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Date:	Wed, 1 Dec 2004 08:10:40 PST8
From:	Peter Skye <pskye@peterskye.com >
Reply-To:	scoug-help@scoug.com
To:	scoug-help@scoug.com
Subject:	SCOUG-Help: config.sys bus support ?

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Steven Levine wrote:
>
> >OS/2 has kernel support for the PCI bus. There is also a legacy ISA bus
> >which is connected to the PCI bus, and OS/2 also has kernel support for
> >the ISA bus. Yes?
>
> PCI and ISA are separate buses. You sould be able to find reasonable
> accurate connection diagrams with Google.

Don't need Google, I have the Intel tech manuals. They show the ISA bus
connected to the PCI bus, similar to SCSI and other connections.

> PCMCIA and legacy SCSI stuff connects the the ISA bus.
> Cardbus and newer SCSI HBAs connect to the PCI bus.

Good point, thanks.

> For USB host controllers, there are fewer
> choices (OHCI, UHCI and EHCI) because the
> intefaces to these devices are standardized.

So *that's* what OHCI, UHCI and EHCI are. Thanks.

> >Each device driver is specific to a particular bus and device.
>
> No. The driver is specific to whatever set of hardware the implementor
> chooses to support.

Your def is a bit more broad, but I can't think of a BASEDEV or DEVICE
that matches yours but not mine. I'd like to add one to my notes as an
example if you can think of one offhand.

> >The
> >device drivers are loaded after the bus drivers (otherwise the driver
> >can't communicate with the device because the bus isn't available yet).
> >Yes?
>
> Not really. Where this matters, the basedevs know to hold off until the
> init complete strategy call before attempting to take to other basedevs.

Good, thanks.

- Peter

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