CONFIG_HIGHMEM64G=y for x86_64 SMP kernels

[Alan Cox]

On Tue, Aug 31, 2004 at 10:42:14AM -0400, Ed Hill wrote:
> I guess it was just a coincidence that some of the kernels worked with
> mem=12G and others didn't.  I've moved the machine to a new location and
> now *none* of the kernels I have (neither mine nor the Fedora ones) will
> boot with "mem=12G".  The best I can get to work is "mem=3950M".

If you don't specify mem= does it find all your RAM. ALso what chipset ?