Files
system76-coreboot/payloads/libpayload
Daisuke Nojiri 03e8188a3f cbfs: fix printf for 64bit architectures
BUG=none
BRANCH=smaug
TEST=Built for Smaug

Original-Change-Id: I7ff577f97252265ca6c96963ca44a6fbd0de9f7a
Original-Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/290049
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Original-(cherry picked from commit 9cff308653766ea81978214e99a3d740aff4dbbe)
Original-Reviewed-on: https://chromium-review.googlesource.com/290116
Original-Reviewed-by: Stefan Reinauer <reinauer@chromium.org>

Change-Id: I5dcc17e0a42b46350fe6c398767f8155bdd0fd9d
Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-on: http://review.coreboot.org/11177
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
2015-08-14 15:13:39 +02:00
..
2015-08-10 20:29:07 +02:00
2015-05-21 20:50:25 +02:00
2015-06-08 00:55:07 +02:00
2015-06-08 00:55:07 +02:00
2015-06-08 00:55:07 +02:00
2015-06-08 00:55:07 +02:00

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