kexec-tools and multiboot breakage

Peter Chubb peter.chubb at
Tue Jan 14 22:25:49 EST 2014

Hi Simon,
   When you get a moment, please check out

Quick summary:
  If your kernel is configured to protect the first few pages of
  physical memory, then low memory doesn't start at location 0 --- so
  when scanning the memory ranges from /proc/iomem, the code in
  kexec/arch/i386/kexec-multiboot-x86.c never fills in mem_lower.

  I think it's safe to assume that if a memory segment starts at 64k or
  lower, it can be extended to location 0 because of the kernel
  protection on a PC99-style architecture.

Peter C
Dr Peter Chubb				        peter.chubb AT          Software Systems Research Group/NICTA

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