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CONFIG_ARM64_ERRATUM_826319: Cortex-A53: 826319: System might deadlock if a write cannot complete until read data is accepted

General informations

The Linux kernel configuration item CONFIG_ARM64_ERRATUM_826319:

Help text

This option adds an alternative code sequence to work around ARM erratum 826319 on Cortex-A53 parts up to r0p2 with an AMBA 4 ACE or AXI master interface and an L2 cache.

If a Cortex-A53 uses an AMBA AXI4 ACE interface to other processors and is unable to accept a certain write via this interface, it will not progress on read data presented on the read data channel and the system can deadlock.

The workaround promotes data cache clean instructions to data cache clean-and-invalidate. Please note that this does not necessarily enable the workaround, as it depends on the alternative framework, which will only patch the kernel if an affected CPU is detected.

If unsure, say Y.

Hardware

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