[U-Boot] Booting different kernel from U-Boot based on time stamp

I am using U-Boot and two kernel Image(uImage). I want to add some code in U-Boot which will select kernel based of time stamp. I am using MIPS architecture. this two kernels are in different MTD partition.

For example:-

|If kernel-1 is new, U-Boot will boot Kernel-1. and leave kernel-2 as it is. If kernel-2 is new, U-Boot will boot kernel-2. and leave kernel-2 as it is. |

Questions:-

|Is it possible to do so? How can I add such functionality in U-boot? Where to chage the code for the same? |