tree f0e798cad86d64d6c2978307c94299f7f30eb208
parent fae880567f4e57a0f76a0a5c23084d29ff813f52
author York Sun <yorksun@freescale.com> 1449259027 -0800
committer York Sun <yorksun@freescale.com> 1450141052 +0800

Reserve secure memory

Secure memory is at the end of memory, separated and reserved
from OS, tracked by gd->secure_ram. Secure memory can host
MMU tables, security monitor, etc. This is different from PRAM
used to reserve private memory. PRAM offers memory at the top
of u-boot memory, not necessarily the real end of memory for
systems with very large DDR. Using the end of memory simplifies
MMU setup and avoid memory fragmentation.

"bdinfo" command shows gd->secure_ram value if this memory is
marked as secured.

Signed-off-by: York Sun <yorksun@freescale.com>