Hi Prasad GJ,
About the K66 bootloader, you can refer to our KBOOT2.0, which can be downloaded from this link:
Kinetis Bootloader|NXP
After you download, you can find the K66 bootloader code in folder: NXP_Kinetis_Bootloader_2_0_0\targets\MK66F18
It is the flash bootloader, because K66 don't have the ROM bootloader.
About the command, you can find it from the according document :
NXP_Kinetis_Bootloader_2_0_0\doc
About the peripherals, it has UART, I2C, DSPI, USB_HID, USB_MSC. More details, you can check the code.
Wish it helps you!
If you still have question, please let me know!
Have a great day,
Kerry
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