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DM814x and UART DMA Transfers

Stephen Marchetti
Prodigy 250 points


I just noticed that the DMA engine is currently not being used in Linux PSP 04.01.00.06 For the UART.  Is there plans to add this code or is there issues with this? 

 

 

  • 0
    TI__Expert 5660 points

    Hi,

    DMA mode is currently not supported in the DM814x serial driver even though it uses omap-serial driver. (DMA is currently switched off for DM814x).

    Default OMAP serial driver uses SDMA (OMAP3 DMA) to implement DMA functionality. (drivers/tty/serial/omap-serial.c)

    But DMA engine is different in DM814x (EDMA vs SDMA in OMAP3).

    There is already an existing wrapper to convert SDMA to EDMA APIs but this is not validated yet with UART driver. (currently only SD/MMC driver uses this wrapper).

    UART DMA support  is not currently planned.

    Regards,

    Nageswari