Is it possible to see memory over 3GB on 32-bit FreeBSD?

Yuri yuri at
Wed Feb 17 23:59:51 UTC 2010

Erik Trulsson wrote:
> It very much depends on what hardware you have in the system.  Just
> about every expansion card or I/O device will reserve some of the
> address space for its own use.  Some devices will need a lot of space - 
> a graphics card with 256MB of RAM on it will use (at least) 256MB of
> the address space for example.

This doesn't seem like a good idea that video memory is always mapped to 
system memory. What if one day graphics card gets 4GB RAM? Then we won't 
even be able to have 32-bit OS working with such card and in 64-bit OS 
4GB of memory would be grossly wasted.


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