PCI config space doubt

PCI config space doubt

[Rajat Jain]

Hi,

Does Linux assign the resources to PCI devices? Or is it done by PCI firmware?

If it is done by firmware, I have the following doubt:

By looking at the PCI configuration space, I can only see Base Address
Registers (BARS) for the 6 resources a device can have. How does the
kernel know about the length and the flags of the resources (since
they do no seem to be present in PCI config space)?

Thanks,

Rajat
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Re: PCI config space doubt

[Erik Mouw]

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On Tue, Apr 24, 2007 at 12:03:32PM +0530, Rajat Jain wrote:
> Does Linux assign the resources to PCI devices? Or is it done by PCI 
> firmware?

Yes.


Erik

- -- 
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eventually get them. -- Matthew Lammers in alt.sysadmin.recovery
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Re: PCI config space doubt

[Rajat Jain]

> On Tue, Apr 24, 2007 at 12:03:32PM +0530, Rajat Jain wrote:
> > Does Linux assign the resources to PCI devices? Or is it done by PCI
> > firmware?
>
> Yes.
>
>
> Erik
>

Hi Erik,

I'm sorry but I could not understand your "Yes" very well ... so Which
one of the following assigns the resources to PCI devices?

- Linux Kernel?
- PCI firmware?

Thanks,

Rajat
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Re: PCI config space doubt

[Erik Mouw]

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On Tue, Apr 24, 2007 at 03:20:01PM +0530, Rajat Jain wrote:
> >On Tue, Apr 24, 2007 at 12:03:32PM +0530, Rajat Jain wrote:
> >> Does Linux assign the resources to PCI devices? Or is it done by PCI
> >> firmware?
> >
> >Yes.
> 
> I'm sorry but I could not understand your "Yes" very well ... so Which
> one of the following assigns the resources to PCI devices?

Sorry, forgot to remove the remaining question.

> - Linux Kernel?

Kernel.

> - PCI firmware?

Modern BIOSes usually only initialise the devices needed for boot:
disk and video card. With older BIOSes you can control that by the
"PnP OS" option, even older BIOSes initialise every device.
 

Erik

- -- 
They're all fools. Don't worry. Darwin may be slow, but he'll
eventually get them. -- Matthew Lammers in alt.sysadmin.recovery
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Re: PCI config space doubt

[Rajat Jain]

On 4/24/07, Erik Mouw <mouw@nl.linux.org> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> On Tue, Apr 24, 2007 at 03:20:01PM +0530, Rajat Jain wrote:
> > >On Tue, Apr 24, 2007 at 12:03:32PM +0530, Rajat Jain wrote:
> > >> Does Linux assign the resources to PCI devices? Or is it done by PCI
> > >> firmware?
> > >
> > >Yes.
> >
> > I'm sorry but I could not understand your "Yes" very well ... so Which
> > one of the following assigns the resources to PCI devices?
>
> Sorry, forgot to remove the remaining question.
>
> > - Linux Kernel?
>
> Kernel.
>
> > - PCI firmware?
>
> Modern BIOSes usually only initialise the devices needed for boot:
> disk and video card. With older BIOSes you can control that by the
> "PnP OS" option, even older BIOSes initialise every device.
>

Thank You,

Rajat
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