Overcloud baremetal installation stuck at pxe boot

I followed the link https://openstack.redhat.com/Deployin... , and did a baremetal undercloud/overcloud installation. Before doing the last step of the installation --instack-deploy-overcloud --, I did some change to the /usr/lib/../baremetal/ipmi.py to suit my environment. I could see the nodes rebooting and starting the pxe boot. But the pxeboot shows below and is stuck there forever.