commit | 45f449416d3929a875bff76c9ee534ca9aac9dcc | [log] [tgz] |
---|---|---|
author | Werner Zeh <werner.zeh@siemens.com> | Tue Apr 27 11:40:17 2021 +0200 |
committer | Patrick Georgi <pgeorgi@google.com> | Sun May 02 21:53:03 2021 +0000 |
tree | 1dc8031f2f1f4f7a09c3e7567b189a0a86691f3d | |
parent | 0e351c9607290b72bd024ceef69afe848e0ed6d5 [diff] |
mb/siemens/mc_apl{1,2,3,5,6}: Tune I2C frequency All the boards in the patch have a constraint for the I2C bus to operate on 100 kHz. Provide dedicated values for rise time, fall time and data hold time on mainboard level to get a proper timing which takes the bus load into account. Giving these values the driver computes the needed timings correctly. TEST=Measure I2C frequency on all boards while coreboot accesses external RTC and make sure it is 100 kHz. Change-Id: Iab634190bda5fa2a4fdf2ebaa1e45ac897d84deb Signed-off-by: Werner Zeh <werner.zeh@siemens.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/52721 Reviewed-by: Mario Scheithauer <mario.scheithauer@siemens.com> Reviewed-by: Furquan Shaikh <furquan@google.com> Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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.
After the basic initialization of the hardware has been performed, any desired "payload" can be started by coreboot.
See https://www.coreboot.org/Payloads for a list of supported payloads.
coreboot supports a wide range of chipsets, devices, and mainboards.
For details please consult:
ANY_TOOLCHAIN
Kconfig option if you're feeling lucky (no support in this case).Optional:
make menuconfig
and make nconfig
)Please consult https://www.coreboot.org/Build_HOWTO for details.
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 https://www.coreboot.org/QEMU for details.
Further details on the project, a FAQ, many HOWTOs, news, development guidelines and more can be found on the coreboot website:
You can contact us directly on the coreboot mailing list:
https://www.coreboot.org/Mailinglist
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.