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Hung-Te Lin 2cfdb78d9d nyan*: Clear VDDIO_SDMMC3 to reset SD card reader.
When across warm reset, if VDD_3V3_SD_CARD gets power-cycled but VDDIO_SDMMC3
does not, we will get ~1.5V leakage on VDD. To fix that, we reset VDDIO_SDMMC3
to 0 along with VDD_3V3_SD_CARD in Coreboot.  Payloads must turn on VDDIO_SDMMC3
explicitly before accessing SD card.

Note the warnings of "VDD_SDMMC must set early" in comment seems only happens on
U-Boot and can be removed.

BUG=chrome-os-partner:27053
BRNACH=nyan
TEST=Ctrl-U to boot from SD card, login and type "reboot", then Ctrl-U to boot
     again. Without this patch, system will fail in loading kernel.

Change-Id: I7f85995317d18587d514ea3afcff3bfea0a33e93
Signed-off-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/196961
Reviewed-by: Gabe Black <gabeblack@chromium.org>
Tested-by: Andrew Bresticker <abrestic@chromium.org>
2014-04-26 04:20:35 +00:00
configs storm: use correct location for SBL blobs 2014-04-24 21:52:54 +00:00
documentation sconfig: rename lapic_cluster -> cpu_cluster 2013-02-14 07:07:20 +01:00
payloads libpayload: usb: Detach unused USB devices 2014-04-17 21:15:49 +00:00
src nyan*: Clear VDDIO_SDMMC3 to reset SD card reader. 2014-04-26 04:20:35 +00:00
util ipq8064: SBL headers must have 4 byte aligned blob sizes 2014-04-22 20:26:25 +00:00
.gitignore rmodules: add support for rmodtool 2014-03-31 22:25:57 +00:00
COMMIT-QUEUE.ini COMMIT-QUEUE.ini: Add documentation. 2013-11-01 14:08:42 +00:00
COPYING update license template. 2006-08-12 22:03:36 +00:00
Makefile armv8: add support for armv8 cpu 2014-01-07 02:48:47 +00:00
Makefile.inc Provide a way to compile some files with -O0 option 2014-04-25 01:54:16 +00:00
PRESUBMIT.cfg chromeos: Add PRESUBMIT.cfg 2013-05-01 14:31:10 -07:00
README Update README with newer version of the text from the web page 2011-06-15 10:16:33 +02:00

-------------------------------------------------------------------------------
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.