Why does OpenCL compiler generates synthesis errors related to Port mismatch while customizing OpenCL Board Support package for Arria10?

Description

While Performing OpenCL import compile, user may experience following errors due to port mismatch

Error (18513): Child partition does not implement output signal which is required by parent partition

Error (18624): Partition contains output port that is ignored by its parent partition

Resolution

In order to compile a kernel as an import, all the global memory ports as well as other added interfaces between static and PR region need to have an additional pipeline stage in kernel_system.qsys

This is automatically done by the OpenCL compiler when specifying addpipe=1 in board_spec.xml.

Here is an example:

<!-- Timestamp SRAM, 64-bit data -->
<global_mem name="TS_SRAM" max_bandwidth="1000" interleaved_bytes="8" config_addr="0x100">   <interface name="board" port="kernel_timestamp" type="slave" width="64" maxburst="1" address="0x200000000" size="0x000000800" latency="25" addpipe="1" />
  </global_mem>