07-16-2009
BIOS and Video RAM allocation
The blog you linked to noted that PCI-Express controllers can allocate 512 MB of address space. This might be what's happening, and the controller is allocating the upper part of the 32-bit memory address on the bus. Take out your video controller, and put in a generic PCI one (or use the motherboard's generic one??) In fact, take out ALL PCI-E controllers. Maybe the allocated memory will change.
The second thing to try -- not at the same time as above, please -- is specifying mem=4096M on the kernel line in grub. Go to grub.conf and change this, or on boot, append that option to the kernel-load line. Maybe the OS will magically remap whatever is eating the address space and see 4GB. Then, make sure you try to ALLOCATE that memory, to make sure it's actually usable. A simple perl script will do the job.
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LEARN ABOUT OPENSOLARIS
npe
npe(7D) Devices npe(7D)
NAME
npe - PCI Express bus nexus driver
DESCRIPTION
The npe nexus driver is used on X64 servers for PCI Express Root Complex devices that provide PCI Express interconnect. This driver is com-
pliant to PCI Express base specification, Revision 1.0a.
This nexus driver provides support for the following features: Access to extended configuration space, IEEE 1275 extensions for PCI
Express, Base line PCI Express error handling and PCI Express MSI interrupts.
FILES
/platform/i86pc/kernel/drv/npe
32-bit ELF kernel module.
/platform/i86pc/kernel/drv/amd64/npe
64-bit ELF kernel module.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+------------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+------------------------------+
|Architecture |x64 PCI Express-based systems |
+-----------------------------+------------------------------+
|Availability |SUNWcakr.i |
+-----------------------------+------------------------------+
SEE ALSO
attributes(5), pcie(4), pcie_pci(7D)
PCI Express Base Specification v1.0a -- 2003
Writing Device Drivers
IEEE 1275 PCI Bus Binding -- 1998
http://playground.sun.com/1275/bindings/pci/pci-express.txt
SunOS 5.11 12 Oct 2005 npe(7D)