Hi
K66 is still a big problem and I don't know where to obtain them from apart from some brokers, although they can charge up to $900 for each chip it seems. In addition I have had a case where the chip was not the one written on the package but a similar one without Ethernet inside, so it is a risk too!
The uTasker serial loader for iMXRT can be encrypted (and clone protected) with almost zero effort. There are guides and videos at
https://www.utasker.com/iMX/developers.htmlThe uTasker project includes all encrypting tools so it is much simpler than the NXP method (which is a one-time usable key method). The key used in every chip is different (randomly generated) and doesn't need to be known/managed by the user. It won't interfere with the NXP encryption method if that were used on the same chip and the HW can be reused with different projects since the project key is still replaceable.
Each time the uTasker reference project is build it automatically generates plain code and encrypted outputs (you can simply tell it which project key you want to use to personalise it) and so there is almost no effort involved.
Note that the chip shortage has resulted in the uTasker project investing in the following chips, which are reserved for uTasker users and available at reduced prices (in comparison to distributors):
IMXRT1062DVL6B - commercial
IMXRT1062CVL5B - industrialThese are 10mmx10mm 196 pin BGA with full features (2 x Ethernet, 2 x USB ,1Meg RAM, TFT display interface) and footprint compatible (and code 99% compatible) with i.MX RT 1051/52/61/62 and are useful for porting Kinetis projects to (they can also be used in place of i.MX RT 1064 as long as there is a QSPI flash connected)). With 600MHz zero wait state operation (up to 1.2G instructions per second) they are FAST as well. As well as having very high compatibility with Kinetis the uTasker project makes it simple to port from Kinetis projects and, with the chip stock, can ensure that supplies are immediately available when needed (some parts still have over a year delivery time otherwise).
There are good stocks available for immediate delivery or reservation, whereby each new project can order/reserve up to 1'200 pieces at the moment. (Quantities of up to 10'000 are possible for immediate delivery but only under exceptional circumstances since it is preferred to supply as many new projects as possible).
Regards
Mark
P.S. The encryption used on the SD card is compatible with the boot loader encryption and is there is no conflict. The encrypted SD card content is simply copied and store in the QSPI flash in the same format.
P.P.S. I will make a post repeating the 1062 details since it hasn't generally been advertised here before.