How to debug GRUB2 if my grub_dprintf is not working ?

[shenbagaraja s]

I am facing issue in my server which is hanging up everytime on grub shell.
And I am trying to debug this grub2 issue by adding grub_dprintf.
But those printf statements whatever I added are not visible in the
console.  I also tried "set debug = all" from the grub shell prompt.

Is there some other way of adding the debug prints inside grub2 source?

Also I would like to know about how to debug Grub2 issue from  using GDB?

My   GNU GRUB version is 2.02~beta and OS is RHEL 7.4

Could anyone help on this?

Thanks