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imx6q:SDMA  from EIM(FPGA) to DDR

Question asked by jiehuai zhu on Jan 31, 2018
Latest reply on Jul 31, 2018 by yunteng long

 MCU : imx6 

 Kernel : L3.0.35_4.1.0
    - When I use memcopy from ddr to eim(using ioremap), memcopy function is good.
    - So, I think there is no problem with eim settings.
 SDMA test sample : unitest - mxc_sdma_memcopy_test.c sample source
    - mem to mem test is good using sample source. (from DDR to DDR) 
  SDMA firmware version is .1(imx6q)

My plan is data transmission from DDR to EIM(FPGA) using SDMA.
 I changed the address of wbuf or rbuf to EIM address(using  ioremap_nocache to change to virtual memory), but chip select not responding.
 Simply, I just modified the memory address(rbuf->eim virtual address or wbuf->eim virtual address) in the sample source.

But did not succeed