What is the preferred/recommended method of transferring data between the HPS and the fabric?

Moderator · April 25, 2026, 11:01am

For high-bandwidth data transfer between the HPS and FPGA fabric, it is recommended to use mSGDMA or PCIe-based DMA, depending on the application requirements.

Please find the mSGDMA Linux driver details from the following link:

Altera recommends using mSGDMA for new designs. Please find a few additional reference links shared by Altera.

mSGDMA core overview:

Project demonstrates how to access HPS Memory via the FPGA to HPS bridges when the HPS is running Linux:

Please refer below for mSGDMA driver:

github.com/altera-fpga/linux-socfpga

drivers/dma/altera-msgdma.c

socfpga-6.6.22-lts

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * DMA driver for Altera mSGDMA IP core
 *
 * Copyright (C) 2017 Stefan Roese <sr@denx.de>
 *
 * Based on drivers/dma/xilinx/zynqmp_dma.c, which is:
 * Copyright (C) 2016 Xilinx, Inc. All rights reserved.
 */

#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/dmapool.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/platform_device.h>

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Please find the detailed product information here:
Agilex™ 7 (R31A/R31B/R31C) SoC FPGA System on Module