Is it possible to distinguish Power-On-Reset from other resets (e.g. watchdog) on P1012? I am looking for some register similar to MPC8270's od MPC5554's RSR.

[martinklonfar]

Is it possible to distinguish Power-On-Reset from other resets (e.g. watchdog) on P1012? I am looking for some register similar to MPC8270's od MPC5554's RSR.

[LPP · Accepted solution]

In general, it is not possible to determine the reason of hard reset. P1012 provide several status registers in Global Utilities block (P1021RM Chpter 20). Though, hard reset is the equivalent of a POR and it clears all the reset status bits.

Software could determine the source of hard reset request as a preliminary if the board system logic doesn't assert (or postpone) HRESET in responce to HRESET_REQ.

If a reset is applied to individual core (not SOC HRESET) then it is possible to determine the source in GUT registers (GUTS_MCPSUMR,GUTS_AUTORSTSR,GUTS_RSTRSCR).

Have a great day,
Pavel

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[jeypatel]

I am using freescale p1020rdb(mpc85xx Arch) board and for watchdog I am using booke watchdog kernel driver.

I want to verify that the board is reset due to "POR" or "Watchdog triggered reset"?

From the reference manual I thought  GUTS_MCPSUMR, GUTS_AUTORSTSR, GUTS_RSTRSCR register should contain the reset reason, however when I printed in  Uboot source code, it was 0 after reset.

How can i find out the reason of the status register not updating.

I am wondering where and how these registers are getting reset???

Am i missing something or need to enable anything else for status register?

Can someone guide me to figured out to verify reset cause in uboot?

Thanks in advance