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.. SPDX-License-Identifier: GPL-2.0+
cbcmos
======
Synopis
-------
::
cbcmos check [<dev>]
cbcmos update [<dev>]
Description
-----------
This checks or updates the CMOS-RAM checksum value against the CMOS-RAM
contents. It is used with coreboot, which provides information about where to
find the checksum and what part of the CMOS RAM it covers.
If `<dev>` is provided then the named real-time clock (RTC) device is used.
Otherwise the default RTC is used.
Example
-------
This shows checking and updating a checksum across bytes 38 and 39 of the
CMOS RAM::
=> rtc read 38 2
00000038: 71 00 q.
=> cbc check
=> rtc write 38 66
=> rtc read 38 2
00000038: 66 00 f.
=> cbc check
Checksum 7100 error: calculated 6600
=> cbc update
Checksum 6600 written
=> cbc check
=>
See also :ref:`cedit_cb_load` which shows an example that includes the
configuration editor.
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