The PUF uses helper data to re-create the
original KEK value over the complete guaranteed operating temperature and voltage range
over the life of the part. The helper data consists of a
<syndrome_value>, an <aux_value>, and a <chash_value>. The helper data can either be stored in eFUSEs or in
the boot image. See puf_file for more
information. Also, see this link to the section on "PUF Helper Data" in
Zynq
UltraScale+ Device Technical Reference Manual (UG1085).
| Address Offset | Parameter | Description |
|---|---|---|
| 0x8B8 to 0xEC0 | PUF Helper Data (1544 bytes) | Valid only when Boot Header Offset 0x44 (bits 7:6) == 0x3. If the PUF HD is not inserted then Boot Header size = 2048 bytes. If the PUF Header Data is inserted, then the Boot Header size = 3584 bytes. PUF HD size = Total size = 1536 bytes of PUFHD + 4 bytes of CHASH + 2 bytes of AUX + 1 byte alignment = 1544 byte. |