CONFIG_ARM_ERRATA_643719: ARM errata: LoUIS bit field in CLIDR register is incorrect

General informations

The Linux kernel configuration item CONFIG_ARM_ERRATA_643719:

• prompt: ARM errata: LoUIS bit field in CLIDR register is incorrect
• type: bool
• depends on: CONFIG_CPU_V7 && CONFIG_SMP
• defined in arch/arm/Kconfig
• found in Linux kernels: 3.10–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

This option enables the workaround for the 643719 Cortex-A9 (prior to r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR register returns zero when it should return one. The workaround corrects this value, ensuring cache maintenance operations which use it behave as intended and avoiding data corruption.

Hardware

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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