Version: Vitis 2023.2
Some of the recent Xilinx Platforms have an XDMA feature to bypass the DMA operation and allow the kernels to directly access the host memory. The direct host memory access provides an alternate data transfer mechanism compared to XDMA based data transfer and can be useful in some of the scenarios.
Custom kernel developers can use their already developed DMA engine as part of their kernel design. This specifically helps RTL kernel developers who are looking to reuse existing DMA IP.
A platform can be designed even without an XDMA, such as the latest U50-NoDMA platform, providing a thin fixed logic with more available FPGA resources for the user logic or kernels.
The data transfer burden can be freed from the host server. As a result, the host can spend time on other tasks that might even help in overall application performance.
For more details about the host memory access feature, refer to HM in XRT documentation.