The image attributes are described in the following table.
|
Field Name |
Bit Offset |
Width |
Default Value |
Description |
|---|---|---|---|---|
| Reserved | [31:18] | 14 | 0x0 | Reserved for future use, Must be 0 |
| PUF Mode | [17:16] | 2 | 0x0 |
0x3 - PUF 4K mode. 0x0 - PUF 12K mode. |
|
Boot Header Authentication |
[15:14] | 2 | 0x0 | 0x3 - Authentication of the boot image is done, excluding
verification of PPK hash and SPK ID. All others - Authentication will be decided based on eFUSE RSA/ECDSA bits. |
| Reserved | [13:12] | 2 | 0x0 | Reserved for future use, Must be 0 |
| DPA counter measure | [11:10] | 2 | 0x0 | 0x3 - Enabled All others disabled.(eFUSE over rides this) |
|
Checksum selection |
[9:8] | 2 | 0x0 |
0x0, 0x1, 0x2 - Reserved 0x3 - SHA3 is used as hash function to do Checksum. |
| PUF HD | [7:6] | 2 | 0x0 |
0x3 - PUF HD is part of boot header All other - PUF HD is in eFUSE. |
| Reserved | [5:0] | 6 | 0x0 | Reserved |