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Re: When default_value in CDL?


>>>>> "Andrew" == Andrew Lunn <andrew@lunn.ch> writes:

    Andrew> Hi Bart
    Andrew> I was looking at some CDL and noticed an option did not
    Andrew> have a default_value statement. The code seems to assume
    Andrew> if no default_value statement is given, the value will
    Andrew> automagically be zero. Is this true for CDL? I had a very
    Andrew> quick look at the documentation but could not find
    Andrew> anything which stated this.

It is true. From
http://ecos.sourceware.org/docs-latest/cdl-guide/ref.default-value.html

  "A cdl_option or other entity can have at most one default_value
  property, and it is illegal to have both a calculated and a
  default_value property in one body. If an option does not have
  either a default_value or a calculated property and it does not have
  the flavor none then the configuration tools will assume a default
  value expression of 0."

My personal preference is to always specify the default_value
explicitly. However at the time the language was specified other team
members wanted a sensible default default value, to reduce CDL script
verbosity. I cannot think of any reason for changing the current
behaviour, so those existing CDL scripts are safe.

Bart

-- 
Bart Veer                       eCos Configuration Architect
http://www.ecoscentric.com/     The eCos and RedBoot experts

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