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-20081010.tgz tar xvzf tidspbridge-20081010.tgz git am *.patch make omap3_beagle_defconfig
make menuconfig and add the following options in the menuconfig:
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.
On the board use this to load the module:
modprobe bridgedriver base_img=/lib/dsp/baseimage.dof