imx6 Rex EMC testing Content

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imx6 Rex EMC testing (including the script examples) Here you can find the setup, scripts and results of imx6 Rex EMC testing. Content 1. Hardware configuration 2.

1 imx6 Rex EMC testing (including the script examples) Here you can find the setup, scripts and results of imx6 Rex EMC testing. Content 1. Hardware configuration 2. Test description 3. Test results Radiated emission 4. Test results Conducted emission APPENDIX 5. How to prepare the test outline 6. Standard test 7. Heavy test 1. Hardware configuration

Connected cables/devices Power jack: +12V from an isolated source SD card 1 (the one on the PCB edge): preloaded with Filesystem and used for booting SD card 2 (the one under heatsink): used for

2 Connected cables/devices Power jack: +12V from an isolated source SD card 1 (the one on the PCB edge): preloaded with Filesystem and used for booting SD card 2 (the one under heatsink): used for read/write testing RTC Battery: inserted in the holder Ethernet: Ethernet loopback cable connected. Forced to 100Mb and used for ping test. HDMI monitor: during the test, the monitor is connected but turned off. 2x USB memory stick: each connected through an extension cable. Both used during read/write test. RS232: a null modem cable connected. During the test, the cable was terminated with an RS232 to USB converter. SATA CFAST card (without the metal card holder): used for read/write testing Headphones & Microphone: standard headphones connected to the headphones and microphone jack Audio loopback: a cable connected between Line in and Line out Wifi PCIE mini card: inserted, but not actively used. No antennas connected. Modem: inserted, but not actively used. No antennas connected, no SIM card inserted. back to top

3 2. Test description The goal of this test was to check Radiated and Conducted emission of imx6 Rex board while running at very high load. What was running: CPU stress test Memory stress test GPU stress test (running a Full HD graphics test at rate 150 frames per second) Linux GUI Playing a video file Playing an audio file SD card test (SD card read & write stress test) 2x USB test (USB memory stick read & write stress test) SATA test (CFAST SSD card read & write stress test) Ethernet ping 3. Test Results - Radiated emission *Note: Tested for EN55022B Vertical polarization Running Linux Only back to top

4 Vertical polarization Heavy Testing

5 Horizontal polarization Running Linux Only

6 Horizontal polarization Heavy Testing back to top

7 4. Test Results - Conducted emission *Note: tested with VEP36US12 AC Adaptor Power cable L1 Heavy Testing (page 1)

8 Power cable L1 Heavy Testing (page 2)

9 Power cable N Heavy Testing (page 1)

10 Power cable N Heavy Testing (page 2) back to top

11 Appendix 5. How to prepare the test 1. Download this file system (created based on Jasbirs blog), download this kernel and follow these steps to prepare SD card. 2. Insert the SD card to the edge SD card slot. 3. Update the u-boot to boot up from SD card and set few other parameters: > setenv bootargs_mmc 'setenv bootargs ${bootargs} ip= ::: root=/dev/mmcblk1p1 rootwait vmalloc=400m fbmem=28m fbcon=28m' > setenv bootcmd_mmc 'run bootargs_mmc ; mmc dev 1; ext2load mmc 1 0x imx6rex-uimage-gpu-en-audio-fix-03-apr ; bootm 0x ' > saveenv 4. Run test scripts (they are included in the file system, or you can download them here: Download Standard Test or Download Heavy Test). As script parameters use the directories where the devices are mapped (without /dev/)./name-of-the-test.sh SATA_DIR USB0_DIR USB1_DIR MMC0_DIR Here are examples how to run the scripts (in this example /dev/mmcblk1p1 is a filesystem device): #./emc-test1.sh sda1 sdb1 sdc1 mmcblk0p1 and the heavy test #./emc-test-all.sh sda1 sdb1 sdc1 mmcblk0p1

12 *Note: you may need to check where your devices are mounted. Use fdisk -l. Here is an example: # fdisk -l Disk /dev/sda: 7998 MB, bytes 108 heads, 63 sectors/track, 2296 cylinders, total sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x001c2022 Device Boot Start End Blocks Id System /dev/sda Linux Disk /dev/mmcblk0: 3904 MB, bytes 4 heads, 16 sectors/track, cylinders, total sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xc44e7f69 Device Boot Start End Blocks Id System /dev/mmcblk0p Linux Disk /dev/mmcblk1: 1977 MB, bytes 61 heads, 62 sectors/track, 1021 cylinders, total sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x Device Boot Start End Blocks Id System /dev/mmcblk1p Linux Disk /dev/sdb: 16.2 GB, bytes 256 heads, 48 sectors/track, 2578 cylinders, total sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xc3072e18 Device Boot Start End Blocks Id System /dev/sdb FAT16

