Scope; Amd64/Em64T On Hp Xw9300 Workstation May Report Total Memory Less Than Expected With The X86_64 Kernel; Description; Resolution - HP xw3400 User Manual

At the boot prompt, enter linux acpi=off.
3.
Proceed with the installation as usual.
4.
OR
Modify your configuration so that you are using both USB Mouse and Keyboard or PS/2 Mouse and
Keyboard.
AMD64/EM64T on HP xw9300 Workstation May Report Total Memory
Less than Expected with the x86_64 Kernel

DESCRIPTION

The RHEL4 64-bit kernel that is installed on xw9300 Workstations is the x86_64 kernel.
If the kernel reports less memory than expected, then you may want to enable Memory Remapping in
the BIOS. With Memory Remapping disabled you will see ~0.3-0.8G less than expected due to the
kernels need to allocate space for Memory Mapped IO.
With Memory Remapping disabled you may see nearly 1GB less of memory than expected due to the
fact that the kernel reserves the ~3GB to 4GB region of memory for memory mapped IO.
With a 64-bit OS, HP recommends that Memory remapping be enabled.

SCOPE

HP workstation xw9300 system with RHEL4 64-bit OS

RESOLUTION

To enable Memory Remapping in the BIOS:
Reboot the workstation.
1.
When you see the blue highlighted "F1: Boot" press F10 for Computer Setup Utility.
2.
Select your language.
3.
Use the Arrow keys to move across to Advanced.
4.
Use the Arrow keys to move down to Chipset/Memory.
5.
Use the Arrow keys to move down to Memory Remapping.
6.
Use the -> Arrow key to set the entry to Enable.
7.
Press F10 to Accept, Press F10 again followed by the Enter key and Press F10 one last time
8.
to save the changes.
Boot as usual.
9.

AMD64/EM64T on xw9300 Workstation May Panic During Install

DESCRIPTION
When installing RHEL 4 [AMD64/EM64T] on the xw9300 Workstation, you may see a panic
indicating "PCI-DMA: high address but no IOMMU" or a panic on the console which includes acpi_
functions.
SCOPE
Installing RHEL 4 AMD64/EM64T on HP xw9300 Workstation
RESOLUTION
NOTE: This issue is resolved in RHEL4U2. If you are using RHEL4 or RHEL4U1, then the following
resolution still applies.
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