Re: [PATCH] Resurrect IT8172 IDE controller driver

From: Shane McDonald
Date: Wed Dec 03 2008 - 22:08:45 EST

On Mon, Nov 24, 2008 at 7:38 AM, Sergei Shtylyov
<sshtylyov@xxxxxxxxxxxxx> wrote:
> Hello.
> Alan Cox wrote:
>>>> It's 240, not 242 ns as 33 is actually 33.333.
>>> The maximum values give cycle time of 480 ns menaing that the controller
>>> doesn't support PIO mode 0. Hm...
>> Even if you clear the enable for the timing register ?
> These fast timing bits are documented as reserved.

The spec says that PIO mode 0 is supported, but Sergei is correct --
the maximum values give a cycle time of 480 ns. How can this be? The
old driver appeared to have tried to support PIO mode 0 by setting to
the maximum.

Which fast timing bits are documented as reserved? My spec has the
IDE Drive 0/1 Recovery Time and IDE Drive 0/1 Pulse Width bits in it.
Are there other timing bits that aren't documented in my spec?

Please excuse my dumb question -- I'm a little over my head here.

>> Alan
> MBR, Sergei

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