Re: [Xen-devel] xen-unstable on HP dc7800 simply reboots

[John Byrne <john.l.byrne@xxxxxx>]

John Byrne wrote:
> Keir Fraser wrote:
> > On 23/10/07 17:49, "John Byrne" <john.l.byrne@xxxxxx> wrote:
> >
> > > Does anyone know what is wrong or can tell me how to go about debugging
> > > this? The dmesg output from booting the Ubuntu 2.6.22-14-server kernel
> > > is attach in the hope that it will provide some useful information.
> > I suggest binary-chopping to find the offending changeset. Some early
> > boot-time stuff went in over the past few days, so for example try 
> > reverting
> > to 16130 and see if that has the same problem. Go back another 30, or
> > forward 15, changesets depending on whether that works or not. I suspect
> > this issue is quite new, so it shouldn't take too long to narrow down.
> Actually, it a few months old. xen-unstable 15236 is the last changeset 
> that Xen doesn't immediately reboot.
Littering the early boot code with putc() and comparing the code's 
behavior on a machine that actually boots, I've found that the call to 
get_memory_map from trampoline.S is the root of all evil. If that is 
called, then the trampoline fails to make it back to protected mode from 
real mode. I am still working to identify the specific problem.
John


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