CONFIG_ARM64_ERRATUM_2457168: Cortex-A510: 2457168: workaround for AMEVCNTR01 incrementing incorrectly

General informations

The Linux kernel configuration item CONFIG_ARM64_ERRATUM_2457168:

• prompt: Cortex-A510: 2457168: workaround for AMEVCNTR01 incrementing incorrectly
• type: bool
• depends on: CONFIG_ARM64_AMU_EXTN
• defined in arch/arm64/Kconfig
• found in Linux kernels: 6.0–6.11

Help text

This option adds the workaround for ARM Cortex-A510 erratum 2457168.

The AMU counter AMEVCNTR01 (constant counter) should increment at the same rate as the system counter. On affected Cortex-A510 cores AMEVCNTR01 increments incorrectly giving a significantly higher output value.

Work around this problem by returning 0 when reading the affected counter in key locations that results in disabling all users of this counter. This effect is the same to firmware disabling affected counters.

If unsure, say Y.

Hardware

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The data is retrived from:

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• Linux Kernel Driver DataBase (LKDDb)

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