| commit | 47b7b3402b0864e5c782705bc24e4bf143c3c7f3 | [log] [tgz] |
|---|---|---|
| author | Duncan Laurie <dlaurie@google.com> | Fri May 15 15:39:08 2020 -0700 |
| committer | Duncan Laurie <dlaurie@chromium.org> | Tue Jun 02 18:06:37 2020 +0000 |
| tree | b12bb7e9d75ff2e3e3e2a10b5cb9be21b2a97ded | |
| parent | 36e6c6f8d2b63428b0829ff615903715766b8c20 [diff] |
sconfig: Add support for firmware configuration
This change adds support to sconfig for generating the firmware
configuration field and option definitions in devicetree.cb.
In addition these fields and options can be used to probe for a device
and have that device be disabled if it is not found at boot time.
New tokens:
fw_config: top level token, table can be defined before chips
field: define field in the mask with the start and end bits
option: define option in a field with the value of the field
probe: indicate that a device should probe by field and option
Example:
fw_config
field FEATURE 0 0
option DISABLE 0
option ENABLE 1
end
end
chip drivers/generic/feature
device generic 0 on
probe FEATURE ENABLE
end
end
Variants can add new fields and add new options to existing fields in
overridetree.cb but cannot redefine an existing option.
Devices can have multiple probe tokens, and the device will be considered
to be found if any of them return true.
The output from defining this field are:
1) the various fields and options will be added as macro constants to
static.h and can be used by fw_config for probing.
2) the probe entries will result in a list of fields/options to probe
that is added to the resulting struct device and handled by coreboot.
BUG=b:147462631
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Change-Id: I8aea63e577d933aea09e0d0b09470929cc96e0de
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41440
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
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.