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Ben Kao 6eb5253451 soc/intel/jasperlake: Set xHCI LFPS period sampling off time 
Provide an option to set xHCI LFPS period sampling off time
(SS_U3_LFPS_PRDC_SAMPLING_OFFTIME_CTRL in JSL EDS revision 2.0).
If the option is set in the devicetree, the bits[7:4] in
xHCI MMIO BAR + offset 0x80A4 (PMCTRL_REG) will be updated.

The host will sample LFPS for U3 wake-up detection when suspended, but
it doesn't sample LFPS at all time due to power management, the
default xHCI LFPS period sampling off time is 9ms. If the xHCI LFPS
period sampling off time is not 0ms, the host may miss the
device-initiated U3 wake-up and causes some kind of race condition for
U3 wake-up between the host and the device.

BUG=b:187801363, b:191426542
TEST=build coreboot with xhci_lfps_sampling_offtime_ms and flash
the image to the device. Run following command to check the bits[7:4]:
iotools mmio_read32 "XHCI MMIO BAR + 0x80A4"

Signed-off-by: Ben Kao <ben.kao@intel.com>
Change-Id: I0e13b7f51771dc185a105c5a84a8e377ee4d7d73
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56063
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
2021-07-26 05:00:51 +00:00
3rdparty 3rdparty/qc_blobs: Uprev to new HEAD (e96cde2) 2021-07-24 05:37:23 +00:00
configs configs: Explicitly specify vendor and mainboard 2021-07-07 05:48:25 +00:00
Documentation Documentation: Remove KASAN from the project ideas list 2021-07-14 08:15:20 +00:00
LICENSES treewide: Remove trailing whitespace 2021-02-17 17:30:05 +00:00
payloads payloads: FILO: Hook up autoboot options 2021-07-19 09:20:52 +00:00
src soc/intel/jasperlake: Set xHCI LFPS period sampling off time 2021-07-26 05:00:51 +00:00
tests tests/Makefile.inc: Correct dependency file suffix 2021-07-21 16:22:21 +00:00
util util/cbfstool: Remove unused pagesize parameter 2021-07-17 13:45:45 +00:00
.checkpatch.conf lint: checkpatch: Only exclude specific src/vendorcode/ subdirectories 2021-04-06 16:04:41 +00:00
.clang-format
.editorconfig
.gitignore .gitignore: Ignore .test/.dependencies globally 2020-10-31 18:21:36 +00:00
.gitmodules .gitmodules: Update intel-microcode submodule to track branch=main 2021-06-09 17:20:50 +00:00
.gitreview
AUTHORS AUTHORS, util/: Drop individual copyright notices 2020-05-09 21:21:32 +00:00
COPYING
gnat.adc treewide: Remove "this file is part of" lines 2020-05-11 17:11:40 +00:00
MAINTAINERS Revert "src/mainboard: Add Star Labs labtop series" 2021-06-04 18:52:32 +00:00
Makefile util/kconfig: Uprev to Linux 5.13's kconfig 2021-07-13 20:28:14 +00:00
Makefile.inc build system: Deduplicate symbols in objdump 2021-07-23 15:06:56 +00:00
README.md
toolchain.inc toolchain.inc: copy architecture specific CFLAGS to GCC_ADAFLAGS 2021-07-01 09:43:54 +00:00

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_TOOLCHAIN Kconfig 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 menuconfig and make 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:

https://www.coreboot.org

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.