CONFIG_PJ4B_ERRATA_4742: PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation

General informations

The Linux kernel configuration item CONFIG_PJ4B_ERRATA_4742:

• prompt: PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation
• type: bool
• depends on: CONFIG_CPU_PJ4B && CONFIG_MACH_ARMADA_370
• defined in arch/arm/Kconfig
• found in Linux kernels: 3.10–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

When coming out of either a Wait for Interrupt (WFI) or a Wait for Event (WFE) IDLE states, a specific timing sensitivity exists between the retiring WFI/WFE instructions and the newly issued subsequent instructions. This sensitivity can result in a CPU hang scenario. Workaround: The software must insert either a Data Synchronization Barrier (DSB) or Data Memory Barrier (DMB) command immediately after the WFI/WFE instruction

Hardware

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Sources

This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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