AM5748: Alternative workaround for i940

Kanae

Part Number: AM5748

Hi Support Team,

Regarding the errata; i940 MPU COUNTER_REALTIME saturates after several hundred days,
I referenced the following thread, but all workarounds are currently unavailable for application on my customer's system.

e2e.ti.com/.../faq-am5748-am57xx-mpu-counter_realtime-saturates-after-several-hundred-days

From the above thread, it appears that there are no other workarounds that can be suggested,
but are there any alternatives currently in the same status?

If so, are there any plans to fix it when the next silicon revision is released?
In the event that it is fixed, when is the timing expected to be?

Best regards,
Kanae

over 3 years ago

0 Keerthy J over 3 years ago

TI__Guru**** 162770 points

Hi Kanae,

Workaround patches are shared in the E2E link you have mentioned above: https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1041234/faq-am5748-am57xx-mpu-counter_realtime-saturates-after-several-hundred-days

5.4 Kernel backports:

https://patchwork.kernel.org/project/linux-omap/patch/20210602104625.6079-1-tony@atomide.com/
https://patchwork.kernel.org/project/linux-omap/patch/20210602104625.6079-2-tony@atomide.com/
https://patchwork.kernel.org/project/linux-omap/patch/20210602104625.6079-3-tony@atomide.com/
https://patchwork.kernel.org/project/linux-omap/patch/20210602104625.6079-4-tony@atomide.com/

5.10 kernel backports:

http://lkml.iu.edu/hypermail/linux/kernel/2105.2/00585.html
http://lkml.iu.edu/hypermail/linux/kernel/2105.2/00586.html

Even 4.19 patches are attached there.

Kanae said:
If so, are there any plans to fix it when the next silicon revision is released?

No plans.

Closing this issue.

- Keerthy

0 Kanae over 3 years ago in reply to Keerthy J

Guru 10085 points

Hi Keerthy,

Thank you for your reply.
Customer is very difficult to deal with in all workarounds on their system.
As TI, could you please give advice on how to improve this situation for customer.

Best regards,
Kanae

0 Keerthy J over 3 years ago in reply to Kanae

TI__Guru**** 162770 points

Hi Kanae,

There is no plans for fix in the hardware. It was by design. The software work around is used by all the customers who faced the COUNTER_REALTIME issue. So kindly share them the E2E with the patches for workaround.

Closing this thread.

Best Regards,
Keerthy

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AM5748: Alternative workaround for i940