Dell Openmanage/Omreport failed after updating to CentOS 6.4

After updating a testing machine from CentOS 6.3 to 6.4, the Dell OpenManage tools stopped working AT ALL.
It seems that with the lastest CentOS kernel (2.6.32-358.2.1.el6.x86_64), they moved away some IPMI drivers from kernel modules to "built-in"

The result is :

 # omreport chassis  
 Health   
 # srvadmin-services.sh start  
 Starting Systems Management Device Drivers:  
 Starting dell_rbu:                     [ OK ]  
 Starting ipmi driver:                   [FAILED]  
 Starting Systems Management Device Drivers:  
 Starting dell_rbu: Already started             [ OK ]  
 Starting ipmi driver:                   [FAILED]  
 Starting DSM SA Shared Services:              [ OK ]  
 /var/log/messages reports :   
 instsvcdrv: /etc/rc.d/init.d//dsm_sa_ipmi start command failed with status 1  

Solution : 

 # yum install OpenIPMI  

Note : There is no need to start or chkconfig the service.

You can check that the IPMI components are seen with the following command :

 # service ipmi status  
 ipmi_msghandler module in kernel.  
 ipmi_si module in kernel.  
 ipmi_devintf module loaded.  
 /dev/ipmi0 exists.  

Then start Openmanager services :

 # srvadmin-services.sh start