Is it possible in KBOOT 2.0 to use a flashloader project designed for the target chip MK22F12810, program it into a MK22F51212 chip, and use it as a bootloader for MK22F51212 projects?

[brendanmerna]

The evaluation board I'm using has a MK22F12810 chip on it. We were having some issues bootloading with this until we made some modifications and got it working. Our production boards will have the MK22F51212 chip on them and I'm wondering if this same project can be used.

[brendanmerna · Accepted solution]

Figured out my problem to this. We were using USB program as the application program to be bootloaded. The bootloader was working correctly, but because of a timing error between the bootloader jumping to the application code, the USB hub wasn't enumerating correctly. It seemed like the bootloader had messed up the code, but it was simply stuck trying to find the hub. Solution was to has some delays at the start of the application code, so the hub could enumerate correctly.

[kerryzhou]

Hi Brendan Merna,

   I have test the MK22F12810 flash bootloader in the TWR-K22F120M board.

NXP_Kinetis_Bootloader_2_0_0\targets\MK22F12810

  It works OK, the chip on TWR-K22F120M is MK22FN512VMC12.

Please check your K22F51212, if the chip you are using is these chip:

MK22FN512VDC12, MK22FN512VLL12,
MK22FN512VLH12, MK22FN512VMP12, MK22FN512VFX12,
MK22FN512CAP12R, MK22FN512CBP12R, MK22FN256CAP12R

You can use the official KBOOT2.0 K22 bootloader directly.

Wish it helps you!

Have a great day,
Kerry

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[brendanmerna]

Hey Kerry,

My project is also a KSDK 2.0 project. I've gotten the bootloader to enumerate and flash, but the result of this flashing seems to put the micro in a bad state. I've followed the document "How to adapt KDS applications for KBOOT bootloader", but I noticed its only valid up to KSDK 1.2. Is there another doc on creating a bootloadable KSDK 2.0 project?

-Brendan

[kerryzhou]

Hello Brendan,

   About the document for KBOOT2.0, please find it from this folder: NXP_Kinetis_Bootloader_2_0_0\doc

   You can read Kinetis Bootloader v2.0.0 Reference Manual.pdf.

Wish it helps you!

Any updated question, just let me know!

Have a great day,
Kerry

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