[sw] Flash secure erase and guidance
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@moidx is already working on this.
Since Jan 12, 2023.
Component:Doc
Component:Security
SW:cryptolib
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Description
### Description
There may be a software need to implement a "secure" erase.
This is an erase that is multi-pass where after the data is erased a random value is then written.
It should also be well defined when such an erase should be used, since uncontrolled usage of such a feature may degrade flash endurance.
Some examples of when we would use this is when sensitive data is wiped, such as keys, owners data during ownership transfers.
There is no hardware change request with this, but it does need to be documented somewhere as guidance.
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