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AM3352: UART3 RS485 repeat first byte patch

Tony Tang
Mastermind 30272 points

Part Number: AM3352

From this URL: https://github.com/RobertCNelson/bb-kernel/issues/65

upload a patch to resolve this issue. 

but draw back in new Kernel.

What is background, should or should not apply the patch.

customer use SDK 4.3, Kernel 4.9, after applied the patch, the issue disappeared, but not sure if it will introduce other issue

  • 0
    TI__Guru**** 177891 points

    Hi Tony,

    I will review this next week and get back to you.

  • 0
    TI__Guru**** 177891 points

    Hi Tony,

    I spent some time on the internet, it appears the kernel community had a long discussion about this patch and eventually it got reverted because it breaks the UART on another platform. But I didn't find any other follow-up solution to the mentioned AM335x RS485 issue.

    I think you you have two options:

    1. test with the latest SDK8.2 to see if the RS485 issue still exists. If not, migrate to the new kernel;

    2. continue to use SDK4.3 but apply this patch, but run through UART test to ensure nothing else is broken.