CONFIG_ARM_ERRATA_764319: ARM errata: Read to DBGPRSR and DBGOSLSR may generate Undefined instruction

General informations

The Linux kernel configuration item CONFIG_ARM_ERRATA_764319:

• prompt: ARM errata: Read to DBGPRSR and DBGOSLSR may generate Undefined instruction
• type: bool
• depends on: CONFIG_CPU_V7
• defined in arch/arm/Kconfig
• found in Linux kernels: 5.19, 6.0–6.12

Help text

This option enables the workaround for the 764319 Cortex-A9 erratum. CP14 read accesses to the DBGPRSR and DBGOSLSR registers generate an unexpected Undefined Instruction exception when the DBGSWENABLE external pin is set to 0, even when the CP14 accesses are performed from a privileged mode. This work around catches the exception in a way the kernel does not stop execution.

Hardware

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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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