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ZhengShunQian f4401eb997 google/veyron*: change .ddrconfig from 14 to 3
There are two configs, sdram-lpddr3-hynix-2GB.inc and
sdram-lpddr3-samsung-2GB-24EB.inc that use .ddrconfig = 14.

Changing .ddrconfig from 14 to 3 improves performance
especially on contiguous memory accesses. Comparing the .ddrconfig:
 - if .ddrconfig = 3,
   C RDRR RRRR RRRR RRRR RBBB CCCC CCCC C---
 - if .ddrconfig = 14,
   C DRBB BRRR RRRR RRRR RRRR CCCC CCCC C---
where
 - R: indicates Row bits
 - B: indicates Bank bits
 - C: indicates Column bits
 - D: indicates Chip selects bits

.ddrconfig = 3 has multiple banks switching which improves DDR timing.

BUG=chrome-os-partner:57321
TEST=Boot from fievel and play video
BRANCH=veyron

Change-Id: Ifdcedc28e84429b8b79c7553b38b667631d29c09
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 93882e4f2000d93c9dae5e6d4b2e1f4b7bc9489e
Original-Change-Id: Ic98ebae48609a7604ec678b6bd14dd2b29b669c4
Original-Signed-off-by: ZhengShunQian <zhengsq@rock-chips.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/404691
Original-Commit-Ready: Shunqian Zheng <zhengsq@rock-chips.com>
Original-Tested-by: Shunqian Zheng <zhengsq@rock-chips.com>
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/17210
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Martin Roth <martinroth@google.com>
2016-11-03 13:53:56 +01:00
3rdparty Set up 3rdparty/libgfxinit 2016-10-29 01:35:03 +02:00
Documentation Documentation: Add documentation for GPIO toggling in ACPI AML 2016-10-29 00:13:06 +02:00
payloads Do not select SEABIOS_VGA_COREBOOT by default when building for QEMU 2016-10-27 18:52:30 +02:00
src google/veyron*: change .ddrconfig from 14 to 3 2016-11-03 13:53:56 +01:00
util util/amdfwtool: Increase space used for structures 2016-11-02 18:39:53 +01:00
.checkpatch.conf Update .checkpatch.conf 2016-09-02 18:22:04 +02:00
.clang-format
.gitignore .gitignore: Add coreinfo build residue, defconfig 2016-09-02 18:20:51 +02:00
.gitmodules Set up 3rdparty/libgfxinit 2016-10-29 01:35:03 +02:00
.gitreview
COPYING
MAINTAINERS MAINTAINERS: Add Jonathan Neuschäfer as RISC-V co-maintainer 2016-10-15 00:35:04 +02:00
Makefile Makefile: Allow inclusion of source files from 3rdparty/ 2016-10-29 01:34:06 +02:00
Makefile.inc Set up 3rdparty/libgfxinit 2016-10-29 01:35:03 +02:00
README Remove extra newlines from the end of all coreboot files. 2016-07-31 18:19:33 +02:00
gnat.adc gnat.adc: Do not generate assertion code for Refined_Post 2016-10-29 01:33:31 +02:00
toolchain.inc Add minimal GNAT run time system (RTS) 2016-09-19 11:14:49 +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
------------------

 * make
 * gcc / g++
   Because Linux distribution compilers tend to use lots of patches. coreboot
   does lots of "unusual" things in its build system, some of which break due
   to those patches, sometimes by gcc aborting, sometimes - and that's worse -
   by generating broken object code.
   Two options: use our toolchain (eg. make crosstools-i386) or enable the
   ANY_TOOLCHAIN Kconfig option if you're feeling lucky (no support in this
   case).
 * iasl (for targets with ACPI support)

Optional:

 * doxygen (for generating/viewing documentation)
 * gdb (for better debugging facilities on some targets)
 * ncurses (for 'make menuconfig' and 'make nconfig')
 * 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.