running 2.2.14 with pcmcia 3.1.9. once the card is inserted, it is detected and ifconfig and route is done. I can ping the network (reliably). I can do telnet and everything that does not transfer a lot of data. However, if I try to transfer data (like a ftp download) the whole system freezes and I have to turn it off. I don't know how to debug the problem, since the system crashes. An ne2000 compatible ethernet card works like a charm, however it is a friend's card :-(. On the cardbus card it says "Gericom Cardbus 10/100 Fast Ethernet" I have tried to play around with the resource info in the pcmcia config., however without success (same behaviour). I have tried a 2.3.3? kernel, same result. Any hints?

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System log messages? Re: Question: Cardbus Tulip card works unreliably (system crash) Date: 2000, Feb 03 From: David Hinds <dhinds@pcmcia.sourceforge.org>

It is often useful to include system log messages with bug reports. The PCMCIA-HOWTO has some instructions for debugging system crashes, which may yield some additional information. -- Dave

1. Feedback: sys log messages by rolf.fiedler@ferrari.de, 2000, Feb 04

More: detailed bug report Re: Question: Cardbus Tulip card works unreliably (system crash) Date: 2000, Feb 07 From: <rolf.fiedler@ferrari.de>

I did some more experiments regarding the previously-mentioned bug. I tried (kernel/pcmcia) 2.2.14/1.3.9 and 2.2.14/1.3.10 with the same results. I can insert the card and the network config is done. I can ping & telnet without crashes. I can do a ftp and everything on the control connection works. If I do a download the system crashed without any messages printed anywhere (irq pending and not handled?). I thought the packet size is triggering the bug. So I did a ping -s 1500. That works long enough to make experiment boring. Next theory is the packet rate. What happens if new packets arrive while the previous is not transferred off the DEC-chip yet? I thought a flood ping might show this and it did. A ping -f kills the system after a while (60 seconds or so). Please note that we are talking about a slow computer here. It is a 166MHz Cyrix MediaGX with only 55bogomips (that is 0.055 bogogips :-). I will do any experiments that are suggested (well, the ones that seem useful - I will not stand on my head and hold my breath for 30 minutes). who is maintaining the tulip_cb module? I suspect the bug there. What can I do if I have a kernel that I know how to crash reproducable but that just enters an endless loop (irq condition not reset?) or locks the bus or whatever. How do I debug this? I would love some oopses, but I can't get any :-( Many thanks, Rolf

Warning: Problem resolved Re: Question: Cardbus Tulip card works unreliably (system crash) Date: 2000, Feb 08 From: <rolf.fiedler@ferrari.de>

The Palmax PD1000 mini-notebook requires the setting of PCIC_OPTS="cb_write_post=0" in /etc/sysconfig/pcmcia to work reliably with the tulip cardbus driver. Without the option the system will hang if the ethernet packet arrival rate is high. thank you David! Rolf

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