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From: Don Lewis <Don.Lewis@tsc.tdk.com>
Message-Id: <199805060820.BAA20482@salsa.gv.tsc.tdk.com>
Date: Wed, 6 May 1998 01:20:04 -0700
In-Reply-To: Mike Smith <mike@smith.net.au>
       "Re: ISA-PnP w\o BIOS support?" (May  5, 11:26pm)
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To: Mike Smith <mike@smith.net.au>, Archie Cobbs <archie@whistle.com>
Subject: Re: ISA-PnP w\o BIOS support?
Cc: stefan@promo.de (Stefan Bethke), luigi@labinfo.iet.unipi.it,
        freebsd-hackers@FreeBSD.ORG
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On May 5, 11:26pm, Mike Smith wrote:
} Subject: Re: ISA-PnP w\o BIOS support?

} This actually falls a little short.  It's easier to look at it from a 
} different angle, too.
} 
}   For each PnP device/function in the system
}     If the device/function is not supported (unknown, no driver present)
}       deconfigure device (if required)
}       continue
}     else
}       while resources required
}         allocate new resources
}         test resources (using PnP test facility if available)
}       endwhile
}       if resources available
}         allocate a new driver instance, assign resources
}       else
}         continue
}     endif
}   endfor
} 
}   For each explicitly-configured ISA devices
}     if resource config does not conflict with PnP-configured device
}       allocate resources
}       if probe succeeds
}         allocate new driver instance
}       else
}         free resources
}       endif
}     endif
}   endfor

Why would you not want to reverse the order and configure the explicitly
configured ISA devices first and the PnP devices last?  If you configure
the PnP devices first, they might use resources required by the ISA
devices.  If you configure the ISA devices first, then you should be
able to adjust the resources used by the PnP devices so they don't
conflict with the ISA devices.

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