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jinkun.hong d4a227ba05 rk3288: Fix failing DDR3 reboot test
We want a reset signal to last 200us. The length of a reset signal is
represented by BIT0~BIT16 in DDR_PUBL_PTR2. When DDR memory runs at
667MHz, the calculated value for the reset signal is 0x20850, which is
bigger than the maximum value that can be described with 17 bits
(0x1ffff). As a result, the memory controller only sees 0x850, which
generates a 3.5us reset cycle instead, which violates the standard and
negatively impacts memory stability.
So instead, we now set it to the maximum value (0x1ffff) to prevent this
overflow, resulting in a reset signal of 196us for 667MHz DDR memory.

BUG=chrome-os-partner:34875
TEST=loop reboot
BRANCH=veyron

Change-Id: Ia01f8a0414b49fa3ecf4d543cfa1822e29ee4cc4
Signed-off-by: Stefan Reinauer <reinauer@chromium.org>
Original-Commit-Id: 767a4a3cb8dff47cb15064d335b78ffa5815914d
Original-Change-Id: I9b410e1605c87f12a5ca96ead12f8527ca4f417f
Original-Signed-off-by: jinkun.hong <jinkun.hong@rock-chips.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/242175
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: http://review.coreboot.org/9653
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
2015-04-15 22:09:55 +02:00
3rdparty@892a6976ba 3rdparty: move checkout marker forward 2015-04-14 01:09:51 +02:00
documentation documentation: define downstream data consumption rules 2015-04-07 00:20:13 +02:00
payloads Danger: Initial mainboard import 2015-04-15 16:48:48 +02:00
src rk3288: Fix failing DDR3 reboot test 2015-04-15 22:09:55 +02:00
util timestamps: You can never have enough of them! 2015-04-14 09:03:40 +02:00
.gitignore .gitignore: add the doxygen directory. 2014-12-14 23:30:45 +01:00
.gitmodules nvidia/cbootimage: avoid upstream's build system 2014-10-02 10:26:58 +02:00
.gitreview
COPYING
Makefile build system: run linker scripts through the preprocessor 2015-04-06 19:14:00 +02:00
Makefile.inc CBFS: Correct ROM_SIZE for ARM boards, use CBFS_SIZE for cbfstool 2015-04-14 09:01:23 +02:00
README
toolchain.inc mips: mips, not mipsel 2015-03-29 22:38:57 +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.