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CONFIG_ARM_ERRATA_742230: ARM errata: DMB operation may be faulty

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The Linux kernel configuration item CONFIG_ARM_ERRATA_742230:

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This option enables the workaround for the 742230 Cortex-A9 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction between two write operations may not ensure the correct visibility ordering of the two writes. This workaround sets a specific bit in the diagnostic register of the Cortex-A9 which causes the DMB instruction to behave as a DSB, ensuring the correct behaviour of the two writes.

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