tree 3c4a8582d2911b57c0ddd126551214440451b6bc
parent 2c2f04280162d9e012ee093fcd434b252533e6f1
author Ye Li <ye.li@nxp.com> 1559716418 -0700
committer Ye Li <ye.li@nxp.com> 1559788555 -0700

MLK-21885 lmb: Handle the overlap case for lmb reserve

lmb reserve is used to reserve some memory so that when loading images
(like kernel, dtb, initrd), images won't be loaded into the reserved memory.

The problem in current lmb is it does not handle the overlap case. When adding
a new reserved memory, if the memory region is overlap with regions already been
added in lmb, it will fail. One example is reserved memory in DTB may overlap with
u-boot relocate address. lmb reserves the u-boot relocate address firstly, so when
adding reserved memory from DTB, we will meet failure.

Actually if we handle the overlap case, we can resolve the overlap by using a max
common region for the overlap regions. So that this case won't fail.

Signed-off-by: Ye Li <ye.li@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
(cherry picked from commit 37d86c68816dffde3dc8dcda5b9d67a195b2f9c2)