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

[Vitaly Mayatskikh]

At Thu, 22 Apr 2010 22:42:25 -0700, Eric W. Biederman wrote:

> > We have observed that on a machine which has 66G memory, when we do
> > crashkernel=1G at 4G, kexec failed to load the crash kernel, but the memory
> > reservation _did_ succeed.
> 
> Did you try loading vmlinux?   If not this sounds like the fact that
> /sbin/kexec doesn't realize it can boot a 64bit bzImage in 64bit
> mode.

/sbin/kexec currently has hardcoded limitations for bzImage and
initrd:

include/x86/x86-linux.h:

#define DEFAULT_INITRD_ADDR_MAX 0x37FFFFFF
#define DEFAULT_BZIMAGE_ADDR_MAX 0x37FFFFFF

This is easy to override. However, purgatory code still wants to see
kernel below 2 Gb (32-bit signed relocations).
-- 
wbr, Vitaly