Kieran Mansley wrote: > On Thu, 2007-07-19 at 18:11 +0300, Caglar Akyuz wrote: >> Kieran Mansley wrote: >>> On Thu, 2007-07-19 at 15:35 +0100, Kieran Mansley wrote: >>>> Can you get a small ethereal capture to illustrate this? The fact that >>>> the hub makes a difference is interesting. I wonder if it is a problem >>>> with the boards seeing packets from one of the other boards. Does it >>>> happen in response to all broadcast ARP packets, or only some? Does it >>>> happen in response to other broadcast packets? >>> Is there any traffic (other than broadcast packets and TCP ACKs) going >>> back from the PC to the devices? If not, it could be just that the >>> board receiving data is causing them problems (rather than it being >>> broadcast packets in particular). You could try sending a UDP stream at >>> the board (which should just drop the packets if there is nothing >>> listening to receive them) and see what that does. >>> >> No there isn't no other traffic other than packets and ACKS. Do you >> think pinging may cause the same effect because I'm pinging the devices >> while packets are flying. Some times pinging was ok, sometimes it >> crushed the boards. > > If pinging kills the board I suggest there is something seriously wrong. > Not sure where though I would guess it might be something to do with > protection of the core stack. Perhaps you have an rx packet and a tx > packet being processed at the same time and this causes corruption. How > do you synchronise processing of RX and TX in your port?
I rely on sys_arch_protect and sys_arch_unprotect. They're disabling/enabling interrupts at the cpu level. I also tried adding some other protection. For instance, I disabled passing broadcast packets from my mac driver to lwIP while I'm transmitting any packets.(disabled before calling tcp_ouput, enabled after tcp_sent callback) One thing I suspect is that there is something wrong with physical layer, or at least there are more than one problems and one of them is related to phy. For that reason, I disabled full duplex mode and I'm using half-duplex mode at the both sides, I think full-duplex mode doesn't help me much while using a hub.(I'm not %100 sure...) I'm trying to catch an appropriate packet capture, I'm sure you will say some thing better than me after seeing it. Thanks for your concern. Caglar > > Kieran > > > > _______________________________________________ > lwip-users mailing list > [email protected] > http://lists.nongnu.org/mailman/listinfo/lwip-users > > > _______________________________________________ lwip-users mailing list [email protected] http://lists.nongnu.org/mailman/listinfo/lwip-users
