Hi,
> then I must have 2 Ethernet lines. Is it true ?
correct

> My PC-based controller has two Ethernet lines handled by 2 chips of the 
> same type (8139too).


> Is it possible to configure one line for RTnet and the other for 
> non-real time linux environment ?
no problem.

 > What can I do to obtain this goal ?

rmmod the non-realtime driver, load and start rtnet on a card (see 
script fragment below) then load the non-realtime module and bring it up.

I've pasted in a part of a script that I used to start rtnet with more 
than one card at some stage. Adapt accordingly. Its a bit messy I 
concede but there is some history on this list about this too.

#NIC modules
#insmod /usr/local/rtnet/modules/rt_via-rhine.ko
#insmod /usr/local/rtnet/modules/rt_e1000.ko  #cards=1 #,0,0  # 0,1,0 
means use the middle (eth1) card. 1,0,0= use eth0 etc
insmod /usr/local/rtnet/modules/rt_8139too.ko  #cards=1 #,0,0  # 0,1,0 
means use the middle (eth1) card. 1,0,0= use eth0 etc (Only required if 
all NICS use the same driver) otherwise the other NICs remain unaffected 
if their driver is not unloaded.
#insmod /usr/local/rtnet/modules/rt_eepro100.ko
#insmod /usr/local/rtnet/modules/rt_natsemi.ko



> Does RTnet 8139too driver handle collisions ?
Someone else might be able to answer this.

Roland


> Thanks to all in advance.
> Rizzardo
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