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Joseph Lo 589e63ee7c drivers/gic: reprogram the GIC CPU interface to bypass IRQ
GICv2 provides a wake IRQ/FIQ (for wake-event purpose), which are not
disabled by GIC CPU interface. This is done by adding a bypass override
capability when the interrupts are disabled at the CPU interface. To
support this, there are four bits about IRQ/FIQ BypassDisable in CPU
interface Control Register. So the CPU can exit from WFI when an
asserted IRQ is coming. This is critical for power gating a CPU.

BRANCH=none
BUG=chrome-os-partner:39620
TEST=testing with CPU idle with power down state support and CPU can
     wake up normally

Change-Id: I71ac642e28024a562db898665b74a5791fce325a
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 3a3f098cbf3fbfdab8150ebd4fd688fdb472b529
Original-Change-Id: I20569a18f34a4b11b8c8c67ea255b3d0f021839f
Original-Signed-off-by: Joseph Lo <josephl@nvidia.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/269116
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/10172
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
2015-05-18 13:16:33 +02:00
3rdparty 3rdparty/blobs: Move submodule marker forward 2015-05-13 22:55:50 +02:00
Documentation Rename documentation -> Documentation 2015-05-06 19:09:47 +02:00
payloads libpayload: x86: correct types used for IO 2015-05-13 15:39:54 +02:00
src drivers/gic: reprogram the GIC CPU interface to bypass IRQ 2015-05-18 13:16:33 +02:00
util cbfstool: Fix shadowed global index 2015-05-17 16:05:08 +02:00
.gitignore fmaptool: Introduce the fmd ("flashmap descriptor") language and compiler 2015-05-08 19:55:42 +02:00
.gitmodules 3rdparty/vboot: Add vboot 2015-05-05 22:49:34 +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
MAINTAINERS MAINTAINERS: Add lint scripts 2015-05-07 19:41:22 +02:00
Makefile make: support absolute and relative obj= specifications 2015-05-08 19:47:11 +02:00
Makefile.inc fmaptool: Introduce the fmd ("flashmap descriptor") language and compiler 2015-05-08 19:55:42 +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 vboot: split class in library and stage 2015-04-30 15:39:53 +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.