AXI DMA in scatter-gather mode from Linux kernel. It is used to run as a Linux program.
PYNQ doesn’t support scatter gather functionality of the DMA.
Apr 27, 2017 · Zynq AXI DMA transfer with Scatter/Gather.
This. 7 EDK, AXI Ethernet - How do I send multiple packets with AXI DMA scatter/gather? Number of Views 207. g.
PYNQ only supports DMA from contiguous memory buffers.
For AXI-ST, things get weird, and the source code is far from orthodox. . Internally, a multichannel DMA engine is usually present in the device to perform multiple concurrent scatter-gather operations as programmed by the software.
A mmapped file can be treated as a buffer (shared between the kernel and the user) that is "DMA-able" if the NIC supports scatter gather DMA. For a full description of DMA features, please see the hardware spec.
Scatter-Gather can be enabled on the DMA to allow transfers greater than 8MB (from contiguous memory buffers).
This is where data can be transferred from fragmented or disjointed memory locations. Programmable interrupt coalescing for SGDMA.
. In this system, a AXI CDMA instance acts as a master device to copy an array of the data from the source buffer location to the destination buffer location in the DDR system memory.
My current PL design is pretty simple PS -> DMA(MM2S) -> DMA (S2MM) -> PS.
The DMA controller is the PL330 one that supports the DMAengine API (see PL330 DMA controller).
. This is where data can be transferred from fragmented or disjointed memory locations. 57028 - EDK 14.
. Step 2: Create the HDL wrapper and then run synthesis, implementation and generate the bitstream. This. NIC without SG support, the data copies are. axidma Documentation.
In contrast to other examples it makes no usage of the Xilinx Linux drivers, so there is no need to recompile your kernel from linux-xlnx.
The DMA controller is the PL330 one that supports the DMAengine API (see PL330 DMA controller ). e.
Scatter-Gather can be enabled on the DMA to allow multiple transfers of up to 8,388,608 bytes (from contiguous memory.
The node references the AXI DMA channels in the project.
AXI Central DMA Controller.