Problem in Configure grub boot loader

Hi,

I have patched the kernel with rt patch and compiled properly.
linux-3.10.4.tar.xz
patch-3.10.4-rt1.patch.bz2

Now, i am facing problem in configuring using grub.
i added new entry in grub.cfg

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
menuentry "RTLinux (RealTime Kernel)"{
ecordfail
gfxmode $linux_gfx_mode
insmod gzio
insmod part_msdos
insmod ext2
set root (hd0, msdos7)
kernel /boot/rtzImage ro root = /dev/hda3

}
### END /etc/grub.d/40_custom ###

When i select RTLinux in grub it's giving error.
Is this menuentry is correct?
Can any one, help me out here.

Thanx.