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This patch runs basic NAND initialization code on Proto 0.2 boards which have been reworked for NAND. It makes sense to do this in coreboot for two reasons: - In general, it is reasonable for coreboot to initialize clocks and such in preparation for depthcharge's use. Waiting times can be pooled, and the initialization itself here is very fast. - There is a kernel bug which requires that the clock is already initialized before the kernel loads NAND support. coreboot is a more sensible place to put a workaround than depthcharge because depthcharge initializes things lazily, but when booting from USB, depthcharge won't need to look at NAND. This change involves bringing in an additional header file, ebi2.h, from U-Boot. TEST=Booted a kernel from USB and verified that NAND came up without any depthcharge hacks, whereas previously a USB-booted kernel would be unable to access NAND even with the same drivers compiled in due to an initialization failure. BUG=chromium:403432 BRANCH=none Change-Id: I04e99cb39d16848a6ed75fe0229b8f79bdf2e035 Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Original-Commit-Id: 9be29da5ccad9982f146ae00344f30598ef2371c Original-Signed-off-by: Dan Ehrenberg <dehrenberg@chromium.org> Original-Change-Id: I1760ecb4e47438311d80e34326e45578c608481c Original-Reviewed-on: https://chromium-review.googlesource.com/225277 Original-Reviewed-by: Vadim Bendebury <vbendeb@chromium.org> Reviewed-on: http://review.coreboot.org/9402 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi <pgeorgi@google.com>
------------------------------------------------------------------------------- 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.