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, 5.0–5.19, 6.0–6.5, 6.6-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. Note that setting specific bits in the diagnostics register may not be available in non-secure mode and thus is not available on a multiplatform kernel. This should be applied by the bootloader instead.

Hardware

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The data is retrived from:

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• Linux Kernel Driver DataBase (LKDDb)

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