Oracle Linux 5.5 Xen Kernel Hangs Due To Long Timeout (Cr 6899040) - Oracle Sun Fire X4800 Product Notes

Instead, it stays off for two seconds, blinks for three seconds, and then turns off.
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Oracle Linux 5.5 Xen Kernel Hangs Due to Long Timeout
(CR 6899040)
When booting from a PCIe ExpressModule or a Fabric Expansion Module (FEM), the system
might hang because it runs out of MSI interrupt vectors.
Workaround
1. In the GRUB configuration, set pci=nomsi.
2. Boot a non-Xen kernel.
3. Edit the file /boot/grub/menu.lst.
4. Add the following text to the Xen kernel init line stanza:
pci=nomsi
For example:
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You have a /boot partition. This means that
#
#
#
#
#boot=/dev/sda
default=1
timeout=5
serial --unit=0 --speed=115200
terminal --timeout=5 serial console
title Enterprise Linux Server (2.6.18-194.el5xen)
console=ttyS0,115200 debug pci=nomsi
title Enterprise Linux Server-base (2.6.18-194.el5)

Oracle Linux 5.5 Xen Kernel Hangs Due to Long Timeout (CR 6899040)

all kernel and initrd paths are relative to /boot/, eg.
root (hd0,0)
kernel /vmlinuz-version ro root=/dev/sda3
initrd /initrd-version.img
root (hd0,0)
kernel /xen.gz-2.6.18-194.el5 com1=115200 console=com1
module /vmlinuz-2.6.18-194.el5xen ro root=LABEL=/
module /initrd-2.6.18-194.el5xen.img
root (hd0,0)
kernel /vmlinuz-2.6.18-194.el5 ro root=LABEL=/
Linux Issues 57