About AM335x Date Issue

Hi Sir

thanks for your reply.

But my question is that why the time will go back to previous time ? 

for example:

The Jan 1  05:27:37

in 1 minute

The Jan 1 05:26:27

BR

Yimin

Hi Sir

thanks for your reply and we have checked this already.

  1.this scenario will happen after the machine runs in more than 4 fours or more 

  2. we use AM3352BZCE package and check the schematic as below 

we have connected VSS_OSC to ground alreay. 

Do you have other suggestion and thanks in advance.

BR

Yimin

Hi Sir

we use AM3352 ZCE package with RTC feature disabled design.

and follow your suggestion as below 

1.Try replacing FB1 with 0 Ohm resistor

2. change the reference clock as below

--- a/arch/arm/mach-omap2/timer.c

+++ b/arch/arm/mach-omap2/timer.c

@@ -420,7 +420,7 @@ OMAP_SYS_TIMER(3)

 OMAP_SYS_TIMER_INIT(3_secure, OMAP3_SECURE_TIMER, OMAP3_CLKEV_SOURCE,

                        2, OMAP3_MPU_SOURCE)

 OMAP_SYS_TIMER(3_secure)

-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, OMAP4_MPU_SOURCE)

 OMAP_SYS_TIMER(3_am33xx)

 #endif

But the system time still jump and log message is showed as below

# date; echo "[ pc: Sat, 02 Apr 2016 04:03:03 +0800" ]
Thu Jan 1 10:18:09 UTC 1970
# date; echo "[ pc: Sat, 02 Apr 2016 04:03:08 +0800" ]
Thu Jan 1 10:18:14 UTC 1970
# [37071.290566] am335x_wdt_function():158, count: 37097, Now:(1970-01-01 10:20:50), Last:(1970-01-01 10:18:14)
[37071.305343] ttyO0: 1 input overrun(s)
date; echo "[ pc: Sat, 02 Apr 2016 04:03:13 +0800" ]
Thu Jan 1 10:20:50 UTC 1970
# date; echodate; echo "[ pc: Sat, 02 Apr 2016 04:05:48 +0800" ]
Thu Jan 1 10:20:54 UTC 1970

Do you have other suggestion ?

BR

Yimin