Boot Header Attributes - 2021.2 English

Bootgen User Guide (UG1283)

Document ID
Release Date
2021.2 English

The image attributes are described in the following table.

Table 1. Versal ACAP Boot Header Attributes

Field Name

Bit Offset


Default Value


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