8.2 Multi-Stage Boot Example

The multistage boot example demonstrates two stage booting the K2 devices using functions in BootROM call table. The first stage is loaded from the boot media specified by the boot switches using default bootROM parameter tables. The first stage code replaces the default fields in the boot parameter table and re-enters boot to load the second stage. This process is used in-order to modify the default boot process in cases where you need to speed up the boot speeds, boot from a different offset in the flash memory, load code into DDR memory or to perform time critical application specific initialization that may be required without waiting for the entire application to load. The second stage initializes wakes up secondary Arm core and initializes the UARTs and prints messages when each Arm core wakes up.

For details regarding the organization of the boot image for specific boot mode, see the makefile in the path examples/<device>/<peripheral>/multiStage.