Date: Fri, 20 Sep 1996 10:42:57 -0700 From: Janice McLaughlin <janus@freegate.net> To: "'hackers@freebsd.org'" <hackers@freebsd.org> Cc: "'janus@freegate.net'" <janus@freegate.net> Subject: Plug and Play naivety Message-ID: <01BBA6E0.7D655A60@ws40.freegate.net>
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I'm writing a device driver for an ISA card with the Plug and Play chip on it and have a few questions. (I'm not new to device drivers but am definately new to ISA and x86 class machines). I'm runing on 2.2-960801-SNAP. A search of the archives shows me that at least I'm not alone in my problems with PnP. I have also downloaded the latest code from Sujal Patel on freefall.freebsd.org for PnP support. 1. mail from Sujal notes that "if your motherboard supports PnP devices, then you don't need this code". What does this mean? I've been told that the BIOS on the machine I'm using has "Plug and Play" support ... does this mean it's possible that the BIOS has queried the ISA devices on boot and already has all the config info? Can I get at this somehow from the kernel? Or is this only referring to PCI kind of Plug and Play? 2. I notice that the recommendation for other cards (eg: 3c509) is to turn "off" PnP. That's sounds great ... how do I do that? Is it card specific? When you do this to a (for example) 3c509, does it stay off only until the next power up? or is there some NVRAM somewhere that can store this info so you don't have to reconfig it each time you reboot? Thanks alot, Janice
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