d1a74167a8
- Optional feature to provide mechanism to skip _OFF and _On execution.
- It is used for the device to skip _OFF and _ON during device driver
reload.
- OFSK is used to skip _OFF Method at the end of device driver removal.
- ONSK is used to skip _ON Method at the beginning of driver loading.
- General flow use case:
1. Device driver is removed by 'rmmod' command.
2. Device _RST is called. _RST perform reset.
3. Device increments OFSK in _RST to skip the following _OFF invoked by
OSPM.
4. OSPM invokes _OFF at the end of driver removal.
5. _OFF sees OFSK and skips current execution and decrements OFSK so that
_OFF will be executed normally next time.
6. _OFF increments ONSK to skip the following _ON invoked by OSPM.
7. Device driver is reloaded by 'insmod/modprobe' command.
8. OSPM invokes _ON at the beginning of driver loading.
9. _ON sees ONSK and skip current execution and decrements ONSK so that
_ON will be executed normally next time.
- In normal case:
When suspend, OSPM invokes _OFF. Since OFSK is zero, the device goes
to deeper state as expected.
When resume, OSPM invokes _ON. Sinc ONSK is zero, the device goes
to active state as expected.
- Generated changes:
PowerResource (RTD3, 0x00, 0x0000)
Name (ONSK, Zero)
Name (OFSK, Zero)
...
Method (_ON, 0, Serialized) // _ON_: Power On
{
If ((ONSK == Zero))
{
...
}
Else
{
ONSK--
}
}
Method (_OFF, 0, Serialized) // _OFF: Power Off
{
If ((OFSK == Zero))
{
...
}
Else
{
OFSK--
ONSK++
}
}
Test:
Enable and verify OFSK and ONSK Name objects and the if-condition logic
inside _OFF and _ON methods is added.
Signed-off-by: Cliff Huang <cliff.huang@intel.com>
Change-Id: Ic32d151d65107bfc220258c383a575e40a496b6f
Reviewed-on: https://review.coreboot.org/c/coreboot/+/61353
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
|
||
|---|---|---|
| 3rdparty | ||
| configs | ||
| Documentation | ||
| LICENSES | ||
| payloads | ||
| spd | ||
| src | ||
| tests | ||
| util | ||
| .checkpatch.conf | ||
| .clang-format | ||
| .editorconfig | ||
| .gitignore | ||
| .gitmodules | ||
| .gitreview | ||
| AUTHORS | ||
| COPYING | ||
| gnat.adc | ||
| MAINTAINERS | ||
| Makefile | ||
| Makefile.inc | ||
| README.md | ||
| 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 https://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:
Build Requirements
- make
- gcc / g++
Because Linux distribution compilers tend to use lots of patches. coreboot
does lots of "unusual" things in its build system, some of which break due
to those patches, sometimes by gcc aborting, sometimes - and that's worse -
by generating broken object code.
Two options: use our toolchain (eg. make crosstools-i386) or enable the
ANY_TOOLCHAINKconfig option if you're feeling lucky (no support in this case). - iasl (for targets with ACPI support)
- pkg-config
- libssl-dev (openssl)
Optional:
- doxygen (for generating/viewing documentation)
- gdb (for better debugging facilities on some targets)
- ncurses (for
make menuconfigandmake nconfig) - flex and bison (for regenerating parsers)
Building coreboot
Please consult https://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 https://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:
You can contact us directly on the coreboot mailing list:
https://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.