Boot Search Limit

Versal Adaptive SoC Technical Reference Manual (AM011)

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1.6 English

The BootROM has a search limit to locate the device image boot header for every boot mode. If a boot mode search limit is reached without a successful boot, the RCU goes into lockdown and the ERROR_OUT pin is set. The following table lists the boot image search limits for each mode.

Table 1. Boot Search Limit
Boot Mode 1 Search Limit 2
OSPI (single, dual-stacked) 8 Gb (1 GB)
QSPI24 (dual-parallel) 256 Mb (32 GB)
QSPI24 (single, dual-stacked) 128 Mb (16 GB)
QSPI32 (dual-parallel) 8 Gb (1 GB)
QSPI32 (single, dual-stacked) 4 Gb (512 MB)
SD and eMMC 8191 FAT files (default)
eMMC (raw) eMMC device size
  1. 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.
Note: See the Versal Adaptive SoC System Software Developers Guide (UG1304) for PLM fallback/MultiBoot management after a valid boot header is identified by the BootROM.