Athlon X2 can't see all 4G of memory, help please

From: General Schvantzkoph (schvantzkoph_at_yahoo.com)
Date: 07/27/05 

Date: Wed, 27 Jul 2005 10:46:09 -0400

Just got an Athlon 64 X2 system with 4G of RAM. The motherboard is an MSI
K8N Neo4 Platinum (NForce 4). I'm using 64 bit Fedora Core 3 with a
2.6.11.12 kernel compiled for the Athlon 64.

The BIOS has a switch called S/W memory hole remapping, when OFF the BIOS
sees 3.5G of RAM as does Linux. When ON the BIOS sees all 4G of RAM but
Linux sees only 3G. I've given a mem=4096M to GRUB,

title Fedora Core (2.6.11.12)
        root (hd0,0)
        kernel /boot/vmlinuz-2.6.11.12 ro root=LABEL=/1 mem=4096M rhgb quiet
        initrd /boot/initrd-2.6.11.12.img

This doesn't help, is my grub config correct?

With the memory hole remapping ON the mem switch is required, if it's not
there I get a kernel panic.

Is there another switch that I need? Is there a kernel config switch that
I need to throw.

BTW this a custom kernel based on the .config file for the FC3 2.6.12
kernel. The current FC3 2.6.12 kernel panics on boot because they left our
the nv_sata driver. I built a standard 2.6.12.3 kernel but it panics
because of a problem with the Silicon Image RAID driver, the 2.6.11.12
kernel boots fine, however I had to install Nvidia's networking drivers to
get the ethernet controller to work, the kernel 2.6.11.12 drivers don't
seem to work although the drivers in the old 2.6.9 kernel that comes with
FC3 work fine.

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