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What: /dev/raw-kcs*
Date: 2021-02-15
KernelVersion: 5.13
Contact: openbmc@lists.ozlabs.org
Contact: openipmi-developer@lists.sourceforge.net
Contact: Andrew Jeffery <andrew@aj.id.au>
Description: ``/dev/raw-kcs*`` exposes to userspace the data and
status registers of Keyboard-Controller-Style (KCS) IPMI
interfaces via read() and write() syscalls. Direct
exposure of the data and status registers enables
inefficient but arbitrary protocols to be implemented
over the device. A typical approach is to use KCS
devices for out-of-band signalling for bulk data
transfers over other interfaces between a Baseboard
Management Controller and its host.
+--------+--------+---------+
| Offset | read() | write() |
+--------+--------+---------+
| 0 | IDR | ODR |
+--------+--------+---------+
| 1 | STR | STR |
+--------+--------+---------+
Users: libmctp: https://github.com/openbmc/libmctp
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