Files
system76-coreboot/payloads/libpayload
Christian Ruppert 74b659992b Respect linker order
Linking fails when using -Wl,--as-needed and/or esp. when forcing --as-needed
through a compiler specs file.
A proper compile/link command would look like: $(CC) $(CFLAGS) $(LDFLAGS) -o foo
$(OBJS) $(LIBS). So the *FLAGS must be passed *before* the objects while the
libraries/dependencies must be passed *after* the objects.
For more details see: http://www.gentoo.org/proj/en/qa/asneeded.xml

Change-Id: I5a5b05e1cab8a2d88ce56c92d9b2f991ca1ee6c0
Signed-off-by: Christian Ruppert <idl0r@qasl.de>
Reviewed-on: http://review.coreboot.org/494
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
2011-12-21 16:27:01 +01:00
..
2011-08-04 08:11:21 +02:00
2011-11-02 10:49:24 +01:00
2011-08-04 08:11:21 +02:00
2011-12-21 16:27:01 +01:00
2011-08-04 08:11:21 +02:00
2011-07-03 14:47:48 +02:00
2011-08-04 08:11:21 +02:00
2011-03-29 19:29:01 +00:00

-------------------------------------------------------------------------------
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
------------

 $ svn co svn://coreboot.org/coreboot/trunk/payloads/libpayload

 $ cd 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.