KL17 reference manual V4.1 and V5.1 with updated Figure 13-2. Kinetis Bootloader Start-up Flowchart at page 179
There with modification to add "is direct boot valid" check.
Please check below picture for the detailed info:
![pastedImage_1.png pastedImage_1.png](/t5/image/serverpage/image-id/24727i01C3D31F0634C820/image-size/large?v=v2&px=999)
The "is direct boot valid" check function is not supported for KL17 product, the correct flow chart should be below:
![pastedImage_2.png pastedImage_2.png](/t5/image/serverpage/image-id/24647i19BB44EF59E15B38/image-size/large?v=v2&px=999)
The "is direct boot valid" check function is reserved for further parts(such as KL82), which has one bit in BCA filed to control running code in QSPI Flash or internal Flash:
![pastedImage_3.png pastedImage_3.png](/t5/image/serverpage/image-id/24686i876C4B6109E34ED5/image-size/large?v=v2&px=999)
Thank you for the attention.