Working with the DM368 DVSDK

These are the files I used, with their md5sums:

3392125b749eed6f794dcd0ee2e1afe2  TMS320DM368_EVM_Quick_Start_Guide.pdf
dc59348a3d961d1afe3ebc94863ba382  TMS320DM368_Software_Developers_Guide.pdf
7609667a522edf8e01c0e197f9cceffa  dvsdk_dm368-evm_4_02_00_06_setuplinux.bin
557231ce93ae8e98e214424cb02f8761  ubuntu-10.04.4-desktop-i386.iso
c8833da1cde15cb77e76635139256fb2  arm-2009q1-203-arm-none-linux-gnueabi.bin

Finally got the laptop set up to build the stupid DVSDK. Here is the process. First install the 32-bit (NOT the 64-bit version) of Ubuntu 10.04. Do not get any software updates:

$ sudo su -
# apt-get update
# apt-get install openjdk-6-jdk fakeroot git-core gitk
# cd /bin
# rm sh
# ln -s bash sh
# exit
$ cd ~

Next install the cross-compile toolchain and the DVSDK:

$ cp ....../arm-2009q1-203-arm-none-linux-gnueabi.bin .
$ cp ....../dvsdk_dm368-evm_4_02_00_06_setuplinux.bin .
$ chmod +x *.bin
$ ./arm-2009q1-203-arm-none-linux-gnueabi.bin
$ ./dvsdk_dm368-evm_4_02_00_06_setuplinux.bin
Accept all defaults.
$ rm *.bin

Finally set up the environment:

$ export DVSDK=${HOME}/ti-dvsdk_dm368-evm_4_02_00_06
$ echo "export DVSDK=${HOME}/ti-dvsdk_dm368-evm_4_02_00_06" >> ~/.bashrc

And build the code and write the SD card:

$ cd ${DVSDK}
$ ./setup.sh
Accept all defaults except the last one, do not go into minicom. That question
asks "Would you like to run the setup script now (y/n)?"
$ make clean components
$ sudo ${DVSDK}/bin/mksdboot.sh --device /dev/sdX --sdk ${DVSDK}

where /dev/sdX is the SD card. You should be able to use the SD card now to boot the board, and any changes like the helloworld.c example should theoretically work.

Finding the Video Rosetta Stone

Look at dvsdk-demos_4_02_00_01/dm365/encode/capture.c, line 369, where frames are captured. Then look at line 353 where the CapBuf_blackFill function is called, and around line 76 where it's defined. Note the use of the yPtr variable in this function. Notice that this function knows how to handle different kinds of video buffers with different encoding schemes. I believe THIS is the Rosetta stone that is going to unlock the magic of video XY coordinates and video bit stuffing. BTW, "CapBuf" means "capture buffer".

Mounting the DVSDK disk at bootup

Cultural Learnings of http://www.tldp.org/HOWTO/HighQuality-Apps-HOWTO/boot.html for Make Benefit Glorious Nation of DVSDK disk automounter. I wrote this file as /etc/init.d/mountdvsdk, and then created a link to it at /etc/rc2.d/S32mountdvsdk. The only magic there is that "32" is shortly after "30", where the vboxsf system is enabled for runlevel 2.

#!/bin/sh

start() {
       echo "Mounting DVSDK at /opt/DVSDK"
       (cd /opt; mount -t vboxsf DVSDK DVSDK)
       RETVAL=$?
}

stop() {
       echo "Unmounting DVSDK"
       (cd /opt; umount DVSDK)
       RETVAL=$?
}

RETVAL=0
case "$1" in
       start)
               start
               ;;
       stop)
               stop
               ;;
       restart)
               stop
               start
               ;;
       *)
               echo Usage: $0 {start|stop}
               RETVAL=1
               ;;
esac
exit $RETVAL

Making a custom SD card

So I did all that and made an SD card and it booted. But it used a standard disk image, and I need to figure out how I'm going to add something to that disk image. That is the purpose of the hackrootfs.sh script, which populates /home/root with a shell script and a compiled C program. Both work fine. You need to telnet into the EVM over the local subnet and login as root.

Soorma07 / dm368

Working with the DM368 DVSDK

Finding the Video Rosetta Stone

Mounting the DVSDK disk at bootup

Making a custom SD card

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