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Old 11-07-2019, 10:43 PM   #1
Arul Jeniston
LQ Newbie
 
Registered: Nov 2019
Posts: 1

Rep: Reputation: Disabled
how to find last reboot caused by TCO watchdog


hi Team,

We use intel TCO hardware watchdog to recover the system from unexpected software hangs and hardware issues.
We have a requirement to show TCO watchdog caused last reboot.
Intel spec says, TCO1_STS and TCO2_STS register has the bits set if watchdog resets the CPU. We do observe the same in our testing.
But during iTCO driver initialization in iTCO_wdt_probe(). This puts a limitation in reading the reason for previous reboot.

- Is there any other way to find previous reboot caused by watchdog?

- Can be the value of TCO_STS registers saved in RAM before clearing it? This would help us to find that the cpu was reset by watchdog during previous run.

static int iTCO_wdt_probe(struct platform_device *pdev)
{
...
...
switch (p->iTCO_version) {
case 5:
case 4:
outw(0x0008, TCO1_STS(p)); /* Clear the Time Out Status bit */
outw(0x0002, TCO2_STS(p)); /* Clear SECOND_TO_STS bit */
break;
case 3:
outl(0x20008, TCO1_STS(p));
break;
case 2:
case 1:
default:
outw(0x0008, TCO1_STS(p)); /* Clear the Time Out Status bit */
outw(0x0002, TCO2_STS(p)); /* Clear SECOND_TO_STS bit */
outw(0x0004, TCO2_STS(p)); /* Clear BOOT_STS bit */
break;
}

Thanks and Regards,
Arul
 
  


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