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Stefan Reinauer c63ad997a5 google/panther: acpi: Fix unstable fan behavior on boot + resume
FLVL is used to keep track of which thermal zones are active, but it is
not initialized upon boot / resume. An initial value of zero corresponds
to all zones being active, which causes the fan to spin at max speed
until the OS changes zones. Fix this annoyance by initializing FLVL to
the lowest temperature zone.

Also, fix a related bug where FLVL may jump to an undesired value. For
example, if FLVL=3 (zones 3 + 4 active), and zone 0 is set to off (it's
already off!), FLVL would previously become 1 (zones 1 + 2 + 3 + 4
active!). Fix this by not taking zone ON / OFF actions if our zone is
already ON / OFF.

BUG=chrome-os-partner:25766, chrome-os-partner:24775
TEST=Suspend / resume on Panther 20 times, verify that thermal zone after
resume matches expectation based upon temperature. Also, stress system
and verify thermal zones become active according to temperature
increase.

Change-Id: Ic60686aa5a67bf40c17497832b086ba09d56111a
Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org>
Signed-off-by: Stefan Reinauer <reinauer@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/186455
Reviewed-by: Stefan Reinauer <reinauer@chromium.org>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Commit-Queue: Shawn Nematbakhsh <shawnn@chromium.org>
Tested-by: Shawn Nematbakhsh <shawnn@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/186669
Commit-Queue: Stefan Reinauer <reinauer@chromium.org>
Tested-by: Stefan Reinauer <reinauer@chromium.org>
Reviewed-on: http://review.coreboot.org/6006
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
2014-07-12 20:17:01 +02:00
3rdparty@45f0c04fd7 acpigen: Add acpigen_emit_eisaid. 2014-06-01 01:24:53 +02:00
documentation Documentation: Use correct file name for the build guide in the Makefile 2014-07-04 19:03:10 +02:00
payloads mainboard: Add new board Google Panther 2014-07-12 20:16:42 +02:00
src google/panther: acpi: Fix unstable fan behavior on boot + resume 2014-07-12 20:17:01 +02:00
util utils/cbfstool: No need to pass -g flag twice 2014-06-29 04:16:49 +02:00
.gitignore git-ignore site-local 2014-04-01 08:55:02 +02:00
.gitmodules gitmodules: Fix 3rdparty updates 2013-06-28 00:56:43 +02:00
.gitreview add .gitreview 2012-11-01 23:13:39 +01:00
COPYING update license template. 2006-08-12 22:03:36 +00:00
Makefile Makefile: HOSTCC set too late in clang builds 2014-06-29 19:17:49 +02:00
Makefile.inc build system: avoid more race conditions 2014-07-10 20:56:35 +02:00
README Update README with newer version of the text from the web page 2011-06-15 10:16:33 +02:00
toolchain.inc build: remove -ccopts mechanism 2014-06-29 09:22:13 +02:00

README

-------------------------------------------------------------------------------
coreboot README
-------------------------------------------------------------------------------

coreboot is a Free Software project aimed at replacing the proprietary BIOS
(firmware) found in most computers.  coreboot performs a little bit of
hardware initialization and then executes additional boot logic, called a
payload.

With the separation of hardware initialization and later boot logic,
coreboot can scale from specialized applications that run directly
firmware, run operating systems in flash, load custom
bootloaders, or implement firmware standards, like PC BIOS services or
UEFI. This allows for systems to only include the features necessary
in the target application, reducing the amount of code and flash space
required.

coreboot was formerly known as LinuxBIOS.


Payloads
--------

After the basic initialization of the hardware has been performed, any
desired "payload" can be started by coreboot.

See http://www.coreboot.org/Payloads for a list of supported payloads.


Supported Hardware
------------------

coreboot supports a wide range of chipsets, devices, and mainboards.

For details please consult:

 * http://www.coreboot.org/Supported_Motherboards
 * http://www.coreboot.org/Supported_Chipsets_and_Devices


Build Requirements
------------------

 * gcc / g++
 * make

Optional:

 * doxygen (for generating/viewing documentation)
 * iasl (for targets with ACPI support)
 * gdb (for better debugging facilities on some targets)
 * ncurses (for 'make menuconfig')
 * flex and bison (for regenerating parsers)


Building coreboot
-----------------

Please consult http://www.coreboot.org/Build_HOWTO for details.


Testing coreboot Without Modifying Your Hardware
------------------------------------------------

If you want to test coreboot without any risks before you really decide
to use it on your hardware, you can use the QEMU system emulator to run
coreboot virtually in QEMU.

Please see http://www.coreboot.org/QEMU for details.


Website and Mailing List
------------------------

Further details on the project, a FAQ, many HOWTOs, news, development
guidelines and more can be found on the coreboot website:

  http://www.coreboot.org

You can contact us directly on the coreboot mailing list:

  http://www.coreboot.org/Mailinglist


Copyright and License
---------------------

The copyright on coreboot is owned by quite a large number of individual
developers and companies. Please check the individual source files for details.

coreboot is licensed under the terms of the GNU General Public License (GPL).
Some files are licensed under the "GPL (version 2, or any later version)",
and some files are licensed under the "GPL, version 2". For some parts, which
were derived from other projects, other (GPL-compatible) licenses may apply.
Please check the individual source files for details.

This makes the resulting coreboot images licensed under the GPL, version 2.