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: For smaller devices, the BootROM
wraps around to zero and continues again till it reaches the stated search offset
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.