Fedora 10 64 bit : only 3,2 GB RAM in stead of 4 GB
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Check through all the BIOS menus and see if there are any options regarding memory remapping or reporting memory to the OS, or installing the OS. One of those might affect the way the BIOS configures the ram before starting Linux.
You might also check the web site from the motherboard manufacturer to see if there is a newer version of the BIOS available.
What brand/model motherboard is it and what brand/version BIOS?
I'm not 100% certain this is a BIOS problem, but it looks like a BIOS problem.
From what I read on the MSI web site, the latest BIOS has "Improved memory compatibility." If you're brave enough to try updating the BIOS, this might help. (I noticed that the original post contained the words "BIOS bug.")
In my experience, though; many Intel motherboards use the top of the 4GB address space for BIOS, video cards, and other PCI cards. This typically leaves 3GB plus a fraction for the OS to use.