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Edward O'Callaghan fb17a7de89 vendorcode/amd/agesa/f16kb/*/PcieComplexDataKB.c: Implicit truncation
Clang complains:
 "implicit truncation from 'int' to bitfield changes value from -1 to 15"

-1 is define in 'c11std 6.3.1.3p2' as:

 [Signed and unsigned integers] Otherwise, if the new type is unsigned,
 the value is converted by repeatedly adding or subtracting one
 more than the maximum value that can be represented in the new type
 until the value is in the range of the new type.60)
 FOOTNOTE.60 The rules describe arithmetic on the mathem...

This is "0xFF" on Mullins and "0xF" in this case. Clang seems to
complain about this two's complement in a bitfield as being truncated.
As the bitfield is 4 bits wide, (a maximum of 15 decimal), we set the
field as '0x0F'. Ideally this field /should/ be set to 'UINT8_MAX' however
we still have silly truncation warnings.

Change-Id: Ib7476d453ffd932bb911e638117cf9f56f71f269
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/7719
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Tested-by: build bot (Jenkins)
2014-12-10 08:09:26 +01:00
3rdparty@9f68e20e5e 3rdparty: Update to latest commit in blobs repository 2014-12-01 08:50:32 +01:00
documentation mkelfimage: remove 2014-10-08 14:27:24 +02:00
payloads ARM: API to Map Physical Address to Wipe Memory above 4GB 2014-12-09 18:39:34 +01:00
src vendorcode/amd/agesa/f16kb/*/PcieComplexDataKB.c: Implicit truncation 2014-12-10 08:09:26 +01:00
util abuild: update output so multithreaded is decipherable 2014-12-10 00:17:31 +01:00
.gitignore .gitignore: add 3 executables that can be built in util/ 2014-08-11 06:26:01 +02:00
.gitmodules nvidia/cbootimage: avoid upstream's build system 2014-10-02 10:26:58 +02:00
.gitreview add .gitreview 2012-11-01 23:13:39 +01:00
COPYING
Makefile build system: use a single variable name for compiler runtimes 2014-11-25 08:47:38 +01:00
Makefile.inc build system: fix alignment function 2014-12-03 15:50:28 +01:00
README Update README with newer version of the text from the web page 2011-06-15 10:16:33 +02:00
toolchain.inc Add UCB RISCV support for architecture, soc, and emulation mainboard.. 2014-12-01 19:06:43 +01:00

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.