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Full Discussion: Installed memory ≠ usable size?
Special Forums Hardware Filesystems, Disks and Memory Installed memory ≠ usable size? Post 302333764 by otheus on Tuesday 14th of July 2009 03:55:11 AM
Old 07-14-2009
Quote:
That's not what I'm talking about. This is memory that would show up as used, not memory that would fail to show up.
*sigh* No. This would be memory that doesn't show up. You are confusing memory usage of the OS with BIOS allocation. The BIOS might be allocating 512 MB for hardware, but if it supports a 64-bit OS and a 64-bit address space, then that should not be a problem. You are using a newer (2008 -- his article was in 2007 and referred to "old" motherboards) Motherboard, and it appears it can support this configuration.

Read this article here and you can see how to configure the BIOS for a bunch of things. It does not show video RAM allocation, but I'm sure you'll find it. When you have tuned it down to 128 MB RAM, and checked the memory size again, and if you're STILL missing 512 MB, then I'll eat my words. Ok?
 

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LEARN ABOUT FREEBSD

pnpbios

PNPBIOS(4)						 BSD/i386 Kernel Interfaces Manual						PNPBIOS(4)

NAME

     pnpbios -- support for embedded devices on the motherboard

DESCRIPTION

     The pnpbios driver enumerates embedded ISA devices on the motherboard whose BIOS supports ``Plug and Play BIOS Specification''.  It assigns
     ISA bus resources (interrupt line, DMA channel, I/O ports, and memory region) to each device and activates it.

     If it cannot assign necessary resources to a device without causing conflict with other devices in the system, the device will not be acti-
     vated and will be unavailable to programs.

CAVEATS

     There is no explicit way to disable individual embedded devices.  The pnpbios driver will find all devices reported by the ``Plug and Play
     (PnP)'' BIOS and try to activate them all.

     There is no way to explicitly assign particular resource to a device.  The resource assignment is fully automatic and there is no provision
     for manual override.

SEE ALSO

     pnp(4)

STANDARDS

     Compaq, Phenix, and Intel, Plug and Play BIOS Specification Version 1.0A, May 5, 1994.

     Compaq, Phenix, and Intel, Plug and Play BIOS CLARIFICATION Paper for Plug and Play BIOS Specification Version 1.0A, October 6, 1994.

HISTORY

     The pnpbios driver first appeared in FreeBSD 4.0.

AUTHORS

     The pnpbios driver was written by Mike Smith.

BSD
								September 20, 2001							       BSD
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