In a system-reset, the entire hardware, both PS and PL are reset. After system reset is released, PS executes the standard boot process starting from the PMU ROM, followed by CSU ROM, then FSBL and so on. The following table shows the differences between system reset and POR:
| POR | System Reset |
|---|---|
| Reset persistent registers | Preserves persistent registers |
| Resamples boot mode pins | Does not resample boot mode pins |
| Reset debug states | Preserves debug states |
| Resample eFuse values | Requires explicit software action to refresh |
| Security state determined | Security state locked |
| Clear tamper response | Preserves tamper response |
| Select security key source | Security key source locked |
| Optional LBIST and/or SCAN/CLEAR | Does not run LBIST or SCAN/CLEAR |
| Run MBIST | Explicit software action needed to run MBIST |
System reset can be initiated by Linux command or watchdog timeout or PMU error management block. If you are interested in only System reset without APU/RPU subsystem restart, subsystem/isolation configuration is not required.
Note: System reset is not supported in qspi24 mode on systems with a flash size that is
greater than 16 MB.