Version-Release number of selected component (if applicable):

RHEL5u1 with kernel-debug-2.6.18-91.el5.ppc64.rpm prerelease kernel

How reproducible:

Follow the instructions for NFS root from
http://www.redhat.com/docs/manuals/enterprise/RHEL-5-manual/release-notes/RELEASE-NOTES-U1-ppc-en.html

The machine is a diskless IBM QS21 Cell/B.E. blade server.
  
Actual results:

Boot messages contain:
hub 3-0:1.0: USB hub found
hub 3-0:1.0: 5 ports detected
Loading sunrpc.ko module
Loading nfs.ko module
nfs: Unknown symbol __fscache_relinquish_cookie
nfs: Unknown symbol __fscache_write_page
nfs: Unknown symbol __fscache_uncache_page
nfs: Unknown symbol __fscache_set_i_size
nfs: Unknown symbol nlmclnt_proc
nfs: Unknown symbol __fscache_acquire_cookie
nfs: Unknown symbol nfsacl_encode
nfs: Unknown symbol nfsacl_decode
nfs: Unknown symbol __fscache_read_or_alloc_pages
nfs: Unknown symbol lockd_down
nfs: Unknown symbol lockd_up_proto
nfs: Unknown symbol __fscache_read_or_alloc_page
nfs: Unknown symbol __fscache_unregister_netfs
nfs: Unknown symbol __fscache_register_netfs
insmod: error inserting '/lib/nfipr: Unknown symbol ata_sas_port_init
s.ko': -1 Unknowipr: Unknown symbol scsi_device_get
n symbol in moduipr: Unknown symbol scsi_block_requests

Expected results:

regular boot from NFS, as with RHEL5u1 kernel.

Additional info:

This was reported to me by a blade customer, "Howard D. Gray" 
<howard.gray>

The reported fix from him is

== begin quote ==
To get it all working I altered mkinitrd like this:

================== snip ==================
--- /sbin/mkinitrd.ORIG 2008-04-28 08:58:28.856918809 +0200
+++ /sbin/mkinitrd      2008-04-28 10:13:39.838703626 +0200
@@ -69,7 +69,7 @@ modulefile=/etc/modules.conf
 rc=0

 IMAGESIZE=8000
-PRESCSIMODS="sd_mod"
+PRESCSIMODS="sd_mod libata ipr"
 fstab="/etc/fstab"

 vg_list=""
@@ -272,6 +272,9 @@ findmodule() {
         modName="gfs2"
     elif [ "$modName" = "nfs" ]; then
         findmodule sunrpc
+       findmodule fscache
+       findmodule nfs_acl
+       findmodule lockd
         modName="nfs"
     elif [ "$modName" = "usb-storage" -o "$modName" = "ub" ]; then
         usbModName="$modName"
================== snip ==================

My script to build the initrd and combine with the kernel image looks
like this:

================== snip ==================
VERSION=2.6.18-91.el5

rm -f ~/initrd-$VERSION.img
mkinitrd --with tg3 --rootfs=nfs --net-dev=eth0 --with sungem_phy \
        --with  spidernet --with usb-storage --with dm-mod \
        --with dm-snapshot --with dm-zero --with dm-mirror \
        --with dm-crypt --with dm-multipath \
        ~/initrd-$VERSION.img $VERSION

rm -f ~/zImage.initrd-$VERSION
mkzimage ~/vmlinuz-$VERSION ~/config-$VERSION \
        ~/System.map-$VERSION ~/initrd-$VERSION.img \
        /usr/share/ppc64-utils/zImage.stub  ~/zImage.initrd-$VERSION

================== snip ==================
== end quote ==