CONFIG_ARM64_ERRATUM_1418040: Cortex-A76/Neoverse-N1: MRC read following MRRC read of specific Generic Timer in AArch32 might give incorrect result

General informations

The Linux kernel configuration item CONFIG_ARM64_ERRATUM_1418040:

• prompt: Cortex-A76/Neoverse-N1: MRC read following MRRC read of specific Generic Timer in AArch32 might give incorrect result
• type: bool
• depends on: CONFIG_COMPAT
• defined in arch/arm64/Kconfig
• found in Linux kernels: 5.2–5.19, 6.0–6.12

Help text

This option adds a workaround for ARM Cortex-A76/Neoverse-N1 errata 1188873 and 1418040.

Affected Cortex-A76/Neoverse-N1 cores (r0p0 to r3p1) could cause register corruption when accessing the timer registers from AArch32 userspace.

If unsure, say Y.

Hardware

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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