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Commit 890656f0 authored by Gregory Nutt's avatar Gregory Nutt
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Squashed commit of the following: 

    arch/arm/src/imxrt:  Fixes for clean eDMA driver build with Scatter/Gather enabled.
    arch/arm/src/imxrt:  Fixes for clean eDMA driver build with Scatter/Gather disabled.
    arch/arm/src/imxrt:  Add flags to DMA configuration to control transfer setup.  Remove some user interfaces that are inconsistent with modular design.
    arch/arm/src/imxrt:  Update DMA channel interrupt handler.
    arch/arm/src/imxrt:  Add implementation of eDMA imxrt_dmach_start().
    arch/arm/src/imxrt:  Add implementation of eDMA imxrt_dmach_setup().
    arch/arm/src/imxrt:  Add eDMA imxrt_tcd_chanlink().
    arch/arm/src/imxrt:  Add eDMA imxrt_dmach_getcount; free allocated TCDs automatically when the DMA completes or is aborted.
parent 1cf67634
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