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OTP read disable #1411

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Feb 25, 2020
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OTP read disable #1411

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12 changes: 11 additions & 1 deletion hardware/industrial/README.md
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Expand Up @@ -63,4 +63,14 @@ It is possible to lock the OTP changes to avoid them being edited again. This ca
pi@raspberrypi:~ $ /opt/vc/bin/vcmailbox 0x00038021 8 8 0xffffffff 0xaffe0000
```

Once locked, none of the customer OTP values can be accessed.
Once locked, the customer OTP values can no longer be altered. Note that this locking operation is irreversible.

## Making Customer OTP bits unreadable

It is possible to prevent the customer OTP bits from being read at all. This can be done using a special argument with the OTP write mailbox:

```
pi@raspberrypi:~ $ /opt/vc/bin/vcmailbox 0x00038021 8 8 0xffffffff 0xaffebabe
```

This operation is unlikely to be useful for the vast majority of users, and is irreversible.