CONFIG_ARM64_ERRATUM_2224489: Cortex-A710/X2: 2224489: workaround TRBE writing to address out-of-range

General informations

The Linux kernel configuration item CONFIG_ARM64_ERRATUM_2224489 has multiple definitions:

Cortex-A710/X2: 2224489: workaround TRBE writing to address out-of-range found in arch/arm64/Kconfig

The configuration item CONFIG_ARM64_ERRATUM_2224489:

• prompt: Cortex-A710/X2: 2224489: workaround TRBE writing to address out-of-range
• 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-A710/X2 erratum 2224489.

Affected Cortex-A710/X2 cores might write to an out-of-range address, not reserved for TRBE. Under some conditions, the TRBE might generate a write to the next virtually addressed page following the last page of the TRBE address space (i.e., the TRBLIMITR_EL1.LIMIT), instead of wrapping around to the base.

Work around this in the driver by always making sure that there is a page beyond the TRBLIMITR_EL1.LIMIT, within the space allowed for the TRBE.

If unsure, say Y.

Cortex-A710: 2224489: workaround TRBE writing to address out-of-range found in arch/arm64/Kconfig

The configuration item CONFIG_ARM64_ERRATUM_2224489:

• prompt: Cortex-A710: 2224489: workaround TRBE writing to address out-of-range
• type: bool
• depends on: CONFIG_CORESIGHT_TRBE
• defined in arch/arm64/Kconfig
• found in Linux kernels: 5.16, 5.17-rc+HEAD

Help text

This option adds the workaround for ARM Cortex-A710 erratum 2224489.

Affected Cortex-A710 cores might write to an out-of-range address, not reserved for TRBE. Under some conditions, the TRBE might generate a write to the next virtually addressed page following the last page of the TRBE address space (i.e., the TRBLIMITR_EL1.LIMIT), instead of wrapping around to the base.

Work around this in the driver by always making sure that there is a page beyond the TRBLIMITR_EL1.LIMIT, within the space allowed for the TRBE.

If unsure, say Y.

Hardware

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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