No description
f3d5736c8f
The eMMC enable pin is in a 3.3V IO domain. Unfortunately the eMMC expects this pin to be 1.8V. The way we were driving this pin would cause the eMMC to pull power through this pin and that was causing current leaks. In future revisions of hardware we should move this pin somewhere more legit. However, in the current hardware we can get things working pretty well by using a pullup to "drive" this pin. This will work in conjunction with the external 100K pullup to give a somewhat reasonable voltage. The eMMC will also not be able to pull much current through this pin, so it can't leak too badly. BRANCH=none BUG=chrome-os-partner:33319 TEST=Boot a kernel that doesn't touch the mux/pulls and see no leak: dut-control --port=${SERVO} vcc_flash_ma -t 5 Change-Id: Ibc25cd090d826c8215be24a0b5c11d97b5281700 Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Original-Commit-Id: 26e7a9d7e067ed4dd859387ee63bf654ab9dc529 Original-Change-Id: Iadfc1477cd478773cc9d159e3fbc22b66b8f0f78 Original-Signed-off-by: Doug Anderson <dianders@chromium.org> Original-Reviewed-on: https://chromium-review.googlesource.com/226039 Original-Reviewed-by: Julius Werner <jwerner@chromium.org> Reviewed-on: http://review.coreboot.org/9545 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org> |
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3rdparty@2bc495fd31 | ||
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.