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One Time Progamming Cells of Raspberry CPU
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The Raspberry Pi CPU has 16 custom OTP cells that can be programmed from a user application one time.

OTP cells are interesting if you want save a permament license code on your hardware for example that cannot be deleted any more.

The Raspberry Organization dedicated an extra article on their web site how to use the OTP cells here. For own tests the referenced shell command
Code:
vcgencmd

comes precompiled in netPIs Raspbian Docker container here. In there it is located in the Raspbian's default folder /opt/vc/.

If you are interested in the source code of this command you find it in the userland area of the official Raspbian here.
You never fail until you stop trying.“, Albert Einstein (1879 - 1955)

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