No description
1f4e283560
The PMIC setup code was unconditionally waiting for 10ms after each register write. It might be possible for there to be an excess of current from lots of rails switching around at the same time, but we can avoid that with a much shorter delay in a few strategic places. This change also moves the write to LDO3 to just under SD1 because LDO3 should track SD1. The duration and position for the delays and moving LDO3 were provided by Dan Coggin at nvidia. BUG=chrome-os-partner:25467 TEST=Built and booted on nyan rev1. Measured a 230 ms decrease in boot time. BRANCH=None Original-Change-Id: I14805bf1b6242bdd0b286f37ae7d635c03909677 Original-Signed-off-by: Gabe Black <gabeblack@google.com> Original-Reviewed-on: https://chromium-review.googlesource.com/189016 Original-Tested-by: Gabe Black <gabeblack@chromium.org> Original-Reviewed-by: Gabe Black <gabeblack@chromium.org> Original-Reviewed-by: Daniel Coggin <dcoggin@nvidia.com> Original-Commit-Queue: Gabe Black <gabeblack@chromium.org> (cherry picked from commit 06c4d346deeb47809cd88655a9fa6712ceef9491) Signed-off-by: Marc Jones <marc.jones@se-eng.com> Change-Id: I3ce0bdeb4ee60499f6c192fe0803a4cab3d7a8af Reviewed-on: http://review.coreboot.org/7419 Tested-by: build bot (Jenkins) Reviewed-by: David Hendricks <dhendrix@chromium.org> |
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| 3rdparty@27bdb5e8a6 | ||
| documentation | ||
| payloads | ||
| src | ||
| util | ||
| .gitignore | ||
| .gitmodules | ||
| .gitreview | ||
| COPYING | ||
| Makefile | ||
| Makefile.inc | ||
| README | ||
| toolchain.inc | ||
------------------------------------------------------------------------------- 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.