The BootROM has a search limit to locate the device image boot header for every boot mode. The following table lists the boot image search limits for each mode.
| Boot Mode | Search Offset Limit |
|---|---|
| OSPI (single, dual-stacked) | 8 Gb |
| QSPI24 (dual-parallel) | 256 Mb |
| QSPI24 (single, dual-stacked) | 128 Mb |
| QSPI32 (dual-parallel) | 8 Gb |
| QSPI32 (single, dual-stacked) | 4 Gb |
| SD0 (3.0), SD1 (2.0), SD1 (3.0), or eMMC1 | 8191 FAT files (default) |
| 8191 FAT files (default) | eMMC device size |
Note: When using OSPI
or QSPI dual-stacked mode, the BootROM can only access the lower QSPI or OSPI
addressable flash memory space for boot. After boot, the PLM can access the upper QSPI
or OSPI for additional image storage