CONFIG_ARM_ERRATA_852421: ARM errata: A17: DMB ST might fail to create order between stores

General informations

The Linux kernel configuration item CONFIG_ARM_ERRATA_852421:

• prompt: ARM errata: A17: DMB ST might fail to create order between stores
• type: bool
• depends on: CONFIG_CPU_V7
• defined in arch/arm/Kconfig
• found in Linux kernels: 4.8–4.20, 5.0–5.19, 6.0–6.12

Help text

This option enables the workaround for the 852421 Cortex-A17 (r1p0, r1p1, r1p2) erratum. Under very rare timing conditions, execution of a DMB ST instruction might fail to properly order stores from GroupA and stores from GroupB.

Hardware

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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