Is any ways to debug the "mb2-bootloader"?

There are many things which I am interested in, is there any ways to debug the “mb2-bootloader”? Any suggestions will be appreciated.

Dear merlinwu,
Can you file a bug for your topic?
Please login to with your credentials. Please check MyAccount->MyBugs->Submit a new bug to file bug.
Please share ID here to follow up. Thanks.