Subject: Re: Multiple busses of the same kind
To: Nathan J. Williams <nathanw@MIT.EDU>
From: Bill Studenmund <email@example.com>
Date: 07/30/2001 12:16:37
On 30 Jul 2001, Nathan J. Williams wrote:
> Bill Studenmund <firstname.lastname@example.org> writes:
> > Right, but you can really only have one subtractive-decoding bus in a
> > system. So one of these two isa busses has to be postitive-addressing
> > only.
> To be picky, that's a rule for a single PCI bus tree. There wouldn't
> be anything wrong with having multiple primary PCI buses, each with
> its own independent address space, and each one of those having a
> single subtractive bridge. Mutliple-primary-PCI systems certainly
True, but then wouldn't both of these isa busses appear in different parts
of the processor's address space?
Does our isa code deal with isa busses not being at 0-1 MB?