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Add more details to documentation.

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Joel Sherrill 2012-03-09 13:04:44 -06:00
parent e392fdb762
commit 455aa3afe4
1 changed files with 54 additions and 5 deletions
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59
libbsd.txt
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@ -59,9 +59,10 @@ for details on the code itself.
=== Automatically Generated FreeBSD Files
The FreeBSD source tarball includes a file named Makefile.rtems which
has stanzas to automatically generate some files.
has stanzas to automatically generate some files using awk. For details
on this, see http://www.freebsd.org/cgi/man.cgi?query=kobj&apropos=0&sektion=0&manpath=FreeBSD+9.0-RELEASE&arch=default&format=html
http://www.freebsd.org/cgi/man.cgi?query=kobj&apropos=0&sektion=0&manpath=FreeBSD+9.0-RELEASE&arch=default&format=html
XXX This needs more detail.
=== Rules for Modifying FreeBSD Source
@ -78,10 +79,44 @@ pre-merged. The Makefile in this kit is automatically generated.
Any changes to sources in the freebsd or contrib directories will need to
be merged upstream into our master FreeBSD svn checkout.
=== Building git
=== Building RTEMS libbsd source
You need to configure RTEMS for the desired BSP and install it. Then edit
the file config.inc to set RTEMS_MAKEFILE_PATH appropriately.
You need to configure RTEMS for the desired BSP and install it. The
following is the script used to build the powerpc/psim BSP for our
internal testing purposes:
[listing]
----
#! /bin/sh
cd ${HOME}/newbsd
rm -rf b-psim
mkdir b-psim
cd b-psim
../git/rtems/configure --target=powerpc-rtems4.11 \
--enable-rtemsbsp=psim --disable-networking \
--enable-tests=samples \
--prefix=${HOME}/newbsd/bsp-install >c.log 2>&1 && \
make >b.log 2>&1 && \
make install >i.log 2>&1
echo $?
----
Then edit the file config.inc to set RTEMS_MAKEFILE_PATH appropriately
to indicate the ${prefix}/${target}/${BSP}. Continuing on the above,
the config.inc used to match the above is:
[listing]
----
RTEMS_MAKEFILE_PATH = ${HOME}/newbsd/bsp-install/powerpc-rtems4.11/psim/
INSTALL_BASE = ${HOME}/newbsd/install
----
The above installs the RTEMS libbsd kit into a separate place from
RTEMS and the BSP. The RTEMS libbsd tests are built against an installed
image of the RTEMS libbsd. By keeping it in a separate installation point
from RTEMS itself, this makes it easier to remove a libbsd installation
and have a clean test point.
[listing]
----
@ -159,3 +194,17 @@ Generating into /home/joel/newbsd/git/libbsd-8.2
0 files were changed.
----
== Initialization of RTEMS Libbsd
The initialization of the RTEMS Libbsd is based on the FreeBSD SYSINIT
infrastructure. This is simply because we are initializing a subset of
FreeBSD. For details refer to http://www.freebsd.org/cgi/man.cgi?query=SYSINIT&sektion=9&apropos=0&manpath=FreeBSD+9-current
The key to initializing a system is to ensure that the desired device
drivers are explicitly pulled into the linked application. This plus
linking against the Libsd library will pull in the necessary FreeBSD
infrastructure. The SYSINIT structures are automatically built at link
time and the various initialization routines will thus be executed in'
the correct order.
XXX This needs more details.