Date: Mon, 25 Aug 2003 17:02:30 -0400 (EDT) From: John Baldwin <jhb@FreeBSD.org> To: "M. Warner Losh" <imp@bsdimp.com> Cc: marcel@xcllnt.net Subject: Re: PERFORCE change 36551 for review Message-ID: <XFMail.20030825170230.jhb@FreeBSD.org> In-Reply-To: <20030822.154941.31253895.imp@bsdimp.com>
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On 22-Aug-2003 M. Warner Losh wrote: > In message: <20030822173606.GA849@dhcp42.pn.xcllnt.net> > Marcel Moolenaar <marcel@xcllnt.net> writes: >: > > So, please. Do not blur the distinction by having it all mapped as >: > > ISA devices. I really don't want to have to shoot you :-) >: > >: > Well, the other alternative is to add an ACPI attachment for every >: > ISA device. I'm sure you can appreciate my lack of zeal for this >: > option. :( >: >: Moving forward I would think that you replace ISA bus attachments >: with ACPI bus attachments until such time you don't have any ISA >: drivers anymore. That is, you probably need drivers for ISA devices >: that exist on alpha, so you'll end up with a handful of drivers >: that have both ACPI and ISA. Hmmm, I don't know if this holds for >: pc98 or not? > > Assumption: bus attachement are cheap. > > There will be a number of drivers that violate this, and may need to > be rearranged, but forcing a device onto the ISA bus because we don't > have a ACPI attachment for it is lame. > > The pc98 folks have expressed a strong desire that CBUS front ends be > separate from ISA front ends. There's a number of technical reasons > for this, in addition to the asthetic argument. Basically, they've > shoe-horned cbus into ISA bus, and it is a poor fit. Let's learn from > that lesson. ACPI isn't a bus like c-bus though. ACPI enumerates ISA devices. A closer analogy would be to create a pnpbios0 bus for ISA devices enumerated by the PNP BIOS. -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/
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