sbc: isa plug-n-play

Danny Pansters danny at
Fri Feb 22 23:04:27 UTC 2008

On Friday 22 February 2008 18:00:12 Torfinn Ingolfsen wrote:
> On Fri, 22 Feb 2008 18:17:27 +0200
> Andriy Gapon <avg at> wrote:
> > Everything works great. But recently I had an itch to go trough BIOS
> > settings. I spotted one named "Plug-n-Play OS" and it was set to
> The BIOS setting "Plug and Play OS" usually means that the OS will do
> its own little dance to set up any devices, so the bios just leaves
> them alone.
> > After that no joy, the soundcard stopped to work. It was detected as
> > before, there is no difference in dmesg whatsoever, but it did not
> Are you sure that it was detected _exactly_ as before? With the same
> irq(s), dma channels and so on?
> > So I disabled the option again and everything is fine.
> > Practical conclusion: don't do it.
> > Question of curiosity: what is it that BIOS can do with this card that
> > our driver can not ?

Stuff for windows.

> Well, the bios (and acpi on systems that have it) set up devices by
> assigning them irqs, io, memory and whatnot, if I undertstand this
> correctly.
> My understanding is that FreeBSD uses this information to attach drivers
> to the devices. If the devices are not set up correctly, FreeBSD either
> might not find them or it can't use them correctly.


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