usb and too much memory?

[Tom Horsley]

I've just gone from 2 gig of memory to 3 gig in my x86_64
FC5 system with an asus A8N-E, and suddenly I get all kinds
of errors about USB problems when the system boots and the
USB scanner is no longer recognized.

Is there some known problem with > 2 gig of memory and
the onboard usb with the x86_64 kernels?

I also have an i386 boot partition on the same machine,
and if I boot the i386 kernel, it has no problems with
USB and the scanner works fine, so it doesn't appear
to be a hardware issue.