Agilex™ 7 M-Series Known Issue List

ID 851750
Date 12/17/2025
Public
Document Table of Contents

2.6.2. Cache coherency problems when using snoop filtering in the system

Description

Due to a problem with integrating the Arteris Ncore Cache Coherency Unit (CCU) IP, cache coherency errors may be seen for cache coherent transactions initiated in the system.

Workaround

To work around this problem, snoop filters for the CCUare disabled which now implements broadcast snoops for all coherent transactions. This is accomplished via a patch for u-boot-socfpga and is available on https://github.com/altera-opensource/u-boot-socfpga starting with the following branches:

https://github.com/altera-opensource/u-boot-socfpga

V2020.10
  • HSD #14012926793: cache: ncore: Disable snoop filter
  • Commit date: March 31, 2021
  • commit ID c79c23c6201819ca32b6739eff2e2b25e19f6624

This patch is included in later branches.

Status

Table 49.  Device Status Table
Devices Affected Planned Fix
  • AGM[B,E,F]0xxR47Axxxx
  • AGMB0xxR31Bxxxx
  • AGMF0xxR47Bxxxx
No planned fix