Did you mean e100? As far as I can tell (and that's not very far) there is no e1000 drivers in R5A15.1 They have the e100, but not the e1000.
I also have an Intel 82547EI chip on my Asus Mother board (P4C800-E) My problem is that the network is only getting enabled as a 10MB, not a 100 MB link that I have.
I grabbed the drivers from Intel's site:
http://tinyurl.com/d7qce
And followed the instructions for building and installing (doing the modprobe).
If I do an lsprobe, the module shows that it is loaded.
I've tried adding an alias to my /etc/modules.d/alias of:
alias eth0 e1000
and rebooted, but that didn't help.
And if I follow the instructions in:
http://mysettopbox.tv/phpBB2/viewtopic.php?t=4554
and run netcardconfig and select yes to the first question (Use DHCP) then I can get it up to 100MB, temporarily. But a reboot will put it back to 10MB.
Hope this helps.
Peter