Re: [reiserfs-dev] Re: IDE problem: linux-2.5.17

Martin Dalecki
2002-05-24T13:19:01Z

Użytkownik Vojtech Pavlik napisał:
> On Fri, May 24, 2002 at 01:03:26PM +0200, Martin Dalecki wrote:
>
>>Użytkownik Vojtech Pavlik napisał:
>>
>>
>>>>Hmm thinking again about it... It occurrs to me
>>>>that actually there should be a mechanism which tells the
>>>>host chip drivers whatever there are only just one or
>>>>two drivers connected. I will have to look in to it.
>>>
>>>
>>>There is no such mechanism (except for probing the drives). IDE has
>>>quite nonsensical "split" termination - the termination resistors are
>>>always present even on the middle device. This is to "simplify" things
>>>...
>>>
>>
>>Yes there is the host chip timer setting is basically
>>changing the termination properties on the hsot chips part
>>of the connection. This is the reason I was thinking
>>that making the driver for it know how many drivers
>>are attached to it could make some sense.
>
>
> Hmm, interesting. Is it on all chips or just some? I don't know about
> anything like that on Intel, VIA, nVidia, AMD, SiS and Artop controllers ...

Hey what I'm talking about is the "physics" of the hardware.
But I would rather expect sane hardware to deal with it transparently
to the programmer of the setup registers.