df5062215f
The Fast Read Dual Output and Fast Read Dual I/O commands are practically identical, the only difference being how the read address is transferred (saving a whooping 2 bytes which is totally irrelevant for the amounts of data coreboot tends to read). We originally implemented Fast Read Dual Output since it's the older command and some older Winbond chips only supported that one... but it seems that some older Macronix parts for whatever reason chose to only support Fast Read Dual I/O instead. So in order to make this work for as many parts as possible, I guess we'll have to implement both. (Also, the Macronix device ID situation is utter madness with different chips with different capabilities often having the same ID, so we basically have to make a best-effort guess to strike a trade-off between fast speeds and best chance at supporting all chips. If this turns out to be a problem later, we may have to add Kconfig overrides for this or resort to SFDP parsing, although that would defeat the whole point of trying to be fast.) BUG=b:193486682 TEST=Booted CoachZ (with Dual I/O) Signed-off-by: Julius Werner <jwerner@chromium.org> Change-Id: Ia1a20581f251615127f132eadea367b7b66c4709 Reviewed-on: https://review.coreboot.org/c/coreboot/+/56287 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Furquan Shaikh <furquan@google.com> |
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| payloads | ||
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| util | ||
| .checkpatch.conf | ||
| .clang-format | ||
| .editorconfig | ||
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| .gitreview | ||
| AUTHORS | ||
| COPYING | ||
| MAINTAINERS | ||
| Makefile | ||
| Makefile.inc | ||
| README.md | ||
| gnat.adc | ||
| toolchain.inc | ||
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.