The following page provides an example of setting the current I/O configuration to persist across reboots.
Setup
So you’ve reviewed the I/O capabilities (/ list|io_caps), and decided which I/O should be configured as which protocol (/ set|io_type_cfg(…) or $ set_io_type_cfg(…, …)).
You now want this configuration to persist across reboot cycles. This task is straightforward, simply:
Enter command mode.
$ command
Save the current I/O configuration as default
/ set|start_on_boot_io_cfg
Power cycle the device unplug-plug, press the reset button, or run either of the following:
/ run|reboot
/ exit $ reboot()
Enter command mode.
$ cmd
Confirm the I/O configuration has persisted:
/ list|io_type_cfg
The same will apply to any related configuration (UART baud, SPI clock frequency, etc).