CONFIG_ARM_ERRATA_460075: ARM errata: Data written to the L2 cache can be overwritten with stale data

General informations

The Linux kernel configuration item CONFIG_ARM_ERRATA_460075:

• prompt: ARM errata: Data written to the L2 cache can be overwritten with stale data
• 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 460075 Cortex-A8 (r2p0) erratum. Any asynchronous access to the L2 cache may encounter a situation in which recent store transactions to the L2 cache are lost and overwritten with stale memory contents from external memory. The workaround disables the write-allocate mode for the L2 cache via 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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• Linux Kernel Driver DataBase (LKDDb)

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