The installation of RHEL4 update 5 hangs during installation process while trying to probe devices. To get out of this problem while installation use the following command line:
linux pci=nommconf all-generic-ideor
linux pci=conf1 all-generic-ideOnce the installation is complete do not forget to modify grub.conf, else it wont boot up.
Modify grub.conf file to pass "pci=nommconf" as additional parameter to kernel.
Example:
title Red Hat Enterprise Linux ES (2.6.9-55.ELsmp)
root (hd0,0)
kernel /boot/vmlinuz-2.6.9-55.ELsmp ro root=LABEL=/1 rhgb quiet pci=nommconf
initrd /boot/initrd-2.6.9-55.ELsmp.img