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Julius Werner 586460b242 cbfs: Check return value of map() for error
The CBFS core checks the result of a media->map() operation in multiple
places for CBFS_MEDIA_INVALID_MAP_ADDRESS, suggesting that this is a
valid response. However, it ironically fails to do so when actually
mapping the CBFS file itself, which can fail on buffer-constrained
systems since the size is much larger than when mapping metadata. This
patch adds a check with an error message and a NULL pointer return for
that case to make it easier to understand this condition.

Change-Id: Icae3dd20d3d111cdfc4f2dc6397b52174349b140
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/174951
Reviewed-by: Gabe Black <gabeblack@chromium.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
(cherry picked from commit 63f2c4465f9633a637186e69bc3862d5413106ac)
Signed-off-by: Isaac Christensen <isaac.christensen@se-eng.com>
Reviewed-on: http://review.coreboot.org/6537
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
2014-08-10 22:28:10 +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 cbfs: Fix overwalk on file scan 2014-08-10 22:25:07 +02:00
src cbfs: Check return value of map() for error 2014-08-10 22:28:10 +02:00
util ifdtool: Provide bounds on string parser 2014-08-10 18:50:30 +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 build system: avoid warning about missing .xcompile 2014-07-20 19:51:10 +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 system: remove duplicate architecture list 2014-07-30 21:06:43 +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.