This page provides an overview of unsupervised AMP configurations for both Zynq-7000 and Zynq UltraScale+ MPSoC.

Table of Contents

Unsupervised AMP

Unsupervised AMP refers to a concept where multiple operating systems or bare-metal applications run on individual CPU cores within a CPU-core cluster without an underlying hypervisor. Additional description can be found at OpenAMP GIT

Developers hope that these unsupervised solutions will be easier to implement, provide higher performance and more flexibility than solutions which rely on hypervisors. However, as we'll discuss below; these perceptions are closely dependent on the hardware capabilities of the host processor.

Unsupervised AMP on Arm Cortex A9

The level of support and documentation for unsupervised AMP by ARM, Xilinx, and other silicon vendors varies as described below.

Arm (Cortex A9)

As shown by the excerpts below from the ARM Reference Manual for Cortex A9 some capabilities were incorporated within Cortex A9 IP in anticipation of unsupervised AMP configurations. Although the IP has been incorporated, the only Arm posting that we've been able to find on this subject can be found here: ARM Forum on Cortex A9 AMP








Xilinx (Cortex A9)

The Xilinx bare-metal application flow is fully supported by Xilinx-provided drivers and libraries as well as our development tools and a significant percentage of our customers deploy systems with bare-metal applications on Zynq-7000 based designs. In response to those customers who wanted AMP capabilities, we provided the 2013 application notes linked below:

From 2016 until present, Xilinx has extended our solutions to leverage the OpenAMP framework which leverages existing Linux software and services for both life-cycle management and communications between the two Zynq-7000 cores. These details may be found within the UG1186 Zynq OpenAMP Getting Started Guide


Other Silicon Vendors (Cortex A9)

In approximately 2014, a company named Embest offered an AMP solution for a subset of commercially available SoCs based on Cortex A9 that was very similar to the application notes provided by Xilinx. The engineer who did that AMP work recently communicated to us that he is available to do similar work from his current company Sihid Technology for Xilinx Zynq-7000 devices (see the page in Chinese or the English Translation from Google )




Unsupervised AMP on Cortex A53

Summary: Unsupervised AMP on Cortex A53 is neither recommended nor supported.

Arm (Cortex A53)

Although section 14.1.5 of the ARM Cortex-A Series Programmer’s Guide for ARMv8-A does indicate that unsupervised AMP is a valid system configuration, we are unaware of any other publicly accessible documentation, forums or information which addresses how such an AMP configuration might be designed or implemented. In addition, unlike the ARM Cortex A9 reference manual (excerpted above), the term "AMP" does not appear anywhere within the 6500 pages of the ARM v8-A Reference Manual . Finally, we are not aware of any public forums or posts regarding unsupervised AMP on ARM v8 SoCs.

Xilinx (Cortex A53)

While we know from our customer's experience that it is technically possible to run AMP on individual cores of the Cortex A53 cluster for their very tightly-constrained use-cases. However, such configurations face difficult and requirement/design-specific challenges. Because the variability is so high making a general-purpose, unsupervised AMP configuration impossible, Xilinx is unable to directly support customers who wish to deploy unsupervised AMP configurations across the Zynq UltraScale+ MPSoC APU. The following points elaborate on this topic:

We believe that ready access to hypervisors (See: 3rd Party Software Ecosystem) and the availability of the ARM v8-A hardware virtualization extensions address these same challenges much more simply and elegantly while bringing additional benefits related to platform maintenance as well as isolation and security.
See UG1228 UltraFast Embedded Design Methodology Guidefor additional details.



AMP Considerations (Cortex A53)

In recognition that some customers may still be interested to develop their own in-house, unsupervised AMP configurations, below we have highlighted some key considerations and questions that Xilinx has considered to come to our decisions above. These may assist developers to better understand the challenges and to define the shortest path to a viable system architecture.

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