CONFIG_FUJITSU_ERRATUM_010001: Fujitsu-A64FX erratum E#010001: Undefined fault may occur wrongly

General informations

The Linux kernel configuration item CONFIG_FUJITSU_ERRATUM_010001:

• prompt: Fujitsu-A64FX erratum E#010001: Undefined fault may occur wrongly
• type: bool
• depends on: (none)
• defined in arch/arm64/Kconfig
• found in Linux kernels: 5.1–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

This option adds a workaround for Fujitsu-A64FX erratum E#010001. On some variants of the Fujitsu-A64FX cores ver(1.0, 1.1), memory accesses may cause undefined fault (Data abort, DFSC=0b111111). This fault occurs under a specific hardware condition when a load/store instruction performs an address translation using: case-1 TTBR0_EL1 with TCR_EL1.NFD0 == 1. case-2 TTBR0_EL2 with TCR_EL2.NFD0 == 1. case-3 TTBR1_EL1 with TCR_EL1.NFD1 == 1. case-4 TTBR1_EL2 with TCR_EL2.NFD1 == 1.

The workaround is to ensure these bits are clear in TCR_ELx. The workaround only affects the Fujitsu-A64FX.

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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