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Some ideas about secure boot here (although only at a a very high level):[url="http://infocenter.arm.com/help/topic/com.arm.doc.prd29-genc-009492c/CACGCHFE.html"]infocenter.arm.com/.../url]For a development board you won't be able to change the ROM - hence the "read-only" part of the name - so you will have to emulate the secure boot. If you are looking to buy an off-the-shelf chip then secure boot is often an advertised feature, as it is something which much be built-in by the silicon vendor during device manufacture. As you are finding, you can't add it afterwards (unless there is some form of write-once Flash or metal fuse, but unusual for large regions suitable for code). If you are building your own chip, then part of the process will be defining your own ROM mask to use when the chip is manufactured.