[meta-xilinx] Yocto on Zynq. How to include Xilinx DMA driver

[Fan Zhang]

Hi All,

I'm quite new to Yocto, and Linux driver. I have a design on Zynq that 
uses DMA, and I need to setup a driver to program the DMA controller, 
setup the data transfer and supply data to user space.

I searched around in the Xilinx forum, and found an dma_proxy driver, 
and Xilinx provides an xilinx_dma.c driver for the DMA. It is unclear to 
me how these all fit together. I have a few questions and I appreciate 
anyone to give me some pointer to moving things forward.

1. How to include xilinx_dma.c driver in to the poky image build?

    Xilinx wiki says enable these options: CONFIG_DMADEVICES,
    CONFIG_XILINX_DMA. I did a search on my bitbake folder, and they are
    enabled in a number of cfg files. But checking the environment with
    bitbake -e , and these options didn't show up in there. I can't find
    any xilinx_dma.ko in the build either. So what am I missing, and how
    can I include the xilinx driver into my build? Xilinx wiki page is
    here: http://www.wiki.xilinx.com/DMA+Drivers+-+Soft+IPs

2. I found a set of character device based dma driver, and it's user 
space application example. A number of people refer to this solution as 
an starting point for driver development. It's unclear to me whether 
this driver is built on top of the Xilinx_dma driver. When I tried this 
driver, it fails at requesting DMA channel. Anyone has experience with 
this driver, could you share your experience? Thank you so much.

    Driver can be found here:
    https://bitbucket.org/Schnegg/pa/src/b8f430a3ebd756f231e88e5dc8523737ed5db034/petalinux_project/components/modules/dma_proxy/dma_proxy.c?at=master&fileviewer=file-view-default

Best Regards,

Fan
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