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@@ -0,0 +1,144 @@ +Pre-requisites +============== + +ARM toolchain +------------- + +The ARM development toolchain is based on the CodeSourcery version of GCC. This +document is based on the hard floating point 2009q3 1.0.18-4 release from the +scratchbox project, available from + +http://scratchbox.org/download/files/sbox-releases/hathor/tarball/scratchbox-toolchain-cs2009q3-eglibc2.10-armv7-hard-1.0.18-4-i386.tar.gz + +Other versions should work as well. + +Hard floating point is not a requirement but provides better floating point +performances. Mixing soft floating point and hard floating point applications +and libraries is *not* supported. Compiling the whole system with the same +compiler is thus highly advisable. + +To install the toolchain, extract the tarball (this document assumes that the +tarball will be extracted to /opt, but any location can be used) and add the +compiler bin directory to the PATH environment variable. This can be automated +by adding + +export PATH=/opt/scratchbox/compilers/cs2009q3-eglibc2.10-armv7-hard/bin:$PATH + +to ~/.bashrc (when using the bash shell). + +DSP toolchain +------------- + +Compiling applications for the C64 DSP embedded in the OMAP3 processor requires +two development tools, both proprietary and available from Texas Instrument. + +Those tools are made to be invoked from the command line, either directly, +through a script/makefile or from an integrated development environment (IDE). +TI provides an Eclipse-based IDE called Code Composer Studio (CCS). CCS is not +free of charge (although a 30-days evaluation version is available), so this +project will use the command line tools directly. + +Switching to CCS at a later time will be possible if required, as CCS is based +on the same command line tools. + +* Code Generation Tools + +The TI Code Generation Tools (CGT) include a C/C++ compiler, an assembly +compiler and a linker. A version for the OMAP3 DSP is available from + +https://www-a.ti.com/downloads/sds_support/TICodegenerationTools/download.htm + +This documentation is based on version 7.0.3. Later versions, especially minor +releases, should work as well. + +Download the installer from the above URL and install the tools in +/opt/ti/cgt6x-7.0.3. + +* doffbuild + +The doffbuild tools are used to create a relocatable DSP dll64P object. +They can be found in the git repository located at + +git://gitorious.org/ti-dspbridge/userspace.git + +Clone the repository with + +git clone git://gitorious.org/ti-dspbridge/userspace.git + +and copy the DLLcreate utility to /opt/ti/doffbuild/bin/ + +mkdir -p /opt/ti/doffbuild/bin +cp source/dsp/bdsptools/packages/ti/dspbridge/dsp/doffbuild/bin/DLLcreate /opt/ti/doffbuild/bin/ + +* baseimage.dof + +baseimage.dof is the TI DSP operating system (DSP/BIOS) image to be loaded in +the DSP. TI released several versions with no clear versioning scheme. While +DSP/BIOS itself is maintained, the location of the most recent baseimage.dof +version is unclear. + +A working baseimage.dof version can be found in the TI DSP Binaries v3.09, +available at. + +https://gforge.ti.com/gf/download/frsrelease/285/3260/DSPbinaries-3.09-Linux-x86-Install + +After downloading and running the installer, copy the baseimage.dof file from +the Binaries directory to the /lib/dsp directory on the target system. + +Kernel headers +-------------- + +Recent kernel headers (>= 2.6.39) are required to compile both the application +and its dependencies. The headers can be installed locally in the kernel tree +usr/ subdirectory by running + +make headers_install + +The remainder of this document assumes that kernel headers have been installed +in the kernel tree usr/ subdirectory. + +Media Controller library +------------------------ + +The sample application requires the libmediactl and libv4l2subdev libraries. +They can be found in a git repository at + +http://git.ideasonboard.org/?p=media-ctl.git;a=summary + +To configure the library, run + +./configure CC=arm-none-linux-gnueabi-gcc --host=arm-none-linux-gnueabi \ + --with-kernel-headers=/path/to/kernel/usr \ + --prefix=/path/to/libmediactl/installation + +Compile and install the library and its headers with + +make +make install + + +Compilation +=========== + +The DSP Makefile relies on environment variables to locate the TI Code +Generation Tools and doffbuild tools. The following two lines will set the +required environment variables and can be added to ~/.bashrc. + +export DSP_CGT=/opt/ti/cgt6x-7.0.3 +export DSP_DOFFBUILD=/opt/ti/doffbuild + +To compile the DSP and ARM software, run + +make KDIR=/path/to/kernel/usr \ + MEDIACTL_DIR=/path/to/libmediactl/installation \ + CROSS_COMPILE=arm-none-linux-gnueabi- + +This will create two executables, dsp/threshold.dll64P for the DSP and +isp-dsp for the ARM. + + +Installation +============ + +Copy the threshold.dll64P DSP executable to the /lib/dsp/ directory on the +target system. The isp-dsp ARM executable can be run from any directory. |