Re: FreeBSD 7.0 SATA Controller

so does that mean i need to disable the apic? and are we
talking about apic
now or acpi? im getting all these devices confused now. i
realize that acpi
is dissabled when you press number 2 at the boot menu but
are we talking
about that or apic?

On Sat, May 3, 2008 at 1:34 PM, Jeremy Chadwick
<koitsufreebsd.org> wrote:

> On Fri, May 02, 2008 at 11:03:16PM +0100, Dieter
wrote:
> > > > > > the next step im going
> > > > > > to take is installing 6.2 and
remaking the world but adding
> device
> > > > > > aptic to the kernel.
> > > > >
> > > > > I think you mean "device
apic" to the kernel?
> > > >
> > > > No, it is "device aptic".  It
was in 6 but removed from 7.  I had to
> add
> > > > aptic to get my nforce4-ultra board to
boot 7.  Given that 6 runs on
> > > > Shaun's machine and 7 doesn't, adding
aptic is a useful thing to
> try.
> > >
> > > There is no "aptic" device on
RELENG_6.  I just did a grep -ri "aptic"
> > > /usr/src on our RELENG_6 box and found
absolutely no trace of said
> > > device.  You are thinking of
"apic".
> >
> > Typo.  Should be "device atpic".
>
> Ah yes.  That would be the classic AT-style PIC used
for interrupt
> handling.  That makes much more sense.  
>
> --
> | Jeremy Chadwick                                jdc at
parodius.com |
> | Parodius Networking                       http://www.parodius.com/
|
> | UNIX Systems Administrator                  Mountain
View, CA, USA |
> | Making life hard for others since 1977.             
PGP: 4BD6C0CB |
>
>
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On Sat, May 03, 2008 at 09:15:24PM -0400, Shaun Sabo wrote:
> so does that mean i need to disable the apic? and are
we talking about apic
> now or acpi? im getting all these devices confused now.
i realize that acpi
> is dissabled when you press number 2 at the boot menu
but are we talking
> about that or apic?

ACPI:	Commonly used for system configuration data
(stored/controlled by
	BIOS), power management, and a couple other things. 
Unrelated
	to APIC and ATPIC.
APIC:	Advanced interrupt routing IC; more or less used to
extend
	interrupt limitations of old PIC-based interrupts. 
Originally
	there were 16 IRQs, most taken up by system necessities. 
An APIC
	extends that to 256 IRQs, providing each device with its
own IRQ,
	assuming the OS supports APICs, otherwise it'll resort to
	classic 16 IRQ behaviour (sharing of IRQs, etc.)
	http://en.wikipedia.org/wiki/Advanced_Pro
grammable_Interrupt_Controller
ATPIC:	Classic 8259 PIC ("AT PIC"), 16 IRQ
limitation, etc.
	http://en.wikipedia
.org/wiki/8259

Hope this clears things up for you.

I've never seen a system made in the past 7-8 years which
demands the
use of atpic.  Most present-day systems, even uni-processor
systems,
have an APIC, and most of the time those work without
issue.

If you want to disable the APIC, you can do so by booting
FreeBSD
in "safe mode".  It should be a menu item; I
forget which number.

"Safe mode" will disable the following things:

* Disable use of ACPI
* Disable APIC
* Disable DMA capability on ATA devices (does not apply to
SATA)
* Disable DMA capability on ATAPI device (CD/DVD-ROMs,
etc.)
* Disabled hard disk write caching
* Disables kbdmux(4)
* Does something with hw.eisa_slots, which I don't quite
understand.
  Only "easy" reference I can find is to old
Adaptec controllers
  requiring hw.eisa_slots="12".

-- 
| Jeremy Chadwick                                jdc at
parodius.com |
| Parodius Networking                       http://www.parodius.com/
|
| UNIX Systems Administrator                  Mountain View,
CA, USA |
| Making life hard for others since 1977.              PGP:
4BD6C0CB |

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