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CONFIG_X86_CHECK_BIOS_CORRUPTION: Check for low memory corruption

General informations

The Linux kernel configuration item CONFIG_X86_CHECK_BIOS_CORRUPTION:

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Periodically check for memory corruption in low memory, which is suspected to be caused by BIOS. Even when enabled in the configuration, it is disabled at runtime. Enable it by setting "memory_corruption_check=1" on the kernel command line. By default it scans the low 64k of memory every 60 seconds; see the memory_corruption_check_size and memory_corruption_check_period parameters in Documentation/admin-guide/kernel-parameters.rst to adjust this.

When enabled with the default parameters, this option has almost no overhead, as it reserves a relatively small amount of memory and scans it infrequently. It both detects corruption and prevents it from affecting the running system.

It is, however, intended as a diagnostic tool; if repeatable BIOS-originated corruption always affects the same memory, you can use memmap= to prevent the kernel from using that memory.



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