[patch] Update of the VIA driver to version 3.20

[patch] Update of the VIA driver to version 3.20

[Vojtech Pavlik]

Hi!

The current VIA driver in 2.4.0 is version 2.1e. I wouldn't push a new
version, but VIA has released the vt82c686b chip and it's causing a lot
of trouble.

The 2.1e version can't recognize it from the vt82c686a, the only
difference being the revision of the ISA bridge. This causes quite a lot
of trouble, because the 686b chip has some significant changes in its
UDMA programming, because it can do UDMA100.

The 3.20 driver I'm sending a diff for is well tested and working
nicely, also enabling the use of UDMA100 on the vt82c686b.

On some vt82c586b's it fixes crashes and reboots, because it disables a
certain dangerous feature (hold PREQ# till DDACK# unasserted), which
BIOSes sometimes leave enabled.

It also handles 8-bit (command) timing of the ATA bus better.

I know it's a big change, but please put this patch either in 2.4.1 or
in 2.4.2 - it'll help a lot of people and I'll be getting much less
mails about non-working 686b's.

It's against 2.4.1-pre12, but should patch cleanly against pre11 or
anything later.

Thanks.

-- 
Vojtech Pavlik
SuSE Labs
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Re: [patch] Update of the VIA driver to version 3.20

[Vojtech Pavlik]

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On Tue, Jan 30, 2001 at 10:48:26AM +0100, Vojtech Pavlik wrote:

> The current VIA driver in 2.4.0 is version 2.1e. I wouldn't push a new
> version, but VIA has released the vt82c686b chip and it's causing a lot
> of trouble.
> 
> The 2.1e version can't recognize it from the vt82c686a, the only
> difference being the revision of the ISA bridge. This causes quite a lot
> of trouble, because the 686b chip has some significant changes in its
> UDMA programming, because it can do UDMA100.
> 
> The 3.20 driver I'm sending a diff for is well tested and working
> nicely, also enabling the use of UDMA100 on the vt82c686b.
> 
> On some vt82c586b's it fixes crashes and reboots, because it disables a
> certain dangerous feature (hold PREQ# till DDACK# unasserted), which
> BIOSes sometimes leave enabled.
> 
> It also handles 8-bit (command) timing of the ATA bus better.
> 
> I know it's a big change, but please put this patch either in 2.4.1 or
> in 2.4.2 - it'll help a lot of people and I'll be getting much less
> mails about non-working 686b's.
> 
> It's against 2.4.1-pre12, but should patch cleanly against pre11 or
> anything later.

And here goes the patch.

-- 
Vojtech Pavlik
SuSE Labs

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