In this step, the Vitis compiler takes any Vitis compiler kernels (RTL or HLS C) in the PL region of the target platform (xilinx_vck190_base_202320_1) and the AI Engine kernels and graph and compiles them into their respective XO files. The following commands compile the kernels (default TARGET=hw_emu, GEMM_INSTS=1, GEMM_SIZE=32, ITER_CNT=1 and EN_TRACE=0).
make kernels
The command alongwith the options used is as follows (for dma_hls):
$(BUILD_TARGET_DIR)/$(DATAMOVER_KERNEL_XO).xo:
mkdir -p $(BUILD_TARGET_DIR); \
cd $(BUILD_TARGET_DIR); \
v++ --target $(TARGET) $(DATAMOVER_KERNEL_VPP_FLAGS) \
$(VPP_FLAGS) -c -k $(DATAMOVER_KERNEL_TOP) \
$(DATAMOVER_KERNEL_SRC) -o $@
See this page for a detailed description of all Vitis compiler switches. The following table provides a summary of the switches used.
| Switch | Description |
|---|---|
| --target | -t [hw|hw_emu] | Specifies the build target. |
| --platform | -f | Specifies the name of a supported acceleration platform as specified by the $PLATFORM_REPO_PATHS environment variable or the full path to the platform XPFM file. |
| --save-temps | -s | Directs the Vitis compiler command to save intermediate files/directories created during the compilation and link process. Use the --temp_dir option to specify a location to write the intermediate files to. |
| --temp_dir |
This allows you to manage the location where the tool writes temporary files created during the build process. The temporary results are written by the Vitis compiler, and then removed, unless the --save-temps option is also specified. |
| --verbose | Display verbose/debug information. |
| --compile | -c | Required for compilation to generate XO files from kernel source files. |
| --kernel \<arg>|-k \<arg> | Compile only the specified kernel from the input file. Only one -k option is allowed per Vitis compiler command. |
| --output | -o | Specifies the name of the output file generated by the V++ command. The DMA HLS kernels output should be XO. |
| Input | Description |
|---|---|
| $(PL_SRC_REPO)/dma_hls.cpp | Defines the data mover PL kernel. |
| Output | Description |
|---|---|
| $(BUILD_TARGET_DIR)/dma_hls.hw_emu.xo | The data mover kernel object file. |