trixbox 2.4 kernel-pae

If Anaconda (the CentOS installer) detects a PAE compatible processor it will install kernel and kernel-pae

kernel-PAE (x86-only): Contains a kernel with support for 64GB of memory on x86 systems through Physical Address Extensions (PAE). Only x86 CPUs that support PAE can run this kernel. This kernel is provided because x86 systems can’t address more than 4GB of memory without PAE extensions.

trixbox is package based and everything wraps around modules in a specific kernel.

If your system gets the pae kernel you can correct this by editing /etc/grub.conf

you should see something to the effect of :
# 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
# all kernel and initrd paths are relative to /boot/, eg.

title trixbox (2.6.18-53.1.4.el5PAE)
root (hd0,0)
kernel /vmlinuz-2.6.18-53.1.4.el5PAE ro root=LABEL=/1 acpi=off
initrd /initrd-2.6.18-53.1.4.el5PAE.img
title trixbox-base (2.6.18-53.1.4.el5)
root (hd0,0)
kernel /vmlinuz-2.6.18-53.1.4.el5 ro root=LABEL=/1 acpi=off
initrd /initrd-2.6.18-53.1.4.el5.img

Simply use # to comment out:
#title trixbox (2.6.18-53.1.4.el5PAE)
#root (hd0,0)
#kernel /vmlinuz-2.6.18-53.1.4.el5PAE ro root=LABEL=/1 acpi=off
#initrd /initrd-2.6.18-53.1.4.el5PAE.img

Now you can ensure it will boot to the correct image.

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