Hi Shawn,
I think you are using Kinetis Bootloader with below link:
http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=KBOOT
You could find the <bootloader_config.h> at below default path:
C:\Freescale\FSL_Kinetis_Bootloader_1_0_2\targets\k64f12\src
Wish it helps.
best regards
Ma Hui
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