CONFIG_ARM64_ERRATUM_1902691: Cortex-A510: 1902691: workaround TRBE trace corruption

General informations

The Linux kernel configuration item CONFIG_ARM64_ERRATUM_1902691:

• prompt: Cortex-A510: 1902691: workaround TRBE trace corruption
• type: bool
• depends on: CONFIG_CORESIGHT_TRBE
• defined in arch/arm64/Kconfig
• found in Linux kernels: 5.17–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

This option adds the workaround for ARM Cortex-A510 erratum 1902691.

Affected Cortex-A510 core might cause trace data corruption, when being written into the memory. Effectively TRBE is broken and hence cannot be used to capture trace data.

Work around this problem in the driver by just preventing TRBE initialization on affected cpus. The firmware must have disabled the access to TRBE for the kernel on such implementations. This will cover the kernel for any firmware that doesn't do this already.

If unsure, say Y.

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The data is retrived from:

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• Linux Kernel Driver DataBase (LKDDb)

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