Is your enhancement proposal related to a problem? Please describe.
Refer to: zephyrproject-rtos/zephyr#28932

Describe the solution you'd like
Refer to: zephyrproject-rtos/zephyr#28932 (comment)

Describe alternatives you've considered
NA

Additional context
NA

With Tock running on this board with virtual_uart sitting on top of USB, the Nano 33 BLE is a reasonably promising board to be a standard, well supported Tock board. Additionally, if the board turns out to not be great, the infrastructure which would make the Nano 33 BLE work well would apply to any other board that has the nRF52840 + USB combination.

• Make the bootloader and tockloader ex

Hi,

This is a really esoteric issue, but I was looking through the code and found this line: https://github.com/adafruit/circuitpython/blob/e6dc3e4686c74ad1828d07475194fc45e8f65ab0/ports/atmel-samd/common-hal/analogio/AnalogOut.c#L87

However, in the datasheet here: https://ww1.microchip.com/downloads/en/DeviceDoc/SAM_D21_DA1_Family_DataSheet_DS40001882F.pdf

Section 47.6.3 does not exist (

In PROTECTED mode, the MPU is used to map regions of memory to supervisor- and/or user-accessible memory. Currently, that algorithm is very simple: The entire address range is made accessible in supervisor mode; a single MPU region is used to enable user-mode access in each user memory region.

Each MPU region must bit both of a power-of-two size and with an alignment in memory equal to the si