tree 0d18a94af085d2aa400ac238d96dbee28d994d64
parent 7f062d74c63b008d12ed8bd987eebc90910e9892
author Allan Zhang <allanzhang@google.com> 1442869241 -0700
committer Allan Zhang <allanzhang@google.com> 1442880192 -0700

Lock down console

Two enhancements to lock down uboot to avoid user enter
interactive mode:
1. disable autodelay.
2. ignore ctlr-c completely during boot, so that user can
   not use hold ctrl-c from beginning to interrupt to
   interactive mode.
The second enhancement is simplified from
 http://lists.denx.de/pipermail/u-boot/2014-June/181071.html
for shutdown ctrl-c backdoor.

Change-Id: Iacb8dca644cfa86559d9e46e9fa58dcbf673f88e