Baslinux mailing list

[sindi keesan <keesan AT sdf.lonestar.org>]

On Wed, 9 Nov 2005, David Moberg wrote:

> On 11/9/05, sindi keesan <keesan AT sdf.lonestar.org> wrote:
>
> > I learned that there are three formats of USB.
> > ohci (USB 1.0 and 1.1) - most brands of chip  - since 1996
> > uhci (ditto) - VIA and Intel chips only, more software based so cheaper to
> > manufacture, more cpu intensive.
> >
> > ehci (USB 2.0 - since 2000)
>
> ehci actually works with uhci, but only at the USB 1.1 speed. No big deal
> if you are only using a camera with a small memory card, or a keyboard.

Or a pre-2000 computer which does not have USB 2.0 anyway.

> > In DOS you can specify whether to expect ohci uhci or ehci, in order to
> > speed up the scan. Can you do this in linux while booting with the usb
> > scsi kernel using loadlin?
>
> I don't think so. How long does the scan take?

About 30 seconds but that also includes looking for attached devices.
Using switches /o or /u might save 5 seconds.

If I use a kernel with only module support, I could load either uhci or 
ohci modules, depending on the computer.  Or I could compile my own kernel 
eventually.

I speeded up the iomega guest program by remarking out all the 
inappropriate drivers.

> David
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keesan AT sdf.lonestar.org
SDF Public Access UNIX System - http://sdf.lonestar.org