TS-7840 ATSHA204

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The ATSHA204 is an i2c security device that provides:

  • 512 bits of OTP Memory. This can be written only once, and read many times,
  • Secure key storage for 16x 256-bit keys
  • Unique 72-bit serial number
  • Internal RNG

On the TS-7840 this is accessed on /dev/i2c-5 at 0x64.

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