Perform the following to avoid an FPD lockout, where FPD Power is applied
momentarily:
- Apply the power until the completion of bootROM execution.
- To power down the FP during FSBL execution, set FPD bit '22' of PMU_GLOBAL REQ_PWRDWN_STATUS register.
- To bring the FP domain up in a later stage of the boot process, set the PMU_GLOBAL REQ_PWRUP_STATUS bit to '22’.
Perform the following in cases where the FPD power is not applied before the FSBL boots
- Power up the R5.
- A register is set indicating the FPD is locked pending POR as the reset or clear sequence cannot execute on the FPD.
- R5 can read the FP locked status from PMU_GLOBAL REQ_ISO_STATUS register bit ‘4’.
- At this stage, PMU_GLOBAL REQ_PWRUP_STATUS bit '22' will not be set.
- To bring the FPD node back up, power must be supplied to the node and a POR needs to be issued.