The following table contains generic information related to the PDI image.
| Offset | Name | Description |
|---|---|---|
| 0x0 | Version |
0x00040000(v4.0):
0x00030000(v3.0): updated secure chunk size to 32 KB from 64 KB 0x00020000(v2.00): IHT, PHT sizes doubled |
| 0x4 | Total Number of Images | Total number of images in the PDI |
| 0x8 | Image Header Offset | Word address to start of first image header |
| 0xC | Total Number of Partitions | Total number of partitions in the PDI |
| 0x10 | Partition Header Offset | Word offset to the start of partitions headers |
| 0x14 | Secondary boot device address |
Indicates the address where secondary image is present. This is only valid if secondary boot device is present in attributes |
| 0x1C | Image Header Table Attributes | Refer to Image Header Table Attributes |
| 0x20 | PDI ID | Used to identify a PDI |
| 0x24 | Parent ID | ID of initial boot PDI. For boot PDI, it is same as the PDI ID |
| 0x28 | Identification string |
Full PDI if present with boot header – “FPDI” Partial/Sub-system PDI – “PPDI” |
| 0x2C | Headers size |
0-7: Image header table size in words 8-15: Image header size in words 16-23: Partition header size in words 24-31: Reserved |
| 0x30 | Total meta header length (Word) | Including authentication and encryption overhead (excluding IHT and including AC) |
| 0x34 -0x3C | IV for encryption of meta header | IV for decrypting SH of header table |
| 0x40 | Encryption status | Encryption key source, only key source used for
PLM is valid for meta header. 0x00000000 - Unencrypted 0xA5C3C5A3 - eFuse red key 0xA5C3C5A5 - eFUSE black key 0x3A5C3C5A - BBRAM red key 0x3A5C3C59 - BBRAM black key 0xA35C7C53 - Boot Header black key |
| 0x48 | Meta Header AC Offset (Word) | Word Offset to Meta Header Authentication Certificate |
| 0x4c | Meta Header Black/IV | IV that is used to encrypt the Black key used to encrypt the Meta Header. |
| 0x58 | Optional Data Length (Word) | Size of Optional Data available in Bootloader |
| 0x5C - 0x78 | Reserved | 0x0 |
| 0x7C | Checksum | Inverse of sum of all the previous words as per standard algorithm in the image header table |