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Julius Werner e244986e40 rk3288: Increase PD_BUS_ACLK (SRAM clock) to improve boot speed
This patch doubles the ACLK peripheral clock for the PD_BUS power domain
to 297MHz, which is the closest to the maximum of 300MHz we can reach by
dividing GPLL. This frequency directly translates into SRAM speed, so
maximizing it has a huge impact on boot speed (especially with the lack
of SRAM caching).

BUG=chrome-os-partner:32987
TEST=Booted Veyron_Pinky. Hacked timestamps into vboot and confirmed
that the (visibly) long signature verification times are nearly halved.

Change-Id: Iafa3044854a4058a7f885c775119d964a6295de4
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: c230585f4344d0eab4f8eeaa761869965f2da08a
Original-Change-Id: I3f19eaa3d97dcc6235d820c71eb5edf2ae87d647
Original-Signed-off-by: Julius Werner <jwerner@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/224524
Original-Trybot-Ready: Doug Anderson <dianders@chromium.org>
Original-Reviewed-by: David Hendricks <dhendrix@chromium.org>
Reviewed-on: http://review.coreboot.org/9600
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
2015-04-13 17:41:59 +02:00
3rdparty@2bc495fd31 3rdparty: Update submodule to get Tegra 132 binaries 2015-03-07 17:50:58 +01:00
documentation documentation: define downstream data consumption rules 2015-04-07 00:20:13 +02:00
payloads serial: Combine Tegra and Rockchip UARTs to generic 8250_mmio32 2015-04-10 07:50:21 +02:00
src rk3288: Increase PD_BUS_ACLK (SRAM clock) to improve boot speed 2015-04-13 17:41:59 +02:00
util util/ipqheader: Add utility to create uber-SBL for IPQ8064 2015-04-13 17:36:27 +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 Makefile.inc: Only add `-Wno-unused-but-set-variable` for GCC 2015-04-08 15:42:37 +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.