System RAM vs. shared video memory

C

Claus

I've got a machine running FreeBSD 8.2 amd64 with the following configuration:
M/B: Gigabyte GA-880GMA-UD2H
CPU: AMD Phenom(tm) II X6 1090T Processor
RAM: 4x 4GB DDR3-1333

512 MB of RAM (by default) are dedicated as shared video memory.
FreeBSD drops to kernel panic after using almost whole amount of RAM.
I am confused of such strings in dmesg:

Code: 
Apr  6 01:21:29 note kernel: real memory  = 17179869184 (16384 MB)
Apr  6 01:21:29 note kernel: avail memory = 16426295296 (15665 MB)

Actually, OS should see only 16384-512=15872 MB of system RAM. Looks like FreeBSD uses shared memory as regular address space and fails as this space is overwritten by graphics adapter.

Any thoughts?
 
Upon panics (during port builds) with a onboard video (amd also, quad-core ) and FreeBSD 9, I installed a pci-e graphics card and they more or less disappeared. Sorry cannot be of more help.
 
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