b217baa4ee
Element Self Description register (ESD) [23:16] is R/WO, so let write the ESD.CID when we start ich7_setup_root_complex_topology. This value is also used to program the R/WO 'Target Component ID' registers of RPxD and HHD. Once it is done, no need to rewrite on them as they become RO. (For more information, please see ICH7 datasheet page 271.) Tested done on 945G-M4 using printk before and after writing. Before this change, writing on those registers had no effect: ESD: 0x0104: 0x00000802 ULD: 0x0110: 0x00000001 ULBA: 0x0118: 0x00000000 RP1D: 0x0120: 0x01000003 RP2D: 0x0130: 0x02000003 RP3D: 0x0140: 0x03000002 RP4D: 0x0150: 0x04000002 HDD: 0x0160: 0x0f000002 RP5D: 0x0170: 0x05000002 RP6D: 0x0180: 0x06000002 Using this patche, those R/WO get the "right" values. i.e., We can see RCBA32(ULBA) is now equal to (uintptr_t)DEFAULT_DMIBAR. ESD: 0x0104: 0x00020802 ULD: 0x0110: 0x01010001 ULBA: 0x0118: 0xfed18000 RP1D: 0x0120: 0x01020003 RP2D: 0x0130: 0x02020003 RP3D: 0x0140: 0x03020002 RP4D: 0x0150: 0x04020002 HDD: 0x0160: 0x0f020002 RP5D: 0x0170: 0x05020002 RP6D: 0x0180: 0x06020002 Change-Id: I3f2199d6da22ce9995496c2a81363710edde81f3 Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr> Reviewed-on: https://review.coreboot.org/c/coreboot/+/30993 Reviewed-by: Patrick Georgi <pgeorgi@google.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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:
- https://www.coreboot.org/Supported_Motherboards
- https://www.coreboot.org/Supported_Chipsets_and_Devices
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.