Date: Mon, 23 Oct 1995 20:44:25 +0930 (CST) From: Michael Smith <msmith@atrad.adelaide.edu.au> To: bde@zeta.org.au (Bruce Evans) Cc: hackers@freebsd.org, msmith@atrad.adelaide.edu.au Subject: Re: New userconfig Message-ID: <199510231114.UAA02636@genesis.atrad.adelaide.edu.au> In-Reply-To: <199510231037.UAA24992@godzilla.zeta.org.au> from "Bruce Evans" at Oct 23, 95 08:37:17 pm
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Bruce Evans stands accused of saying: > Note that userconfig can't use special values to decide which values can be > changed, since it needs to be able to change to and from all values. > Currently unadvertised driver capablities determine which values actually > make sense. Given that the driver parameters are unadvertised, special values have to be used, unless you care to suggest an alternative form of telepathy. > The -1 and -2 above are back to front. -1 has always meant `?' > (autoconfig). There is a special rule for this in config/lang.l. No problem; I'll use -1 for auto, and -2 for none. The distinction needs to be made either way. > Drivers should never use compiled in defaults for this, but they may use > values read from firmware. Some drivers, as has already been established, need to use compiled-in defaults in order to function usefully in this imperfect world 8( > `none' is a verbose alternative to `'. I think nonspecified parameters > always have a value of -1 except in cases where 0 is more natural (for > pointers and bitmaps). Is anything specific going to break if nonspecified parameters become -2, rather than -1? > I think you'll eventually have to modify device tables in 1001 drivers. Indeed; however before I commit bloody murder on the statically defined device attributes, I'd like some input from those with a little more experience 8) (I'd also like some reassurance that I can 'make world' -current from -stable and have a reasonable chance of getting somewhere, so that I can get in step with the current state of the art) > Bruce -- ]] Mike Smith, Software Engineer msmith@atrad.adelaide.edu.au [[ ]] Genesis Software genesis@atrad.adelaide.edu.au [[ ]] High-speed data acquisition and [[ ]] realtime instrument control (ph/fax) +61-8-267-3039 [[ ]] My car has "demand start" -Terry Lambert UNIX: live FreeBSD or die! [[
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