From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: Xen 4.0 does not boot up.
Date: Wed, 12 May 2010 14:20:36 -0400
Message-ID: <20100512182036.GA1599@phenom.dumpdata.com>
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On Wed, May 12, 2010 at 11:08:04AM -0700, ccmail111 wrote:
> Hi,
> 
> I downloaded Xen 4.0 and see that Xen does not boot up.
> After ACPI,
> 
> "Event-channel device installed."
> "registering netback"
> "hpet_acpi_add: no address or irqs in _CRS"
> "Non-volatile memory driver v1.3"
> "Linux agpgart interface v0.103"
> "[drm] Initialized drm 1.1.0 20060810"
> "Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled"
> 
> console message ( while initializing serial driviers) it is stuck forever. 
> 
> No other error message on console.
> 
> Any suggestions ?

http://wiki.xensource.com/xenwiki/XenParavirtOps

Specifically ready the part about debug/troubleshooting/ and also use 'initcall_debug
debug=10' boot parameter.