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SubjectRe: [PATCH] CONFIG_EISA note in Documentation/
> On Mon, Nov 13, 2000 at 05:07:22PM -0700, Steven Cole wrote:
> > +EISA support
> > + The Extended Industry Standard Architecture (EISA) bus was
> (i) I am a bit unhappy about adding configuration options
> like this. It regularly happens that I want to compile some kernel

You are unhappy, I am happy.
Now I can disable some drivers, which I am sure I don't need setting a single
option instead of few.
Also it anables better separation of architecture specyfic drivers:
do you know of Amiga with EISA ? Does my mips support it ?

# grep drivers/net/ arch/*/
arch/alpha/ source drivers/net/
arch/arm/ source drivers/net/
arch/i386/ source drivers/net/
arch/ia64/ source drivers/net/
arch/mips/ source drivers/net/
arch/mips64/ source drivers/net/
arch/ppc/ source drivers/net/
arch/sh/ source drivers/net/

> for some machine and have to grep the source and look at the config
> files how to enable something. A machine with RTL-8139? Let me see,
> that requires CONFIG_EXPERIMENTAL. (Not today, but until recently.)
> How do I get FireWire? Also requires CONFIG_EXPERIMENTAL. This
> CONFIG_EXPERIMENTAL is a very strange option. I know about my hardware,
> perhaps, but there is no reason to suppose that I know about the
> progress in development of Linux drivers for this hardware.
> Instead of having a global CONFIG_EXPERIMENTAL we should have
> a warning at each place that the driver is alpha.

Look at CML2 project. It supports a function showing all possible options,
if you choose... But it is project for Linux 2.5.

> If one does "make xconfig" then one sees a greyed out area,
> and the sometimes nontrivial puzzle is how to enable it.
> But with "make menuconfig" one never even sees the option,

But in "make config" you see much more than you want...

> (ii) In particular about this CONFIG_EISA and the given explanation.
> I have a computer, yes, several. But do I know whether it has
> an EISA bus? A week ago I hardly knew what EISA was, and would have
> been unable to answer. Today I know the answer for a handful of them
> but have not yet investigated the others.

OK. I tried to build an universal kernel, which supports every hardware &
software kernel drivers I ever needed on i386. It was much too big to
boot... (6 MB compressed)

> Now, if this knowledge was of major importance for the kernel
> then perhaps I had to learn about such details.
> However, CONFIG_EISA is almost completely superfluous, is not
> required at compile time, can easily be tested at run time,
> in other words adding such an option is a very stupid thing to do.

If you have too much memory, you can always choose CONFIG_EISA=y by default.

> [Steven, you understand that I would have written under CONFIG_EISA:
> say Y here - there is never any reason to say N, unless there exists
> hardware where the canonical probing hangs the machine.]
> The number of configuration options should be minimized.
> That is good for the user - fewer questions to answer.

Note, that "number of configuration options should be minimized"
and "fewer questions to answer" are not equivalent.

BTW, CONFIG_MCA needs some cleaning, also.

Andrzej M. Krzysztofowicz
tel. (0-58) 347 14 61
Wydz.Fizyki Technicznej i Matematyki Stosowanej Politechniki Gdanskiej
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