Watchdog / AP cores on imx8QM MEK

rkohli2000 — Tue, 15 Sep 2020 21:52:25 GMT

Hi,

The AP (A53/A73) complex in the iMX8QM Ref manual (Rev F) has no mention of WDOG timer.

What is the mechanism to reconfigure/disable/enable/reset the WDOG for the AP complex ?

Is there any example for A53/A72 cores I can reference ? Is the SCU WDOG to be used (is SCU WDOG re-configurable?) ?

Thanks.

Re: Watchdog / AP cores on imx8QM MEK

igorpadykov — Wed, 16 Sep 2020 00:56:17 GMT

Hi rkohli2000

in latest linux wdog driver it is possible to reset A partition (AP complex ), with

arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_SET_WDOG_ACT, SC_TIMER_WDOG_ACTION_PARTITION, 0, 0, 0, 0, 0, &res);

In previous releases with arm_smccc_smc(FSL_SIP_SRTC, FSL_SIP_SRTC_START_WDOG, 0, 0, 0, 0, 0, 0,&res); PMIC WDI was used :

Partition concept is described on

Wdog APIs are described in SCFW Porting Kit

Best regards
igor