nRF54H20 reset behavior

All local domain resets trigger a reset of the entire SoC.

nRF Util allows for different types of reset behavior on the various cores of the nRF54H20 SoC, based on the current lifecycle state of the device.

Reset types in LCS EMPTY 

The following is the reset behavior when the LCS of the nRF54H20 SoC is in the EMPTY state:

Reset behavior based on LCS `EMPTY`
Reset kind in LCS `EMPTY`	Reset behavior
`RESET_SYSTEM`	Mapped to the `SYS_RESET_REQUEST` bit as described in the ARM specification for the Application Interrupt and Register Controller. This reset triggers a reset of the Secure Domain, which subsequently resets the entire system. It is available only to the Secure Domain.
`RESET_HARD`	Initiates a reset using the CTRL-AP through the On-Board Debugger (OBD). The register used is `RESET` (address offset: `0x00`).
`RESET_PIN`	J-Link toggles the RESET pin using OBD.
`RESET_VIA_SECDOM`	Not supported.
`RESET_DEFAULT`	Selects `RESET_HARD`.

The following is the reset behavior when the LCS of the nRF54H20 SoC is either in the ROT or DEPLOYED state:

Reset behavior based on LCS `ROT` or `DEPLOYED`
Reset kind in LCS `ROT` or `DEPLOYED`	Reset behavior
`RESET_SYSTEM`	Not supported.
`RESET_HARD`	Initiates a reset using the CTRL-AP through the On-Board Debugger (OBD). The register used is RESET (address offset: `0x00`).
`RESET_PIN`	J-Link toggles the RESET pin using OBD.
`RESET_VIA_SECDOM`	Uses the IronSide SE DEBUGWAIT command to reset the entire system and start the application core in a halted state. To start the application core: `nrfutil device go --core application` To start the radio core: `nrfutil device go --core network` This approach is particularly useful for debugging the application from the reset handler.
`RESET_DEFAULT`	Selects `RESET_HARD`.

To trigger a specific reset type on your nRF54H20 SoC-based device, use the nrfutil device reset command:

nrfutil device reset --serial-number <serial_number> --reset-kind <reset_kind>

For a detailed list of commands for each reset type, run the following:

nrfutil device reset --help

For more information on nrfutil device reset, see nRF Util documentation pages.