Logically restricting RAM usage

[Peter Jeremy]

This should be a FAQ but I can't find it in the FAQ or the 5.1
hardware notes.  I thought it was discussed here recently, but can't
find it in either my own archives or via the FreeBSD mailing list
search.

I have access to an AS4100 with 2.5GB RAM.  I'd like to install
FreeBSD but it's not feasible to physically remove memory.  I can't
find anything in the SRM to let me disable memory, is there a
bootloader option to limit memory?

Peter