Fix value of mbi->mem_lower for multiboot-x86

In the multiboot header, there is a field, `mem_lower' that is meant to
contain the size of memory starting at zero and ending below 640k.
If your kernel is compiled with CONFIG_X86_RESERVE_LOW non zero
(the usual case), then a hole is inserted into kernel's physical
memory map at zero, so the test to find the size of this region in
kexec/arch/i386/kexec-multiboot-x86.c never succeeds, so the value is
always zero.

On a PC99 architecture, there is always memory at physycal address zero;
assume that a region that starts below 64k actually starts at zero,
and use it for the mem_lower variable.

Signed-off-by: Peter Chubb <peter.chubb@nicta.com.au>
Signed-off-by: Simon Horman <horms@verge.net.au>

0 files changed, 0 insertions, 0 deletions