No description
573429b09d
Currently the rt5677 codec outputs 6MHz PDM clock which is out-of-spec for the speaker amp SSM2537. The amp's GAIN_FS pin is pulled down to PGND with a 47k resistor, so the expected PDM clock is 64*FS (~3MHz) according to its datasheet. The corresponding kernel patch that adds the PDM clock config option is https://chromium-review.googlesource.com/#/c/230303/ BUG=chrome-os-partner:33303 BRANCH=samus TEST=flash coreboot with this patch and see PDM CLK went from 6MHz to 3MHz on samus with a scope. Change-Id: Icf2c61930175bede1ee8ebc2b0fb17c2938b806c Signed-off-by: Stefan Reinauer <reinauer@chromium.org> Original-Commit-Id: b9ba4597515b2fbcc72fa22e296357c454175648 Original-Change-Id: I09acdf47bab4f641981491a84197de234918435e Original-Signed-off-by: Ben Zhang <benzh@chromium.org> Original-Reviewed-on: https://chromium-review.googlesource.com/230344 Original-Reviewed-by: Dylan Reid <dgreid@chromium.org> Original-Reviewed-by: Duncan Laurie <dlaurie@chromium.org> Reviewed-on: http://review.coreboot.org/9277 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi <pgeorgi@google.com> |
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3rdparty@2bc495fd31 | ||
documentation | ||
payloads | ||
src | ||
util | ||
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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.