Date: Sun, 12 Aug 2001 11:29:08 -0700 From: Julian Elischer <julian@elischer.org> To: Joe Kelsey <joe@zircon.seattle.wa.us> Cc: Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp>, current@freebsd.org Subject: Re: FreeBSD's aggressive keyboard probe/attach Message-ID: <3B76CAF4.BCA989DF@elischer.org> References: <200108120813.RAA26578@zodiac.mech.utsunomiya-u.ac.jp> <15222.50892.75406.972475@zircon.zircon.seattle.wa.us>
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Joe Kelsey wrote:
>
> Thank you very much for the clear and cogent explanation of your
> philosophy of the psm code. Could I suggest that you copy the
> aforementioned e-mail directly into the psm.c file for everyone to see
> in posterity?
>
> Also, I have a fundamental problem with device flags. I believe that
> every situation which uses device flags should instead use sysctl
> variables, allowing easy manipulation at run-time.
sysctl variables are "one per system"
devices are "multiple per system"
unless you make the driver export a sysclt for each instance it sees
then there is a mismatch.
certainly there is a mismatch for probing for dvices.. which unfound device
do the sysctl variables corespond to?
> Of course, there are
> no doubt situations not addressable at run-time, but these should be the
> rare special cases where a driver flag is used.
>
> I also second Terry's comment about 0x800. There is no reason to add
> yet more driver flags in order to "do the right thing". The "do the
> right thing" case should always be default and a flag (sysctl variable,
> etc) should be used for those who want "the wrong thing".
>
> Thank you for your hard work and for taking the time to explain the
> design issues involved. Please place the design documentation in the
> code.
>
> /Joe
>
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