how to let redhat load network card driver automatically

[Forest King <myjlwang yahoo com>]

Hi,

I installed two redhat 7.3 from an installation
server.
They downloaded the installation image through
network. Everything was fine until they reboot
themselves. 
These two machines are supposed to mount /home from
the server nfs, but failed. I found out this was
because the network card is down (could not use
#ifconfig eth0, no such device). 

> Bring up interface eth0                    ok
> start service pfilter
> starting piflter: /usr/sbin/pfilter:  can not find
any interface names with /sbin/ifconfig command       
                               failed
> Mounting  NFS filesystem: mount : RPC : port mapper
failure-RPC: unable to send  failed

The network cards are Broadcom 5703 10/100/1000
Ethernet controllers on the system board.
I also found there were two drivers already in
machine: tg3.o and bcm5700.o. But neither of them was
loaded when system was booting up.
So, my question is: How can I make the system to load
one of the drivers when it is booting up, so the it
can mount  the /home nfs directory successfully?

thanks
Forest

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