Date: Wed, 27 Mar 2002 19:23:06 +0000 (GMT) From: Doug Rabson <dfr@nlsystems.com> To: Matthew Jacob <mjacob@feral.com> Cc: Doug Rabson <dfr@FreeBSD.org>, <cvs-committers@FreeBSD.org>, <cvs-all@FreeBSD.org> Subject: Re: cvs commit: src/sys/alpha/alpha dec_kn300.c src/sys/alpha/mcbus mcbus.c mcbusvar.h mcpcia.c mcpciavar.h Message-ID: <20020327191844.W17999-100000@salmon.nlsystems.com> In-Reply-To: <Pine.BSF.4.21.0203271005260.8052-100000@beppo>
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On Wed, 27 Mar 2002, Matthew Jacob wrote: > > > On Wed, 27 Mar 2002, Doug Rabson wrote: > > > On Tue, 26 Mar 2002, Matthew Jacob wrote: > > > > > > > > Huh. Does this actually work now? You have to know which hose the EISA bus is > > > on before you can attach sio and the console. > > > > Yes it does. I probe the first two hoses for the presence of the EISA bus. > > Actually, according to my reading of the manual, the ISA port and memory > > spaces are always on hose 0 (mid 4) at a fixed place in the address space, > > so this code is possibly more general than it needs to be. > > > > I wanted to leave open the possibility that it would be in a different place > on newer rawhide implementations (that never happened). The architecture was > quite broad- there was room for even a massively large GID space. Still, the manual clearly states in Table 2-10 that the EISA ports are at 0xf980000000 which implies that the corresponding sparse memory region is at 0xf800000000. Given that, I think we are safe. > > The other thing which always had me deferring attachment was that, like with > Sparc, you want to run with the F/W console until you really attach enough h/w > to use regular drivers for the console. The way NetBSD elected to do things, > and this pollution crept into FreeBSD, was to do 'early initialization'- I > always felt this was a crock. > > Still- if you have things working, then good! Plus working debugger support > for easly on stuff. The assumptions and design choices for the original stuff > were 4 years ago. Its also much easier to deal with now with the newer busspace implementation in -current compared to the state of affairs when you originally did the port. -- Doug Rabson Mail: dfr@nlsystems.com Phone: +44 20 8348 6160 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
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