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coreboot for the Switch
1682b8d97a
Due to the CST entries the machine uses less power running GNU/Linux-libre. This can be seen by monitoring CPU temperature and time left the machine can run on battery. CPU temperature measurements have been done with lm_sensors, battery querying with acpi. Tests have been done before applying this patch and after. In both cases the battery was fully loaded and the machine powered up on battery, without AC. In both tests the machine was idleing for more than 1 hour. Without this patch battery was predicted to last 01:52:30 hours, CPU temperature first measurement showed 38 degrees. After 15 min idle, temperature has reached its maximum value in this test of 61 and 62 degrees (Core 0 and 1). Fan speed begins to increase shortly after 15 min. From its minimal value 1800 rpm it reaches 3100 rpm after 40 min. CPU temperature did not increase any further. After 60 min idle, the battery was predicted to still last 57 min. With this patch battery was predicted to last 02:22:40 hours. That is plus 30 min. CPU temperature begins at 35 degrees. After 15 min temperature has reached 45 degrees; after 30 min it has reached the maximal temperature during this test of about 50 degrees. That is 10 degrees improvement. The fan stayed at minimal speed. After 60 min idle, the battery was predicted to still last 01:22:48 hours; a 25 minute improvement. Change-Id: I6b2173df1dc09300329b61b51b79f4b9f4a8fb13 Signed-off-by: Axel Holewa <mono@posteo.de> Reviewed-on: http://review.coreboot.org/7923 Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com> Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com> |
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| 3rdparty@a8b0c52850 | ||
| 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.