The ACPI IPMI driver implements IPMI operation region support for the
ACPI core. Systems that declare ACPI operation regions may reference
them at any time, including during kernel initialisation. These accesses
will fail unless the ACPI IPMI driver is present, and undesirable system
behaviour may result. This can be avoided by building in the code rather
than leaving it as modules.
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Matthew Garrett | mjg59(a)srcf.ucam.org