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

[Simon Horman <horms@xxxxxxxxxxxx>]

On Tue, May 22, 2007 at 10:28:13PM -0600, Alex Williamson wrote:
> On Wed, 2007-05-23 at 12:49 +0900, Simon Horman wrote:
> > Hi,
> > 
> > I've been trying to hunt down a problem with the serial console on the
> > HP RX2620, whereby after kexec the console doesn't accept input,
> > although it does produce output quite happily. I should also note that
> > this problem does not manifest on the Tiger2 machine I have.
> 
> Hi Simon,
> 
>    Are you using the serial console on the management processor or the
> one off the motherboard?  (if the MP, ctrl-b does something, otherwise
> esc-( and esc-) do something)  All the HP boxes setup their console in
> Xen through efi_setup_pcdp_console().  You likely wouldn't be getting
> console output if you weren't getting there at all, but perhaps
> something is going wrong setting up the IRQ.  The MP console is a PCI
> UART and will use the generic interrupt polarity triggers, while the
> motherboard UART is special cased in pcdp_hp_irq_fixup().  The HP system
> will require a working IOSAPIC for the interrupt whereas the Tiger might
> make due with some kind of legacy interrupt routing.  Since the IOSAPICs
> aren't enumerated till later, the interrupt isn't setup till fairly late
> in start_kernel().  If you're trying to get input before that, it won't
> work.  Hopefully you can trace through those paths and find something
> missing.  Thanks,

Hi Alex,

thanks for the ideas, I'll see what I can find :-)

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


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