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coreboot for the Switch
1968b58010
We've decided that it is generally okay for coreboot to expect unaligned accesses to work. Trying to find all instances of unaligned access opportunities and working around them in software would be an unsustainable whack-a-mole contest. Instead, architectures and boards need to make sure they conform to this, which on ARM and ARM64 requires setting up paging early in the bootblock. Other architectures (x86, ARM64, MIPS) already generate code in this manner. ARM still had an -mno-unaligned-access flag hanging around that has been copied so many times its initial origin was lost in time (probably U-Boot). Let's remove it for consistency between architectures and to improve code generation. BRANCH=veyron BUG=None TEST=Booted Jerry and Blaze. Looked at the disassembly for timestamp_sync() and confirmed that it only gives you half as much eye cancer as before (GCC still somehow insists on byte accesses when zeroing fields which is very odd, but at least that terrible AND/OR mess is gone). Measured a boot time increase of about 11ms on Jerry (mostly faster timestamp and CBFS accesses). Could not test Storm because despite our claimed abundance of test devices, every time I get one of them it magically disappears again in less than a week. Change-Id: I8fc08cc7ce4471651a51ee795269909ef69277c8 Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Original-Commit-Id: 07591fadb89bd127fe065abf0b9ba3facecf1aeb Original-Change-Id: I1d046e05bb11822b86e467eafb6aa92e8fbce774 Original-Signed-off-by: Julius Werner <jwerner@chromium.org> Original-Reviewed-on: https://chromium-review.googlesource.com/241732 Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: http://review.coreboot.org/9728 Tested-by: build bot (Jenkins) Reviewed-by: Edward O'Callaghan <edward.ocallaghan@koparo.com> |
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| documentation | ||
| payloads | ||
| src | ||
| util | ||
| .gitignore | ||
| .gitmodules | ||
| .gitreview | ||
| COPYING | ||
| Makefile | ||
| Makefile.inc | ||
| README | ||
| toolchain.inc | ||
------------------------------------------------------------------------------- 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 http://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: * http://www.coreboot.org/Supported_Motherboards * http://www.coreboot.org/Supported_Chipsets_and_Devices Build Requirements ------------------ * gcc / g++ * make Optional: * doxygen (for generating/viewing documentation) * iasl (for targets with ACPI support) * gdb (for better debugging facilities on some targets) * ncurses (for 'make menuconfig') * flex and bison (for regenerating parsers) Building coreboot ----------------- Please consult http://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 http://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: http://www.coreboot.org You can contact us directly on the coreboot mailing list: http://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.