From mboxrd@z Thu Jan 1 00:00:00 1970 From: nicolas.ferre@atmel.com (Nicolas Ferre) Date: Fri, 15 May 2015 16:19:25 +0200 Subject: at91sam9: watchdog: period In-Reply-To: References: <55559D55.6020703@aksignal.cz> Message-ID: <5556006D.30306@atmel.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Le 15/05/2015 15:59, Bryan Evenson a ?crit : > Jiri, > >> -----Original Message----- >> From: linux-arm-kernel [mailto:linux-arm-kernel- >> bounces at lists.infradead.org] On Behalf Of Jir? Prchal >> Sent: Friday, May 15, 2015 3:17 AM >> To: linux-arm-kernel at lists.infradead.org >> Cc: Boris Brezillon; Jean-Christophe Plagniol-Villard; Nicolas Ferre >> Subject: at91sam9: watchdog: period >> >> Hi all, >> I'm trying to discover what's wrong with watchdog on my board. I didn't find >> anything about it on internet so I would ask you for help. >> I have a board with sam9g25 and slow clock xtal 32768Hz with 10p capacitors >> to GND. Frequency seems to be good since hwclock (RTC) runs pretty >> precisely powered from backup and main power too (no NTP). But watchdog >> time to reset is still 61s regardless default (16s) or 4s heartbeat setting. No >> change to WDT_MR in bootstrap, so in Linux should work. > > I have the same hardware setup and the watchdog timeout is 15 > seconds for me. For my kernel, I am using the Atmel fork at > github.com/linux4sam/linux-at91, master branch at commit > 5d5b332821753d616e65da6237f0a3330e59b98f. FYI, I've just moved the master branch of our github to the newer 3.18-based branch: linux-3.18-at91. Bye, > Even though this is based upon > the 3.10 kernel, there isn't much that has changed with regard to the > RTC or watchdog between 3.10 and 4.03; Atmel has been good on > backporting their changes to their fork. Maybe try an older kernel and > see if the problem goes away? > > > Regards, > Bryan > >> Here is dump: >> [ 0.000000] Booting Linux on physical CPU 0x0 >> [ 0.000000] Linux version 4.0.2_cpm9g25 (prchal at prchal) (gcc version 4.7.3 >> (Ubuntu/Linaro 4.7.3-12ubuntu1) ) #10 >> PREEMPT Thu May 14 15:20:24 CEST 2015 >> [ 0.000000] CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), >> cr=0005317f >> [ 0.000000] CPU: VIVT data cache, VIVT instruction cache >> [ 0.000000] Machine model: AKsignal CDU9G25_v6 >> [ 0.000000] Memory policy: Data cache writeback >> [ 0.000000] AT91: Detected soc type: at91sam9x5 >> [ 0.000000] AT91: Detected soc subtype: at91sam9g25 >> ... >> [ 4.669669] AT91: Starting after watchdog reset >> [ 4.675675] at91sam9_wdt: enabled (heartbeat=4 sec, nowayout=1) >> ... >> >> / # killall watchdog >> [ 1821.114114] watchdog watchdog0: nowayout prevents watchdog being >> stopped! >> / # [ 1821.123123] watchdog watchdog0: watchdog did not stop! >> [ 1882.294294] at91sam9_wdt: I will reset your machine ! >> >> Thanks for any help. >> Jiri >> >> _______________________________________________ >> linux-arm-kernel mailing list >> linux-arm-kernel at lists.infradead.org >> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel > > -- Nicolas Ferre