coreboot-kgpe-d16/payloads/libpayload
Marcelo Povoa 558e9b55c8 libpayload: Add minimal support for PL011 UART
This creates a new PL011 config variable which avoids the
infinite busy wait on serial_putchar() because the register
mapping is not compatible with current implementation.

BUG=None
BRANCH=none
TEST=printf() works on the PL011 based ARMv8 foundation model

Original-Change-Id: I9feda35a50a3488fc504d1561444161e0889deda
Original-Signed-off-by: Marcelo Povoa <marcelogp@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/187020
Original-Reviewed-by: David Hendricks <dhendrix@chromium.org>
(cherry picked from commit 85779a34a161c324cc8af995ada4393137275f20)
Signed-off-by: Marc Jones <marc.jones@se-eng.com>

Conflicts:
	payloads/libpayload/Config.in
	payloads/libpayload/drivers/serial.c

Change-Id: I23c8b3728cd7d2d7692b3e86a679e061e88f7bb5
Reviewed-on: http://review.coreboot.org/7422
Tested-by: build bot (Jenkins)
Reviewed-by: David Hendricks <dhendrix@chromium.org>
2014-11-13 06:23:17 +01:00
..
arch libpayload: timer: Move the timer drivers from depthcharge to libpayload. 2014-11-13 06:23:07 +01:00
bin ARM: Generalize armv7 as arm. 2014-09-08 18:59:23 +02:00
configs libpayload: Remove config.panther 2014-11-13 06:22:25 +01:00
crypto libpayload: Change CONFIG_* to CONFIG_LP_* in the kconfig. 2014-08-05 18:44:08 +02:00
curses libpayload: Change CONFIG_* to CONFIG_LP_* in the kconfig. 2014-08-05 18:44:08 +02:00
drivers libpayload: Add minimal support for PL011 UART 2014-11-13 06:23:17 +01:00
include arm: Redesign, clarify and clean up cache related code 2014-11-10 21:34:49 +01:00
libc libpayload: Add a timer_us() function. 2014-09-15 19:01:03 +02:00
libcbfs cbfs: Fix overwalk on file scan 2014-08-10 22:25:07 +02:00
liblzma LZMA: Add a version of ulzma which takes the input and output buffer sizes. 2014-08-10 22:29:51 +02:00
libpci libpayload: minor cleanups 2012-04-04 00:40:31 +02:00
sample libpayload: Fix missed CONFIG_ -> CONFIG_LP_ substitutions 2014-10-17 11:24:15 +02:00
tests libpayload: Change CONFIG_X86_SERIAL_CONSOLE to CONFIG_8250_SERIAL_CONSOLE 2014-08-28 01:40:48 +02:00
util libpayload: also support armv7-a toolchain 2014-10-16 15:54:16 +02:00
Config.in libpayload: Add minimal support for PL011 UART 2014-11-13 06:23:17 +01:00
Doxyfile
LICENSES
Makefile libpayload: Don't use default path for kconfig 2014-10-17 11:25:10 +02:00
Makefile.inc libpayload: Build libpayload with debugging info turned up all the way. 2014-09-29 19:29:30 +02:00
README libpayload, superiotool: README: Prepend `coreboot/` to path of change directory line 2013-04-04 17:22:15 +02:00

README

-------------------------------------------------------------------------------
libpayload README
-------------------------------------------------------------------------------

libpayload is a minimal library to support standalone payloads
that can be booted with firmware like coreboot. It handles the setup
code, and provides common C library symbols such as malloc() and printf().

Note: This is _not_ a standard library for use with an operating system,
rather it's only useful for coreboot payload development!
See http://coreboot.org for details on coreboot.


Installation
------------

 $ git clone http://review.coreboot.org/p/coreboot.git

 $ cd coreboot/payloads/libpayload

 $ make menuconfig

 $ make

 $ sudo make install (optional, will install into /opt per default)

As libpayload is for 32bit x86 systems only, you might have to install the
32bit libgcc version, otherwise your payloads will fail to compile.
On Debian systems you'd do 'apt-get install gcc-multilib' for example.


Usage
-----

Here's an example of a very simple payload (hello.c) and how to build it:

 #include <libpayload.h>

 int main(void)
 {
     printf("Hello, world!\n");
     return 0;
 }

Building the payload using the 'lpgcc' compiler wrapper:

 $ lpgcc -o hello.elf hello.c

Please see the sample/ directory for details.


Website and Mailing List
------------------------

The main website is http://www.coreboot.org/Libpayload.

For additional information, patches, and discussions, please join the
coreboot mailing list at http://coreboot.org/Mailinglist, where most
libpayload developers are subscribed.


Copyright and License
---------------------

See LICENSES.