Kernel only detection 2 GB of memory on AMD

Thomas E. Spanjaard tgen at
Wed Mar 3 11:34:22 PST 2010

Vincent Stemen wrote:
> On Tue, Mar 02, 2010 at 10:57:58PM -0800, Matthew Dillon wrote:
>>     I think the only way the kernel will be able to see all the memory
>>     on that box is if you run a 64-bit DFly kernel.
> So it is normal to only be able to use 2GB of memory in 32-bit mode??  

It is if the BIOS only maps 2Gibyte worth of RAM below the 4Gibyte mark.
Most BIOSes allow you to disable memory remapping entirely though, in
which case you can use as much memory as is left when subtracting all
other physical address space consumers (most importantly memio).

	Thomas E. Spanjaard
	tgen at
	tgen at

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