commit | dfe3a2fcfca5ade7d82ed7e92758e5f329c28880 | [log] [tgz] |
---|---|---|
author | Raul E Rangel <rrangel@chromium.org> | Fri Apr 16 12:16:55 2021 -0600 |
committer | Raul Rangel <rrangel@chromium.org> | Tue Apr 20 01:10:54 2021 +0000 |
tree | a1fb377724090e92540e0996046d72cc899e027e | |
parent | b922cbbdd6bad68f9d3c6f1c6de6b557646c5dbb [diff] |
soc/amd/{common,cezanne}: Add uPEP device The uPEP device is required to support S0i3. The device has been written in ASL to make it easier to read and maintain. The device constraints are purely informational. We use a dummy constraint like the Intel platforms to keep both linux and Windows functional. In order for this device to be used by the linux kernel the ACPI_FADT_LOW_PWR_IDLE_S0 flag must be set. So including it unconditionally doesn't cause any problems. The AMD Modern Standby BIOS Implementation Guide defines two UUIDs, one for getting the device constraints, and one for handling notifications. This differs from the Intel specification and the linux driver implementation. For this reason I haven't implemented any of the notification callbacks yet. BUG=b:178728116 TEST=Boot OS and verify _DSM is called: [ 0.226701] lps0_device_attach: ACPI: \_SB_.PEP_: _DSM function mask: 0x3 [ 0.226722] lpi_device_get_constraints_amd: ACPI: \_SB_.PEP_: _DSM function 1 eval successful [ 0.226723] lpi_device_get_constraints_amd: ACPI: \_SB_.PEP_: LPI: constraints list begin: [ 0.226724] lpi_device_get_constraints_amd: ACPI: \_SB_.PEP_: LPI: constraints list end Signed-off-by: Raul E Rangel <rrangel@chromium.org> Change-Id: I2deef47eabe702efe1a0f3747c9f27bcec37464b Reviewed-on: https://review.coreboot.org/c/coreboot/+/52445 Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com> Reviewed-by: Furquan Shaikh <furquan@google.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.