How does the KW47 ROM Bootloader decide which image is newest?

manuvs014 — Wed, 03 Jun 2026 06:41:41 GMT

Hi NXP Team,

I am working on the KW47 dual-image boot / OTA update concept, and I would like to clarify how the ROM bootloader selects the newest image during boot.

From my understanding, in a dual-image setup we may have two valid application images in internal flash, for example:

Primary Image -> Address configured by Boot Image Base Address in ROMCFG / IFR0
Secondary Image -> Address configured by FLW region / ABASE in ROMCFG / IFR0

During reset, the ROM bootloader checks both images and decides which one should be booted.

My doubt is mainly about this point:

How does the KW47 ROM bootloader know which image is newer?

topic How does the KW47 ROM Bootloader decide which image is newest? in Kinetis Microcontrollers

How does the KW47 ROM Bootloader decide which image is newest?