RTL-3.0 and BusyBox

[Ken Teh <teh@phy.anl.gov>]

I've built a busybox floppy to boot a machine.  Booting works and so does
insmod'ing a network driver.  But, insmod'ing rtl.o fails with the
following unresolved symbols.

vsprintf
free_irq
console_drivers
request_irq
__start_rtlinux_funcs
printk

The busybox floppy was constructed per Bruce Perens' article in ELJ.

If I use the same bzImage to boot the machine from a hard disk with a "full"
normal installation, insmod rtl.o works fine.  The 'frank' example works
fine.

Versions: busybox-0.51, Linux-2.2.18, RTL-3.0.  What am I missing?