FreeBSD 7.0R and 7.0CURRENT (amd64) show only 2,5Gb RAM from 8Gb

Michael-John Turner mj at
Wed May 21 12:39:49 UTC 2008

On Mon, May 19, 2008 at 08:49:41PM +0400, Nifty wrote:
> I have two PC's based on iP965 and iG33 chipsets, 
> both have iC2D Quad 2.4GHz CPU and both have 8Gb (4 x 2Gb) PC2-6400 RAM.
> After installing FreeBSD 7.0R (amd64) and FreeBSD 7.0CURRENT (amd64) -
> on iP965 dmesg show me 2,5Gb of RAM, on iG33 dmesg show 3,1Gb of RAM :(

Do either of the motherboards have a memory-hole related setting? If so,
does changing it (eg to ignore the memory hole) make more memory visible to
FreeBSD? This is a common 'issue' with systems that have more than ~3GiB
RAM - the area of memory reserved for 32-bit PCI devices (the 'memory hole'
above) can prevent access to memory beyond it.

Michael-John Turner 
mj at      <>

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