5841bf3ec4
The MT8186 platform fails to suspend due to premature wakeup by USB. In MT8186, we use low level latch to keep USB wakeup signal. However, hardware could latch a wrong signal if it debounces more than one time. As a result, it would enable wakeup function too early. To prevent this issue, we do the following modification: - Delay about 100 us to enable wakeup function in kernel drivers [1]. - To guarantee 100 us is enough, we need to disable the USB debounce by default in coreboot. According to section register 0x404 and 0x420 in "(CODA) MT8169_PERICFG_REG.xls" which is only for MediaTek internal use: The current default value of debounce register for MT8186 USB IP0 and IP1 is incorrect. The reason we add in coreboot is that the default value should be correct when SoC is booting up. This modification is only for MT8186. The subsequent SoCs will adjust the wakeup function to correct register value by default. [1]: 0d8cfeeef3f5 (usb: xhci-mtk: fix random remote wakeup) TEST=after stress test, not found premature wakeup by USB BUG=b:228773975 Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com> Change-Id: I296c4491c5959670a39fa8bd6ef987557bbc459f Reviewed-on: https://review.coreboot.org/c/coreboot/+/63858 Reviewed-by: Yu-Ping Wu <yupingso@google.com> Reviewed-by: Paul Menzel <paulepanter@mailbox.org> Reviewed-by: Hung-Te Lin <hungte@chromium.org> Tested-by: build bot (Jenkins) <no-reply@coreboot.org> |
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| LICENSES | ||
| configs | ||
| payloads | ||
| spd | ||
| src | ||
| tests | ||
| util | ||
| .checkpatch.conf | ||
| .clang-format | ||
| .editorconfig | ||
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| .gitreview | ||
| .mailmap | ||
| AUTHORS | ||
| COPYING | ||
| MAINTAINERS | ||
| Makefile | ||
| Makefile.inc | ||
| README.md | ||
| gnat.adc | ||
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README.md
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.