From this link, I found that the TI support engineer has achieved around 2seoncs to boot Linux on AM625 EVM.
As not all details are described, I would like to get some help on how to optimize the Linux boot time.
I built the image from the default Yocto project provided by the official SDK and it takes around 20 seconds to fully boot up.
I tried to disable the unnecessary drivers such as network and video but it only makes less than 2 seconds difference.