Not all memory seen on PP Zeus 040 board

[orb85750]

I'm running a PP Zeus 040 board (on my A2000) and not all its memory is seen.  Only 2 MB is found, whereas all 4 MB on the GVP hard disk controller card is found.  Is there some interference of sorts here?  (I also have Bridgeboard with, I think, 0.5 MB installed.)  Thanks.

[orb85750]

http://amiga.resource.cx/exp/zeus2040

Hmmm, but that page also says:
"it's not advised to set more than 2 MB to be autoconfigured"

So how does one get at the not-autoconfigured memory?  (and Sysinfo won't see it?)