tree b2a9d9fc14031f6ea6d844580557de4e6eed8a07
parent 5c4a5b8de65d08a436d112307204542a4d559ee2
author Kumar Gala <galak@kernel.crashing.org> 1316187598 -0500
committer Kumar Gala <galak@kernel.crashing.org> 1318393840 -0500

powerpc: respect mem= setting for early memory limit setup

For those MMUs that have some form of bolt'd linear mapping (TLB)
required its rare that one ever sets mem= smaller than the size of that
mapping.

However, on Book-E 64 parts the initial linear mapping is quite large
(1G) so its quite reasonable that mem= is set smaller than that.

We need to parse the command line for mem= limit and constrain the
amount of memory we map initially by it if need be.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>