13 Disk /dev/sdc: 16.0 GB, bytes 255 heads, 63 sectors/track, 1946 cylinders, total sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x Device Boot Start End Blocks Id System /dev/sdc c W95 FAT32 (LBA) back to top 6. The Standard test script #!/bin/sh mountdevice() { mount /dev/$1 /media/$2 cat /etc/mtab grep -F "/dev/$1 /media/$2" if [ "$?" -eq "0" ]; then echo "$2 mounted" else echo "$2 not mounted"; exit 2 fi } # mount devices a test a status mountdevice $1 sata mountdevice $2 usb0 mountdevice $3 usb1 mountdevice $4 mmc0 # tell the X applications where they should run export DISPLAY=:0 # run X window - wait for the procces service lightdm start # connect ethernet loopback and force the ethernet to 100Mbit mii-tool -F 100baseTx-HD # play a video file in an infinite loop

14 echo 0 > /sys/class/graphics/fb2/blank sudo -u "ubuntu" xfce4-terminal --geometry=70x x mplayer -vo fbdev2:/dev/fb2 -vf scale -zoom -loop 0 -xy 1024 /home/ubuntu/clou$ # ping sudo -u "ubuntu" xfce4-terminal --geometry=70x x ping & # top sudo -u "ubuntu" xfce4-terminal --geometry=90x x top & proceed=1 file1="blackbird.wav" while [ $proceed -eq 1 ] do cp1_done=`ps cax grep $cp1_pid grep cp` if [ -z "$cp1_done" ]; then # run cp only if previous cp is done cp /media/usb0/$file1 /media/sata & cp1_pid=$! echo "started cp from usb0 to sata" fi cp2_done=`ps cax grep $cp2_pid grep cp` if [ -z "$cp2_done" ]; then # run cp only if previous cp is done cp /media/usb1/$file1 /media/mmc0 & cp2_pid=$! echo "started cp from usb1 to mmc0" fi aud_done=`ps cax grep $aud_pid grep aplay` if [ -z "$aud_done" ]; then aplay -D hw:0,0 /home/ubuntu/blackbird.wav & aud_pid=$! echo "started play audio" fi done # kill all procceses if Ctrl+C detected trap '$precced=0; kill $cp1_pid $cp2_pid &aud_pid;' 2 sleep back to top

15 7. The Heavy test script #!/bin/sh mountdevice() { mount /dev/$1 /media/$2 cat /etc/mtab grep -F "/dev/$1 /media/$2" if [ "$?" -eq "0" ]; then echo "$2 mounted" else echo "$2 not mounted"; exit 2 fi } # mount devices a test a status mountdevice $1 sata mountdevice $2 usb0 mountdevice $3 usb1 mountdevice $4 mmc0 # tell the X applications where they should run export DISPLAY=:0 # run X windows - wait for the procces service lightdm start # connect Ethernet loopback and force the ethernet to 100Mbit mii-tool -F 100baseTx-HD # gpu test cd /root/gpu-viv-bin-mx6q hfp/opt/viv_samples/vdk./tutorial7 & gpu_pid=$! cd # play a video file on the lvds display echo 0 > /sys/class/graphics/fb2/blank mplayer -vo fbdev2:/dev/fb2 -vf scale -zoom -loop 0 -xy really-quiet /home/ubuntu/clouds.avi & vid_pid=$! # stressapptest - testing sata, 2x usb, sd card, 1 thread CPU, 1 thread memory stressapptest -f /media/sata/tmp-file1 -f /media/usb0/tmp-file1 -f /media/usb1/tmp-file1 -f /media/mmc0/tmp-file1 -s M 50

16 -m 1 $ str_pid=$! echo "Stressapptest: " $str_pid # play a audio file mplayer -loop 0 -really-quiet /home/ubuntu/blackbird.wav & aud_pid=$! # ping ping & ping_pid=$! # top top top_pid=$! # kill all procceses if Ctrl+C detected trap '$procced=0; kill $gpu_pid $vid_pid $aud_pid $str_pid $ping_pid;' 2 sleep Note: If the LVDS monitor is not included in the setup comment out these lines: #echo 0 > /sys/class/graphics/fb2/blank #mplayer -vo fbdev2:/dev/fb2 -vf scale -zoom -loop 0 -xy really-quiet /home/ubuntu/clouds.avi & Add this line (to disable LVDS): # echo 1 > /sys/class/graphics/fb2/blank back to top

Getting Started with BeagleBoard xm

Getting Started with BeagleBoard xm by Getting Started with BeagleBoard-xM 1. Beagleboard-xM BeagleBoard.org ก Texas Instruments DM3730 1 GHz ก ARM Cortex-A8 (DSP) (PowerVR) (RAM) 512 MB Serial Port, USB