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

[Akio Takebe <takebe_akio@xxxxxxxxxxxxxx>]

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?

Best Regards,

Akio Takebe


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