Problem in displaying message on RHEL6 on EFI during PXE boot

Hi,

I am doing PXE boot for RHEL6.4 on EFI and want to display custom messsage before loading vmlinuz and initrd.img, which is not working.

boot server side (In case of BIOS client):

In /var/lib/tftpboot/default file I am putting the message in below format:

SAY hello world

boot server side(In case of EFI client):

In /var/lib/tftpboot/efidefault file I am putting the message in below format:

SAY hello world

In case of BIOS client machine, message is being displayed successfully but in case of EFI it is not.

Please suggest any similar method for EFI as its very urgent.

Regards,
Indus