Jan Birke wrote:
> Hi,
> 
> I have to connect my real-time network nodes with a hub that is only
> capable of 10Mbps and half-duplex. My Realtek network cards do not
> recognize that and always start in 100Mbps / full-duplex mode. So no
> packets are transmitted.
> Is there any possibility to bring the real-time network adapter up in
> 10Mbps / half-duplex mode?
> I had a look at rt_8139too.c and found the parameter description:
> MODULE_PARM_DESC(media, "8139too: Bits 4+9: force full duplex, bit 5:
> 100Mbps");
> But I am not quite shure what to do with that...

Try "modprobe rt_8139too media=0". If I parse the code correctly ATM,
that should make it switch to 10Mbps/half-duplex.

Hmm, something is fishy here anyway. Looks like we are currently locked
to FD/100Mps due to "media" being initialised with -1. Ah, that's due to
Fabian's changes for media selection:

http://rtnet.svn.sourceforge.net/viewvc/rtnet/trunk/rtnet/drivers/rt_8139too.c?r1=983&r2=1014

Fabian, can we choose a different default for "media" to get
auto-negotiation working? Otherwise, more documentation work would be
required here to deal with non-100Mps and non-FD cases more user-friendly.

Jan

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