CONFIG_ARM_ERRATA_743622: ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption

General informations

The Linux kernel configuration item CONFIG_ARM_ERRATA_743622:

• prompt: ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption
• type: bool
• depends on: ( CONFIG_CPU_V7 ) && (! CONFIG_ARCH_MULTIPLATFORM )
• defined in arch/arm/Kconfig
• found in Linux kernels: 2.6.36–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.3, 5.4-rc+HEAD

Help text

This option enables the workaround for the 743622 Cortex-A9 (r2p*) erratum. Under very rare conditions, a faulty optimisation in the Cortex-A9 Store Buffer may lead to data corruption. This workaround sets a specific bit in the diagnostic register of the Cortex-A9 which disables the Store Buffer optimisation, preventing the defect from occurring. This has no visible impact on the overall performance or power consumption of the processor.

Hardware

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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