Re: [Xen-ia64-devel] Serial woes with kexec on an HP RX2620

[Horms <horms@xxxxxxxxxxxx>]

On Fri, May 25, 2007 at 03:09:32PM +0900, Akio Takebe wrote:
> Hi, Horms
> 
> >I did find one thing which is interesting, which is that if
> >I boot into the first kernel with xencons_poll, and the second
> >kernel without it, then the console in both kernels works.
> >I wonder if perhaps the first kernel needs to unhook something
> >irq related.
> >
> >For completeness I tested all the combinations of booting with
> >and without xencons_poll
> >
> >First Kernel     Second Kernel
> >     -                -          No input on serial console
> >     -           xencons_poll    Success
> >xencons_poll          -          Success
> >xencons_poll     xencons_poll    Success
> I think RTE information don't be cleared.
> Or first kernel may have to write EOI to ioapic (please see 
> kexec_disable_iosapic() in linux code).
> 
> How about calling iosapic_unregister_intr() for serial console
> before booting second kernel?

Calling iosapic_unregister_intr() as you suggest seems to work :-)
I'll play around a bit more and get a patch together.

-- 
Horms
  H: http://www.vergenet.net/~horms/
  W: http://www.valinux.co.jp/en/


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