coreboot-kgpe-d16/payloads/libpayload
Jeremy Compostella 612ae2ec7c libpayload: use PRIu64 type to print u64
The appropriate way to print a u64 variable regardless of the current
architecture is to use the PRI*64 macros.  libpayload is mostly used
in 32 bits but when ported to other projects and compiled in 64 bits
it breaks the compilation.

Change-Id: I479fd701f992701584d77d43c5cd5910f5ab7633
Signed-off-by: Jeremy Compostella <jeremy.compostella@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45628
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
2020-09-30 10:16:44 +00:00
..
arch treewide/Kconfig: Drop unneeded empty lines 2020-09-21 16:30:14 +00:00
bin
configs libpayload/defconfig: Set default heap size to 1MiB 2020-08-17 06:10:49 +00:00
crypto payloads: Drop unneeded empty lines 2020-09-21 16:20:57 +00:00
curses payloads: Drop unneeded empty lines 2020-09-21 16:20:57 +00:00
drivers libpayload: use PRIu64 type to print u64 2020-09-30 10:16:44 +00:00
gdb
include payloads: Drop unneeded empty lines 2020-09-21 16:20:57 +00:00
libc libpayload: use PRIu64 type to print u64 2020-09-30 10:16:44 +00:00
libcbfs
liblz4
liblzma payloads: Drop unneeded empty lines 2020-09-21 16:20:57 +00:00
libpci
sample
tests
Doxyfile
Kconfig libpayload: cbgfx: Replace bilinear resampling with Lanczos 2020-07-09 00:32:17 +00:00
LICENSES
LICENSE_GPL
Makefile
Makefile.inc
README

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 https://www.coreboot.org for details on coreboot.


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

 $ git clone https://review.coreboot.org/coreboot.git

 $ cd coreboot/payloads/libpayload

 $ make menuconfig

 $ make

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

On x86 systems, libpayload will always be 32-bit even if your host OS runs
in 64-bit, so you might have to install the 32-bit libgcc version.
On Debian systems you'd do 'apt-get install gcc-multilib' for example.

Run 'make distclean' before switching boards. This command will remove
your current .config file, so you need 'make menuconfig' again or
'make defconfig' in order to set up configuration. Default configuration
is based on 'configs/defconfig'. See the configs/ directory for examples
of configuration.


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 https://www.coreboot.org/Libpayload.

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


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

See LICENSES.