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Furquan Shaikh 7731cddaa2 t210: SPI driver cleanup
1. Get rid of spi_delay - Instead have a tight loop to check for the
spi status
2. The first check for SPI operation complete i.e. FIFOs have been
processed is the SPI_STATUS_RDY bit. Thus, tegra_spi_wait should check
for this bit before reading BLOCK_COUNT or any other fifo count field.
3. Flush both TX and RX FIFOs for SEND and RECV operations for PIO and
DMA.
4. No need to check for rx_fifo_count == spi_byte_count to determine
pio_finish operation. RDY bit should be sufficient to ensure that the
SPI operation is complete. Added assert to ensure we never hit the
case of RDY bit being set, yet rx_fifo_count != spi_byte_count for
PIO.

BUG=chrome-os-partner:41877
BRANCH=None
TEST=Compiles successfully and reboot test runs successfully for 10K+ iterations.

Change-Id: I1adb9672c1503b562309a8bc6c22fe7d2271768e
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: de1515605e17e0c6b81874f9f3c49fd0c1b92756
Original-Change-Id: I5853d0df1bfd6020a17e478040bc4c1834563fe4
Original-Signed-off-by: Furquan Shaikh <furquan@google.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/285141
Original-Reviewed-by: Jimmy Zhang <jimmzhang@nvidia.com>
Original-Tested-by: Jimmy Zhang <jimmzhang@nvidia.com>
Original-Reviewed-by: Furquan Shaikh <furquan@chromium.org>
Original-Tested-by: Furquan Shaikh <furquan@chromium.org>
Original-Commit-Queue: Furquan Shaikh <furquan@chromium.org>
Original-Trybot-Ready: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: http://review.coreboot.org/10947
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
2015-07-16 22:37:11 +02:00
3rdparty vboot: Don't count boot attempts if lid is closed 2015-07-08 19:40:24 +02:00
Documentation Remove empty lines at end of file 2015-06-08 00:55:07 +02:00
payloads libpayload: assume cbfs file alignment is 64 byte 2015-07-15 16:34:50 +02:00
src t210: SPI driver cleanup 2015-07-16 22:37:11 +02:00
util release: add release script 2015-07-16 17:40:42 +02:00
.gitignore version: allow stating the coreboot revision in .coreboot-version 2015-07-13 21:00:59 +02:00
.gitmodules submodules: add arm-trusted-firmware third-party repository 2015-06-23 08:20:24 +02:00
.gitreview add .gitreview 2012-11-01 23:13:39 +01:00
COPYING update license template. 2006-08-12 22:03:36 +00:00
MAINTAINERS MAINTAINERS: grab build system responsibility 2015-05-22 22:47:03 +02:00
Makefile Makefile: Use variables defined for Kconfig 2015-06-30 18:53:54 +02:00
Makefile.inc cbfstool: fix alignment to 64 byte 2015-07-15 16:34:30 +02:00
README Update README with newer version of the text from the web page 2011-06-15 10:16:33 +02:00
toolchain.inc toolchain: Add -mgeneral-regs-only to CFLAGS for arm64 2015-07-16 22:35:50 +02:00

README

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