topic Re: SNVS RTC fault on imx6q in i.MX Processors

SNVS RTC fault on imx6q

lqw39 — Mon, 17 Jun 2013 06:30:55 GMT

Hi,

After changing another batch of imx6q chip, we found android system cannot boot done, it always hang at:

......

I/Zygote ( 2151): ...preloaded 379 resources in 1771ms.

I/Zygote ( 2151): ...preloaded 31 resources in 9ms.

D/dalvikvm( 2151): GC_EXPLICIT freed 29K, 1% free 6467K/6531K, paused 2ms+2ms

D/dalvikvm( 2151): GC_EXPLICIT freed 10K, 2% free 6457K/6531K, paused 1ms+1ms

D/dalvikvm( 2151): GC_EXPLICIT freed <1K, 2% free 6457K/6531K, paused 2ms+2ms

I/dalvikvm( 2151): System server process 2225 has been created

I/Zygote ( 2151): Accepting command socket connections

D/SystemClock( 2225): Setting time of day to sec=86400

W/SystemServer( 2225): System clock is before 1970; setting to 1970.

the batch number with this issue is:

MCIMX6Q6AVT10AC SBCF1315 KOREA YOCFSBU.

the following chip has no problem:

MCIMX6Q6AVT10AC SBAP1250 KOREA XXAPSBV.

[Update] We used RTC stub instead of SNVS for test, and found system can boot up, but run very slowly. It is almost certainly SNVS is going wrong.

Anybody have any ideas?

Thanks.

Re: SNVS RTC fault on imx6q

LinWang — Fri, 21 Jun 2013 08:00:05 GMT

Dear Mr. Liu,

Based on above info which you had provided.

We can't get some conclusion.

Because the different chip batch will not bring any dfiierent.

But I have below suggestions fro you.

1. Please check your SW version, is it latest one and added all patched?

2. Please check power supply status and sequence.(VDDSNVS_IN should power up first.)

Hpoe above info can help you!

Re: SNVS RTC fault on imx6q

lqw39 — Fri, 21 Jun 2013 08:29:32 GMT

Hi Lin,

We have applied all patches listed on website, and use default power sequence of PFUZE100 (same with reference design, official BSP) .

BTW: system does not crash, just halt, and "android" animation still continues

As I know, some batches of i.MX51 chip do not support security RTC module (or shielded?), so customers have to use RTC in PMIC (MC13892); unfortunately, we encountered this situation.

Re: SNVS RTC fault on imx6q

LinWang — Fri, 21 Jun 2013 09:44:25 GMT

Dear Mr. Liu,

Can you show me your schematic?

BTW, I can't understand your below descriptions.

"[Update] We used RTC stub instead of SNVS for test" and "system does not crash, just halt, and "android" animation still continues"

All i.Mx6 chip with SRTC module, you can find related info in Datasheet.

Thanks!

Re: SNVS RTC fault on imx6q

lqw39 — Fri, 21 Jun 2013 14:24:38 GMT

We loaded a simulated RTC driver instead of SNVS RTC driver in kernel, and found system can run normally.

BTW: i.MX515 datasheet says SRTC is supported, but some or all of them shipped into China do not support SRTC, we have confirmed this issue with FAE of WT Microelectronics Co. Ltd, which is one of the Freescale Distributor.

Re: SNVS RTC fault on imx6q

LinWang — Sat, 22 Jun 2013 09:16:06 GMT

Dear Mr. Liu,

Do you mean no issue after using your simulated RTC driver now?

i.Mx6 maybe different i.Mx515, Please confirm i.Mx6 status again.

Thanks!

Re: SNVS RTC fault on imx6q

lqw39 — Mon, 24 Jun 2013 01:54:21 GMT

Yes, android system works well after using simulated RTC driver; but media scanning becomes slow.

We'll check other i.MX6 status.

Thanks.

Re: SNVS RTC fault on imx6q

LinWang — Mon, 24 Jun 2013 02:15:42 GMT

I believe media scaning only related with PLL or PFD clock source, please check if your simulated RTC driver modified related clock source!

Hope you can solve this issue quickly!

Re: SNVS RTC fault on imx6q

YixingKong — Mon, 24 Jun 2013 08:12:24 GMT

Qinggwei, please click Correct Answer/Helpful Answer, if your question has been answered.

Thanks,

Yixing

Re: SNVS RTC fault on imx6q

lqw39 — Mon, 24 Jun 2013 08:22:30 GMT

1. We have confirmed that clock source is right, and the simulated RTC does not change clock settings.

2. We cannot use simulated RTC in product since time cannot be kept after system power down; we MUST make SNVS RTC working.

Some batches of imx6q chip do not support SRTC?

Shall we add new RTC chip into our hardware design?

Re: SNVS RTC fault on imx6q

LinWang — Mon, 24 Jun 2013 08:29:13 GMT

As I know, RTC function is availabe in all i.Mx6 batches.

Please list your BSP version and pach list which you had added.

I will ask our SW engineer to help checking.

Thanks!

Re: SNVS RTC fault on imx6q

lqw39 — Mon, 24 Jun 2013 08:42:29 GMT

We have tried following BSP version:

1. R13.4

2. R13.41 + IMX6_R13.4.1.04_ANDROID_PATCH

3. JB-422_100

and every version have this issue on specific chip.

Re: SNVS RTC fault on imx6q

LinWang — Mon, 24 Jun 2013 08:47:52 GMT

How many chip/board have this issue?

We need conifrm this isn't a single chip/board issue.

Please share your schematic with me.

I like check it at same time.

Re: SNVS RTC fault on imx6q

lqw39 — Mon, 24 Jun 2013 09:00:53 GMT

All of the 10 pcs (with chip SN: MCIMX6Q6AVT10AC SBCF1315 KOREA YOCFSBU) have this issue.

And other boards (with chip SN: MCIMX6Q6AVT10AC SBAP1250 KOREA XXAPSBV) have no issue.

Two kinds of board have no difference except i.mx6q chip.

We used the same design with SDP board.

Thanks.

Re: SNVS RTC fault on imx6q

LinWang — Mon, 24 Jun 2013 09:19:55 GMT

After checking with SW guy, our latest BSP is JB4.2.2_GA.

Please help to update to new version.

Your version is very old.

Re: SNVS RTC fault on imx6q

lqw39 — Tue, 25 Jun 2013 01:36:33 GMT

I am puzzled with your info!

We have tried:

3. JB-422_100 (IMX6_JB422_100_ANDROID_SOURCE)

Which is the latest version in your website.

Do you have the updated version which is not published?

Please let me know the link, thanks.

Re: SNVS RTC fault on imx6q

LinWang — Tue, 25 Jun 2013 01:36:45 GMT

Please try latest BSP.

let me know the result.

Thanks!

Re: SNVS RTC fault on imx6q

lqw39 — Tue, 25 Jun 2013 01:40:45 GMT

As I said above, we have tried the latest version we can get from website.

If you have newer version, please give me the link.

Thanks.

Re: SNVS RTC fault on imx6q

RobinGong — Tue, 25 Jun 2013 01:58:31 GMT

It seems your chips were not programmed with right fuse bit. Can you type "imxotp read 4" and let me know the value in u-boot ?

Re: SNVS RTC fault on imx6q

LinWang — Tue, 25 Jun 2013 02:00:36 GMT

Sorry, I miss your latest important info!

Suggestions:

1. Find a FSL domo board and mount issue chip "1315" on it an test.

2. Find local FSL support for help.

Would you please show your company's name and office location to us?

Thanks!