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Using the DSP on Gumstix with Yocto

Lots of discussion on the mailing list lately on how to get the DSP working using the new yocto build system. This works for me…

Start with the standard instructions and make sure you can build gumstix-console-image.

I’m using 64-bit (AMD64) Ubuntu 12.04 LTS, so I needed to also install ia32-libs for the TI installer. You may not need this, depending on your build host.

sudo apt-get install ia32-libs

Now, add the meta-ti layer:

cd ~/yocto/poky
git clone git://git.yoctoproject.org/meta-ti
cd meta-ti
git checkout denzil

Then edit ~/yocto/build/conf/bblayers.conf to add the meta-ti layer so that it looks something like this:

BBLAYERS ?= " \
  /home/chris/yocto/poky/meta \
  /home/chris/yocto/poky/meta-yocto \
  /home/chris/yocto/poky/meta-openembedded/meta-gnome \
  /home/chris/yocto/poky/meta-openembedded/meta-oe \
  /home/chris/yocto/poky/meta-openembedded/meta-xfce \
  /home/chris/yocto/poky/meta-gumstix \
  /home/chris/yocto/poky/meta-ti \
  "

Edit ~/yocto/build/conf/local.conf and add the following line to ignore some of the meta-ti recipes:

BBMASK ?= ".*/meta-ti/recipes-(misc|bsp/formfactor)/"

Fix up the toolchain_path env variable by editing ~/yocto/poky/meta-gumstix/conf/machine/overo.inc and adding the line below. This fixes the problem finding the compiler when building dsplink.

TOOLCHAIN_PATH ?= "${STAGING_DIR_NATIVE}${prefix_native}/bin/${TUNE_PKGARCH}${HOST_VENDOR}-${HOST_OS}"
TOOLCHAIN_SYSPATH ?= "${TOOLCHAIN_PATH}/${TARGET_SYS}"

Then edit ~/yocto/poky/meta-gumstix/conf/machine/include/omap3.inc and just before the tune-cortexa8.inc line, add the line below. This fixes the problem building the DMAI recipe.

require conf/machine/include/soc-family.inc

Now, download ti_cgt_c6000_7.2.7_setup_linux_x86.bin from TI and place in your ~/yocto/build/downloads directory. Touch ti_cgt_c6000_7.2.7_setup_linux_x86.bin.done in the same directory.

Ok! You should now be able to “bitbake gstreamer-ti”. It will take a bit of time.

If this works, you can build an image that has gstreamer-ti along with other gstreamer-plugins. Here is one such image recipe: gumstix-dsp-image.bb

Once the image is built, create your sd card. When booting for the first time, stop the u-boot countdown and change the env vars to leave a memory hole for cmemk.

setenv mem 'mem=96M@0x80000000 mem=384M@0x88000000'
setenv mpurate 800
setenv mmcargs 'setenv bootargs console=${console} mpurate=${mpurate} vram=${vram} omapfb.mode=dvi:${dvimode} omapfb.debug=y omapfb.vram=${fbvram} omapdss.def_disp=${defaultdisplay} ${mem} root=${mmcroot} rootfstype=${mmcrootfstype}'
saveenv
reset

Go ahead and boot into linux, then edit /lib/systemd/system/gstti-init.service and remove the line which starts “ConditionKernelCommandLine=”. This condition causes the modules to only get loaded if the memory hole is very specific.

Now reboot one more time.

Once booted, check your modules and make sure cmemk loaded for you:

root@overo:~# lsmod                                                             
Module                  Size  Used by                                           
mt9v032                 7237  4294967295                                        
omap3_isp             131955  0                                                 
v4l2_common             8933  2 mt9v032,omap3_isp                               
videodev               99128  3 mt9v032,omap3_isp,v4l2_common                   
media                  12714  3 mt9v032,omap3_isp,videodev                      
ads7846                10488  0                                                 
sdmak                   4076  0                                                 
lpm_omap3530            6797  0                                                 
dsplinkk              131408  1 lpm_omap3530                                    
cmemk                  22005  0                                                 
rfcomm                 56119  0                                                 
hidp                   16251  0                                                 
bluetooth             258745  4 rfcomm,hidp                                     
rfkill                 17524  1 bluetooth                                       
ipv6                  249350  16      

Test out the dsp with a simple pipeline:

gst-launch videotestsrc num-buffers=5 ! TIVidenc1 codecName=mpeg4enc engineName=codecServer ! fakesink

Good luck.

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