little problem in understanding MODULAR sgDMA ?

hello all,

I have created a SoC in platform designer which have a modular SG-DMA. I have a confusion on what to pass the arguments while using HAL API function calls.

ex: alt_msgdma_standard_descriptor_async_transfer( argument 1 , argument 2);

argument 1 : it is simply a pointer to msgdma instance (i have clarity on this)

argument 2 : <alt_msgdma_standard_descriptor *desc> which says *desc : a pointer to a standard descriptor structure.

In the address editor of qsys tool , descriptor port of msgdma has 0x0208_1040 address.

what should i give in this argument 2. ???

The same confusion while using another API : alt_msgdma_construct_standard_mm_to_mm_descriptor (arg1,arg2,arg3,arg4,arg5,arg6);

arg1 : device instance

arg2 : a pointer to a standard descriptor structure (????)

arg3 : read_address

arg4 : write_address

arg5 : length

arg6: control

coming to hardware part, It has nios, ocm,msgdma, myown 4kb memory (burst capable) acts as source, another instance as destination.

I am attaching c file and as well as qsys IP integration.

my questions are

1. am i missing any other function call

2. how to use the arg2 as i asked above.

3. any fundamental mistake is there in my SoC ,please check zip file.

please somebody help me to sort out this issue.

Hope this will resolve this time at-least.

Thanks

Anil