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