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Rizwan Qureshi a7ff453090 skylake: Update microcode reload in ramstage.
For Skylake, Microcode is being loaded from FIT, Skylake supports
the PRMRR/SGX feature. If This is supported the FIT microcode
load will set the msr (0x08b) with the Patch id one less than the
id in the microcode binary. This results in Microcode getting
reloaded again in bootclock and ramstage (MP init).
Avoid the microcode reload by checking for PRMRR support.

BUG=chrome-os-partner:42046
BRANCH=None TEST=Built for glados and tested on RVP3
CQ-DEPEND=CL:287513

Change-Id: Ic5dbf4d14dc1441e5b5acead589a418687df7dca
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: c599714b2aef476297eeaad5da8975731b12785a
Original-Change-Id: Id3a387aa2d8fd2fd69052bfc7b4e88a7ec277a72
Original-Signed-off-by: Rizwan Qureshi <rizwan.qureshi@intel.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/287674
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/11056
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: build bot (Jenkins)
2015-07-29 20:26:35 +02:00
3rdparty vboot: Don't count boot attempts if lid is closed 2015-07-08 19:40:24 +02:00
Documentation Remove empty lines at end of file 2015-06-08 00:55:07 +02:00
payloads libpayload: lz4: Add output overrun check to incompressible case 2015-07-21 21:27:42 +02:00
src skylake: Update microcode reload in ramstage. 2015-07-29 20:26:35 +02:00
util crossgcc: Support /bin/sh pointing to dash 2015-07-22 01:44:54 +02:00
.gitignore version: allow stating the coreboot revision in .coreboot-version 2015-07-13 21:00:59 +02:00
.gitmodules submodules: add arm-trusted-firmware third-party repository 2015-06-23 08:20:24 +02:00
.gitreview add .gitreview 2012-11-01 23:13:39 +01:00
COPYING
MAINTAINERS MAINTAINERS: grab build system responsibility 2015-05-22 22:47:03 +02:00
Makefile Makefile: Fix KCONFIG_AUTOHEADER dependencies 2015-07-18 09:41:31 +02:00
Makefile.inc cbfstool: fix alignment to 64 byte 2015-07-15 16:34:30 +02:00
README
toolchain.inc arm, arm64, mips: Add rough static stack size checks with -Wstack-usage 2015-07-29 20:25:59 +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.