Date: Sat, 10 Apr 1999 16:17:36 +0900 From: Tomoaki NISHIYAMA <tomoaki@biol.s.u-tokyo.ac.jp> To: mike@smith.net.au Cc: tomoaki@biol.s.u-tokyo.ac.jp Subject: Re: Any success with CirrusLogic 6729/6730??? Message-ID: <19990410161736W.tomoaki@moss.nibb.ac.jp> In-Reply-To: <199904092243.PAA00954@dingo.cdrom.com> References: <199904092243.PAA00954@dingo.cdrom.com> <199904090913.SAA03116@chandra.eatell.msr.prug.or.jp>
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From: Mike Smith <mike@smith.net.au>
Subject: Re: Any success with CirrusLogic 6729/6730???
Date: Fri, 09 Apr 1999 15:43:33 -0700
Message-ID: <199904092243.PAA00954@dingo.cdrom.com>
mike> By definition, an ISA PCIC is an ISA device. But a PCI PCIC is not an
mike> ISA device, even though it is logically identical.
Newconfig people did not say PCI PCIC should be treated as ISA device,
but they said that ISA PCIC and PCI PCIC in compatibility mode should be treated as
ISA device, and that PCI PCIC in native mode should be treated as PCI device.
mike> My point is that it is not useful to treat the PCIC as an ISA device.
mike> It should be treated as a bus bridge.
A bus bridge(PCIC) between ISA and PCMCIA is an ISA device.
A bus bridge connected to PCI is a PCI device.
They did not deny to treat PCIC as a bus bridge, but said that a bus
bridge is a device in itself.
mike> A SCSI pccard may give a bus hierarchy of nexus/PCI/PCCARD/SCSI if the
mike> PCIC is on the PCI bus, or nexus/ISA/PCCARD/SCSI if it is an ISA
mike> device. We need to treat these accordingly, and in the first case it
mike> is _not_ valid to consider the PCIC as "an ISA device".
If the pcic is in compatibility mode, then the PCIC should be
treated as ISA device, because it works as if it were nexus/ISA/PCCARD/SCSI.
If the pcic is in native mode then the PCIC is considered a PCI device.
This is why the pcic code is to be separated into three parts
as Nakagawa said.
y-nakaga> - Separate PCIC code into three parts: ISA frontend, PCI
y-nakaga> frontend and bus independent backend.
--------
Tomoaki Nishiyama
e-mail:tomoaki@biol.s.u-tokyo.ac.jp
Department of Biological Sciences,
Graduate School of Science, The University of Tokyo
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