On Tuesday 13 November 2007 07:06, Carlos E. R. wrote: > The Tuesday 2007-11-13 at 00:38 -0600, David C. Rankin wrote: > >> Some chipsets don't actually allow access to the full 4 GB. This > >> might be one of them. > > > > That's strange, In BIOS setup it correctly shows all 4 gigs, so > > shouldn't they be available since they are correctly recognized in > > the BIOS? Which chipset are you referring to? memory controller, > > etc.?
One possible, even probable problem is the physical address range in which I/O device registers are presented to the operating system. In machines that can address only 4 GB of physical address space, the range from 3-4 GB typically holds these addresses. If the BIOS, the mainboard hardware, the CPU and the kernel are all equipped to support the so-called Physical Address Extensions (PAE), then these I/O addresses can be placed at a higher physical address and the 3-4 GB range can be used for RAM. Most systems that support PAE have a BIOS option to disable it, lest software or CPUs that don't support it be rendered unable to access any device registers at all. You'll have to peruse the BIOS settings (or the BIOS manual) to find this (putative) option and then, assuming its there, set it appropriately. > The whole thing, including the wires in the board. > > Have a look here, for starters: > > <http://www.interact-sw.co.uk/iangblog/2005/08/05/is3gbenough> "Unknown host: www.interact-sw.co.uk" > ... > > -- > Cheers, > Carlos E. R. Randall Schulz -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
