Agilex™ 5 ES Device Errata and User Guidelines

ID 825514
Date 12/09/2024
Public
Document Table of Contents

3.2.4. 2743102: The core might deadlock during powerdown sequence

Description

While powering down the Processing Element (PE), a correctable L2 tag ECC error might cause a deadlock in the power-down sequence.

Conditions

This erratum occurs under the following conditions:

  1. Error detection and correction is enabled through ERXCTLR_EL1.ED=1.
  2. PE executes more than 24 writes to Device-nGnRnE or Device-nGnRE memory.
  3. PE executes power-down sequence as described in ARM TRM.

Impact

If the above conditions are met, the PE might deadlock during the hardware cache flush that automatically occurs as part of the power-down sequence.

Workaround

Add a DSB instruction before the ISB of the power-down code sequence specified in the ARM TRM.

Category

Category B