Re: [Xen-devel] Re: 3.0.4 and 3.1-rc4 based dom0 won't boot with acpi=off

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Sun, Sep 18, 2011 at 09:27:03PM +0200, Sven Köhler wrote:
> Am 12.09.2011 17:06, schrieb Konrad Rzeszutek Wilk:
> > On Sun, Sep 11, 2011 at 02:44:35AM +0200, Sven Köhler wrote:
> >> Am 11.09.2011 02:28, schrieb Konrad Rzeszutek Wilk:
> >>> You might want to try some parameters on the Xen line to alter how
> >>> it is suppose to reboot.
> >>>
> >>> /*
> >>>  * reboot=b[ios] | t[riple] | k[bd] | n[o] [, [w]arm | [c]old]
> >>
> >> Thanks for the list.
> >> I guess, both reboot=bios and reboot=b is accepted?
> >> BTW: "no" is missing in the list below. acpi is missing in the list
> >> above. And actually what's the source for list?
> > 
> > Xen hypervisor source. I just did a quick search for 'reboot='
> 
> I checked the sources of Linux 3.1rc4 and he xen hypervisor (4.1.1).
> The code for reboot is almost the same. One tiny difference is that the
> code of xen sets the reset flag of the kbd controller 100 times, while
> Linux does that only 10 times:
> 
> Xen:
> >             for ( i = 0; i < 100; i++ )
> >             {
> >                 kb_wait();
> >                 udelay(50);
> >                 outb(0xfe,0x64); /* pulse reset low */
> >                 udelay(50);
> >             }
> 
> Linux:
> >                         for (i = 0; i < 10; i++) {
> >                                 kb_wait();
> >                                 udelay(50);
> >                                 outb(0xfe, 0x64); /* pulse reset low */
> >                                 udelay(50);
> >                         }
> 
> 
> Summing up, both Linux 3.1 and Xen 4.1 both do the following sequence by
> default:
> 
> ACPI, KBD, ACPI, KBD, TRIPLE, KBD, TRIPLE, KBD, ...
> 
> While each KBD stands for 10 (Linux) or 100 (Xen) times setting the kbd
> controller reset flag. I wonder why Xen does the kbd controller reset a
> hundred times. Maybe it's a left over from xen 3.x?

Could be.
> 
> Would you mind changing it from 100 to 10?

Does it fix the problem with this particular board? If so, then that sounds
like we should do.
> 
> 
> Now taking a look at Xen 3.4.2, the default reboot sequence is a bit
> different. It's
> 
> ACPI, KBD, ACPI, KBD, ACPI, KBD, ACPI, KBD, ....
> 
> No triple fault reset attempts.

Ah, could be that we just never had it implemented then.
> 
> 
> 
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