I just took a brief look at what is required for programming for the DSP in the 770. It seems that building your own modules is possible with publically awailable tools and documents. At least I got the demo_console from DSP gateway loaded and it seems to run OK.
The following is what I did. Someone might be interested in testing the instructions and maybe polish these into a proper HOWTO to the maemo wiki. 1. Get TI Linux DSP tools from: https://www-a.ti.com/downloads/sds_support/targetcontent/LinuxDspTools/index.html Access to the download requires creating an account. The download page has a link to a "Getting Started" PDF which has instructions for installing. The install instruct start at page 11, chapter 2.3.1. The download package is an ELF-executable but fortunately it just unpacks the main package. The package seems to require java - at least it prints out "Searching for Java(tm) Virtual Machine". For other pre-requirements see chapter 2.1, but note that not all of the listed things are strictly required. Installing pdksh might be a good idea if one does not want to go changing the scripts written for ksh. For easily installing the unpacked subpackages one can use the supplied expect script. Naturally this requires having expect installed. Alternatively one can simply unpack the tarballs one by one. It is probably a good idea to use the same directory names as the ones used in the instructions in order to minimize needed chages to DSP gateway makefiles. The instructions starting from chapter 3 seem to be MontaVista and dsplink specific. If one wants to use the dsp gateway there's no need to follow those. 2. Get dsp gateway from http://dspgateway.sourceforge.net/pub/index.php Get both the arm side package (dspgw-3.3-arm.tar.bz2) and the dsp side package (dspgw-3.3-dsp.tar.bz2). No need to go patching the 770 kernel or rebuilding it. Unpack the tarballs. Go to dspgw-3.3-arm/host_utils/mod_utils and build the coff_unresolve and gen_dummy_kernel tools. Simple make should be sufficient. Either copy these tools to your path or adjust dspgw-3.3-dsp/apps/demo_mod/Makefile to use the tools from the directory where they are. Also build the arm side of the demo console in dspgw-3.3-arm/apps/demo with "make demo_console". You may need to adjust CC to point to your arm cross compiler, e.g. /scratchbox/compilers/arm-gcc-3.3.4-glibc-2.3.2/bin/arm-linux-gcc if you have scratchbox installed. 3. Get the avs_kernel.out from your 770 The dynamically loaded DSP modules are linked against a dummy kernel object generated from the actual kernel. The DSP kernel is in /etc/dsp directory. Just copy it to your host and adjust dspgw-3.3-dsp/apps/demo_mod/Makefile to use the 770 avs_kernel.out to generate the dummy_kernel.obj instead of using the default tinkernel.out. Now you should be able to build the DSP side of the demo console with simple make. 4. Install demo_console In order to make the DSP gateway dynamic loader to load the DSP side of the demo, we need to add a line to the /etc/dsp/dsp_dld_avs.conf file. So e.g. # cp -i /media/mmc1/demo_console.o /etc/dsp/modules # echo "demo_console _task_demo_console 1 /etc/dsp/modules/demo_console.o" \ >> /etc/dsp/dsp_dld_avs.conf I was not able to restart the DSP gateway dynamic loader (there is an init script for dld) so I just rebooted my 770. After boot there should be a /dev/dsptask/demo_console if the dld managed to load the module. Now just run the arm side demo_console. You should see some praise :-) -- http://www.iki.fi/~ananaza/ _______________________________________________ maemo-developers mailing list maemo-developers@maemo.org https://maemo.org/mailman/listinfo/maemo-developers
