[PATCH 0/5] Add second memory region for crash kernel

[Eric W. Biederman]

Vivek Goyal <vgoyal at redhat.com> writes:

> On Thu, Apr 22, 2010 at 03:07:11PM -0700, Eric W. Biederman wrote:
>> Vitaly Mayatskikh <v.mayatskih at gmail.com> writes:
>> >
>> > This serie of patches realizes this approach. It requires also changes
>> > in kexec utility to make this feature work, but is
>> > backward-compatible: old versions of kexec will work with new
>> > kernel. I will post patch to kexec-tools upstream separately.
>> 
>> Have you tried loading a 64bit vmlinux directly into a higher address
>> range?  There may be a bit or two missing but you should be able to
>> load a linux kernel above 4GB.  I tested the basics of that mechanism
>> when I made the 64bit relocatable kernel.
>
> I guess even if it works, for distributions it will become additional
> liability to carry vmlinux (instead of relocatable bzImage). So we shall
> have to find a way to make bzImage work.

As Peter pointed out we actually have everything thing we need except
a bit of documentation and the flag that says this is a 64bit kernel.