In order to use the DSP you would need TI's bridgedriver module on the kernel. For that you would need Hiroshi's patches on top of linux-omap:
git clone http://www.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap-2.6.git cd linux-omap-2.6 wget http://4869037.web.fc2.com/tidspbridge-20081021.tgz tar xvzf tidspbridge-20081021.tgz git am *.patch make omap3_beagle_defconfig
make menuconfig and add the following options in the menuconfig:
CONFIG_FB_OMAP_CONSISTENT_DMA_SIZE=14 #in Device Drivers->Graphics support->Support for frame buffer devices->Consistent DMA memory size CONFIG_MPU_BRIDGE=m #in Device Drivers->DSP Bridge driver
In order to get the DSP binaries for multimedia processing you need to download TI's OpenMAX IL package. Once you have extracted the tarball you'll have to run the installer TI-OMX-Sample-Firmware-0.3-Linux-x86-Install and accept the license agreement.
You would end up with a bunch of binaries in
lib/dsp, copy them to your root filesystem at the same location (/lib/dsp).
If you want to test the DSP you can try the simple ping test provided in this package.
If you get an error like:
DSPNode_Allocate failed: 0x80008008
Then it's possible that the ping DSP socket node is not loaded. If you use 'baseimage.dof' you need to load it dynamically:
./dynreg.out -r pingdyn_3430.dll64P
On the other hand, 'ddspbase_tiomap3430.dof64P' has the node statically included, so there's no need to do that.
On the board use this to load the module:
modprobe bridgedriver base_img=/lib/dsp/baseimage.dof
In order to develop dynamic dsp nodes you'll need a C6x compiler and doffbuild tools.
Apparently the only version that works is v6.0.16.
The only relevant tool is DLLcreate, which can be found in TI's omapzoom site, on the dspbridge_dsp package.
mkdir -p tmp tar -xf dspbridge_dsp.tar.gz -C tmp mv tmp/dsp/bdsptools/packages/ti/dspbridge/dsp/doffbuild /opt/doffbuild rm -rf tmp
This library is used by the user-space applications.
git clone git://github.com/felipec/libdspbridge.git cd libdspbridge make DESTDIR=$rootfs install
Example dsp node
Here is an example dsp node that is simply passing buffers back and forth.
git clone git://github.com/felipec/dsp-dummy.git make DSP_TOOLS=/opt/dsptools DSP_DOFFBUILD=/opt/doffbuild BRIDGE_DIR=../libdspbridge
As a result you'll have two binaries; dummy.dll64P for dsp-side, and dummy for arm-side.
To load the dynamic node:
/dspbridge/dynreg.out -r /lib/dsp/dummy.dll64P
Now you can run the dummy test application.