Die Blinkenlights
Need to control backplane lights
many standards: SES-2, SGPIO
support and features vary by driver and backplane
Agnoistic approach:
allow drivers to create new ctl files
regular ctl interface can't output
abstraction saved till later
Sdorion
creates a
led
cfl file
status driven externally
Example: check led status and fail drive
chula# cat led normal chula# echo fail>led; cat led fail
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