System time jumps to 131072 sec ahead suddenly

Masaki Mukawa

Prodigy 80 points

Other Parts Discussed in Thread: AM3352, AM3517, AM3358

Hi,

Now I'm implement software on our custom board which uses AM3352.

SDK version is linux-3.2.0-psp05.06.00.00.

I have encounterd problem that Linux system time jumps "131072 second future" suddenly.

The reproducibility is 1,2 times per day.

I added debug log to do_sys_settimeofday() in /linux-3.2.0-psp05.06.00.00/kernel/time.c

But any log is not appeared when problem happened, .

I was able to find that similar issue is reported in forum (which subject is "AM3517 time jump"),but I couldn't find that answer.

Does anyone know about this problem?

Best Regards,

Mukawa

over 10 years ago

0 IGNACIO REDONDO over 10 years ago

Intellectual 270 points

Hi,

I am running Ubuntu 11.10 GNU/Linux 3.2.30-psp23 armv7l on a beaglebone based design with AM3358, and I have exactly the same problem. The system time jumps 131072 seconds 1 or 2 times a day. I haven't resolved this issue yet and for the moment I am synchronizing the system time using ntpdate every 5 minutes. Does anyone know how to solve it? I'd really appreciate some help on this.

Best Regards,

Ignacio

0 Masaki Mukawa over 10 years ago in reply to IGNACIO REDONDO

Prodigy 80 points

Hi Ignacio

According to TI Japan, this issue is caused by that clock source is different. system clock source is selectable. if there is arch/arm/mach-omap2/timer.c in your psp, i recommend to modify clock source changa as follows and try to test it again.

//OMAP_SYS_TIMER_INIT(3_am33xx, 2, OMAP4_MPU_SOURCE, 1, AM33XX_RTC32K_SOURCE)
OMAP_SYS_TIMER_INIT(3_am33xx, 2, OMAP4_MPU_SOURCE, 1, "clk_32khz_ck")

My issue was resolved by this fix.

Best Regards,

Mukawa

0 takeshi matsuzaki over 8 years ago in reply to Masaki Mukawa

Expert 2030 points

Hello,

Sorry for making you remenber this, but my cuntomer is facing with the same problem.
My cuntomer's product runs on AM335x+linux-3.2.0-psp04.06.00.11, and System time jumps to 131072 sec.
This phenomenon occurs very rarely, so we can't reproduce it.

Seeing this post and other posts related to this phenomenon,
e2e.ti.com/.../280122
some workarouds(change the clock source or add patchs..) are written but the cause of the problem
isn't described clearly.

Do you know the real cause of the problem ?

Regards,
Takeshi Matsuzaki

0 takeshi matsuzaki over 8 years ago in reply to takeshi matsuzaki

Expert 2030 points

Any reply ?

Regards,
Takeshi Matsuzaki

0 Pavel Botev over 8 years ago in reply to takeshi matsuzaki

TI__Guru**** 170625 points

The system time jumping forward in time was observed due to the problem described in AM335x Silicon errata Advisory 1.0.30.

Refer to the below e2e threads:
e2e.ti.com/.../417299
e2e.ti.com/.../418202
e2e.ti.com/.../394031
e2e.ti.com/.../303825
e2e.ti.com/.../308616

Regards,
Pavel

0 takeshi matsuzaki over 8 years ago in reply to Pavel Botev

Expert 2030 points

Hi Pavel,

OK, I understand. thanks.

Regards,
Takeshi Matsuzaki

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System time jumps to 131072 sec ahead suddenly