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AR# 67353

2016.1 AXI DMA: What is the maximum number of descriptors allowed in the bd chain for the Linux AXI_DMA driver?

Description

I am using the Linux driver for AXI DMA from the Xilinx git. What is the maximum number of descriptors allowed?

Solution

The maximum number is 255.

This is limitation in the Xilinx driver. There is an open source driver which implements more than 255 descriptors.

More information can be found in the following link:

https://github.com/Xilinx/linux-xlnx/pull/76

AR# 67353
Date Created 06/09/2016
Last Updated 11/10/2016
Status Active
Type General Article
Tools
  • Vivado Design Suite - 2016.1
IP
  • AXI DMA Controller