CONFIG_ARM_ERRATA_458693: ARM errata: Processor deadlock when a false hazard is created

General informations

The Linux kernel configuration item CONFIG_ARM_ERRATA_458693:

• prompt: ARM errata: Processor deadlock when a false hazard is created
• type: bool
• depends on: ( CONFIG_CPU_V7 ) && (! CONFIG_ARCH_MULTIPLATFORM )
• defined in arch/arm/Kconfig
• found in Linux kernels: 2.6.30–2.6.39, 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 458693 Cortex-A8 (r2p0) erratum. For very specific sequences of memory operations, it is possible for a hazard condition intended for a cache line to instead be incorrectly associated with a different cache line. This false hazard might then cause a processor deadlock. The workaround enables the L1 caching of the NEON accesses and disables the PLD instruction in the ACTLR register. Note that setting specific bits in the ACTLR 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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