unable to access dev/io-net/en0 no such file or directory af

Hi all,
after installing QNX (released 01/18/01), I have no network device listed in
my Network Configuration. While booting it says:
unable to access dev/io-net/en0 no such file or directory
I´m using a REALTEK 8139 network card and the docu says, that there is a
driver for it (rtl).
How can the system find this driver at startup/installing?

Thanks for your help
Christian