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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:

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



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