How to use TPM for secure boot in uboot ?

How to use TPM in u-boot for Secure Boot?
U-Boot has TPM support and it provides some drivers and commands.
I have successfully enabled TPM in u-boot configuration.
But I don’t know how can I use it for secure boot.
Can anybody help?

What digi platform are you using?
Digi secure boot implementation is described here:

I am using TI AM5728 Device and u-boot open source software.

this form is discussion and support of Digi embedded platforms