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I want to make full process with my hands: writing startup, linker script, init file, makefile configurate toolset and so far and so forth.
That depends on many things, e.g. what Toolchain you want to use and of course which MCU (because of the memory layout, peripherals, etc.)A getting started point for the CM7 boot process maybe this http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.faqs/ka16790.htmlAlso, do you plan on writing assembler or C?I don't know your level of expertise with Cortex-M in general, but a really good read to get a profound understanding of the matter is "The definitive Guide to the ARM Cortex M3 and Cortex M4 Processor" by Joseph Yiu. Since you're asking about M7: the differences to the M4 are tiny and the book covers what you need to know...