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Bug#336688: yaird also add [permanent] ide-generic

On Sun, Nov 20, 2005 at 11:40:00PM +0100, Sven Luther wrote:
> On Sun, Nov 20, 2005 at 10:19:19PM +0100, Erik van Konijnenburg wrote:
> > On Fri, Nov 18, 2005 at 03:36:52AM +0100, Mau wrote:

> > > ide-generic should probably not be permanent as it's not needed to boot
> > > the root filesystem. Please fix!

> > that's not handled by any other driver; if another driver is loaded after
> > ide-generic, the IDE devices are already claimed.

> Notice that i believe that ide-generic will drive any ide chipset for x86, i
> have some doubt of it working on non-x86 arches, at least it does not work on
> pegasos, and i don't think it will support the powermacs ide drives.
> The other problem is, as you say below, that loading it before the real thing
> will make the real thing not work, as is the case here.
> > However, as long as ide-generic is loaded after the chipset drivers,
> > all this ambiguity should not hurt too much.  For common hardware,
> > ide-generic is expected to be one of the last drivers loaded.
> Maybe the correct algorithm would be to :
>   1) only include ide-generic on x86 hardware.

Doable ...

>   2) load it after the real driver, and maybe only if the real driver didn't
>      produce a working driver for the root device.

This is the problematic one: piix is recognised and works, via8cxxx is recognised
and doesn't.  How would yaird distinguish when to load ide-generic?

> [ notes about how ide-generic is not especially easy to read ... ]

> So, what about your via based case ? Why does via alone not work ? This is
> probably a bug in the via driver, maybe because of the strange interrupt issue
> or something ?

I don't know.  Options at this point:

* Ideally, we could avoid the whole problem by just loading ide-generic
late, but according to the report that does not always work.  I'm curious
about the --verbose output; would that show why this approach doesnt work here?

* Or find out whether 'via needs ide-generic' is a bug or feature,
possibly repair the driver; does not sound simple.

* Or maintain a table of which drivers need ide-generic as extra.
Not the kind of maintenance we're looking forward to.


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