According to this document, it appears that eMMC devices can be put into a 'permanent write-protection' mode, either for the entire device or a limited area, by sending certain commands programmatically to the device. Apparently, once that is done, that portion of the device is read-only and the operation cannot be reversed.
My questions are:
- How is this feature implemented?
- Surely, if some bits in a register can be set by a command, then it should also be possible to unset them?
- Is it really not possible to 'undo' this 'permanent write-protect' of an eMMC device?
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