Patch merged into coreboot/master: 105f5b7 chromeos: Provide common watchdog reboot support

the following patch was just integrated into master:
commit 105f5b737bf8de88e37ed991d7469e84cef17c45
Author: Julius Werner 
Date:   Wed Jan 21 17:39:49 2015 -0800

chromeos: Provide common watchdog reboot support

Many ChromeOS devices use a GPIO to reset the system, in order to
    guarantee that the TPM cannot be reset without also resetting the CPU.
    Often chipset/SoC hardware watchdogs trigger some kind of built-in
    CPU reset, bypassing this GPIO and thus leaving the TPM locked. These
    ChromeOS devices need to detect that condition in their bootblock and
    trigger a second (proper) reboot.

This patch adds some code to generalize this previously
    mainboard-specific functionality and uses it on Veyron boards. It also
    provides some code to add the proper eventlog entry for a watchdog
    reset. Since the second reboot has to happen before firmware
    verification and the eventlog is usually only initialized afterwards, we
    provide the functionality to place a tombstone in a memlayout-defined
    location (which could be SRAM or some MMIO register that is preserved
    across reboots).

[pg: Integrates
     'mips: Temporarily work around build error caused by <arch/io.h> mismatch]

BRANCH=veyron
    BUG=chrome-os-partner:35705
    TEST=Run 'mem w 0xff800000 0x9' on a Jerry, watch how a "Hardware
    watchdog reset" event appears in the eventlog after the reboot.

Change-Id: I0a33820b236c9328b2f9b20905b69cb934326f2a
    Signed-off-by: Patrick Georgi 
    Original-Commit-Id: fffc484bb89f5129d62739dcb44d08d7f5b30b33
    Original-Change-Id: I7ee1d02676e9159794d29e033d71c09fdf4620fd
    Original-Signed-off-by: Julius Werner 
    Original-Reviewed-on: https://chromium-review.googlesource.com/242404
    Original-Reviewed-by: Aaron Durbin 
    Original-Commit-Id: c919c72ddc9d2e1e18858c0bf49c0ce79f2bc506
    Original-Change-Id: I509c842d3393bd810e89ebdf0dc745275c120c1d
    Original-Signed-off-by: Julius Werner 
    Original-Reviewed-on: https://chromium-review.googlesource.com/242504
    Original-Reviewed-by: David Hendricks 
    Reviewed-on: http://review.coreboot.org/9749
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer

See http://review.coreboot.org/9749 for details.

-gerrit