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How to do an upgrade design for my project?

Question asked by erick huang on Oct 12, 2012

Hi all,

I'm doing a project, the project to the requirements for the safety of high, so it hasto use a secure boot. But the problem came.

If I put the all code encryption and signature, then every time system to verify the signature, but I hope my application can  be upgrade later alone, but not the kernel upgrade. In other words,what need to be upgrade is just one part of it, not the entire code. So, what should I go to design?