CONFIG_ARM_ERRATA_742230 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
ARM errata: DMB operation may be faulty
configname: CONFIG_ARM_ERRATA_742230
Linux Kernel Configuration
└─>System Type
└─>ARM errata: DMB operation may be faulty
In linux kernel since version 2.6.36 (release Date: 2010-10-20)
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. Note that setting specific bits in the diagnostics
register may not be available in non-secure mode and thus is not
available on a multiplatform kernel. This should be applied by the
bootloader instead.
(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. Note that setting specific bits in the diagnostics
register may not be available in non-secure mode and thus is not
available on a multiplatform kernel. This should be applied by the
bootloader instead.