Re: PCI USB Card question

On 27 Sep 2007 19:49:12 GMT, Dave Saville wrote:

"Something very important is that for each pair of USB ports on a
controller, a line specifying the appropriate device driver must be
added in your config.sys. For example: a six-port controller requires
you to have three lines in your config.sys (or even more if it's USB
2.0: two lines for each pair: one for the driver used for USB 1.1
devices; the other for USB 2.0). If you've got a controller with an
odd number of USB ports, then increment the number of cards by one,
and take that number to decide how many copies of the driver line
should be present in config.sys."

That's just confusing, it's assuming you have one 1.1 and one 2.0 for
each pair of ports. You just need an entry for each controller
regardless of how many ports there are. I think this is referring to
OHCI and UHCI but the issue is confused when EHCI came along, as you
found out below.

I've got a 4 port card here with two UHCI and one EHCI controllers on
board so maybe O/UCHI can only run two ports but it still needs the
EHCI driver to do that in the case of this card.

Maybe but using a USB stick with a single EHCI line none of the ports
worked. With no EHCI line and three OHCI lines a couple of the ports
worked. With three OHCI and one EHCI all six worked. Go figure.

It's all down to the internal switching of the ports to controllers.
You can't rely on one port being attached to a specific controller,
some OHCI ports may not be accessable without EHCI allowing it. I think
UHCI is USB 1.1, OHCI is USB 2.0 standard and EHCI is USB 2.0 fast but
I can't remember where I read that, I thought it was in
\os2\boot\usbbasic.txt but it isn't. I don't think you can even
guarantee which ports will work with just your three OHCI entries
another time but I may be wrong on that. Think of the card as a
telephone exchange with a mind of it's own. Even though you only have
one EHCI controller on the card all ports will work as USB 2.0 fast if
what's plugged in wants it.

Providing you have one driver for each controller it'll sort itself out
:-)

--
Regards - Rodney Pont - the twaddleman
The from address exists but is mostly dumped,
please send any emails to the address below
e-mail ngpsm4 (at) infohitsystems (dot) ltd (dot) uk


.

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