CONFIG_ARM_ERRATA_742230: ARM errata: DMB operation may be faulty

General informations

The Linux kernel configuration item CONFIG_ARM_ERRATA_742230:

• prompt: ARM errata: DMB operation may be faulty
• type: bool
• depends on: ( CONFIG_CPU_V7 && CONFIG_SMP ) && (! 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, 6.0–6.8, 6.9-rc+HEAD

Help text

This option enables the workaround for the 742230 Cortex-A9 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction between two write operations may not ensure the correct visibility ordering of the two writes. This workaround sets a specific bit in the diagnostic register of the Cortex-A9 which causes the DMB instruction to behave as a DSB, ensuring the correct behaviour of the two writes. 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.

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The data is retrived from:

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• Linux Kernel Driver DataBase (LKDDb)

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