Date: Tue, 19 Aug 2008 11:56:17 -0500 From: Nathan Whitehorn <nwhitehorn@freebsd.org> To: Matt Sealey <matt@genesi-usa.com> Cc: ppc@freebsd.org, vi0@freebsd.org Subject: Re: Efika OF problems Message-ID: <48AAFB31.4010702@freebsd.org> In-Reply-To: <48AAEFC6.1050205@genesi-usa.com> References: <4810C7A2.40206@semihalf.com> <4811C774.9000407@genesi-usa.com> <4826CEA9.7020705@semihalf.com> <4827A9A0.3030102@genesi-usa.com> <48AAED83.1090403@semihalf.com> <48AAEFC6.1050205@genesi-usa.com>
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Matt Sealey wrote: > There are two problems with OF calls in FreeBSD; one is that FreeBSD > has no > support for a "real mode" Open Firmware - Apple's runs in "virtual mode" > which means it has all kinds of MMU stuff set up. > > Solaris had the same problem and Sun fixed it by implementing a slim > "VOF" > on top of our real OF, which implemented the virtual mode stuff. > > There is very, very little point in addressing this issue in firmware and > implementing virtual addressing inside firmware, as OF client calls are > stupidly slow. What you need to do is get it up and running and get > all the > OF stuff *well* out of the way *well* before any MMU stuff is set up by > the OS itself. > > NetBSD manages it somehow, I don't know how. You could have a chat with > Frank Wille.. (see the port-ofppc@netbsd.org list) We badly need a solution to this problem. I think the VOF route might not be a bad one for machines with hard-to-use firmwares -- we support runtime-switchable Open Firmware interfaces already, and we need support for Linux FDTs as well. -Nathanhome | help
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