How to debug "in application programming" embedded software

"echo" <[email protected]> Mon, 9 Mar 2020 17:41:02 +0800

Newsgroups	gmane.comp.gdb.devel
Message-ID	<[email protected]>

There's two programs in the flash, one boots the other one. How can I debug both programs (boot and app)? I can load both programs into flash, but I don't know how to debug both of them. Could you give me some hints?

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