Reference Designs with Yocto - Intel devices

Some of the reference designs from Trenz Electronics include a preconfigured yocto bsp layer that can be used to generate a Linux image and a prebuilt yocto linux image, that can be copied directly to sd card.

Generate image with predefined yocto BSP layer

The yocto bsp layer will be generated with the quartus project in the <project name>/os/yocto/meta-<module> folder. The generated layers depends on the meta-altera layer (for more information see: Yocto KICKstart#Used source files).

1. Download a reference design that includes yocto bsp layer
2. Generate the quartus project as described in the wiki description of the downloaded reference design or in Project Delivery - Intel devices#Quick Start
3. Copy the generated meta-<module> folder from <project name>/os/yocto/meta-<module> to the path/to/yocto/poky/ directory
4. Follow the steps from Yocto KICKstart#Create a project for an Intel FPGA device without running the 'bitbake' command

5. Add the generated bsp layer meta-<machine> to /yocto/poky/build/conf/bblayers.conf with:

   bitbake-layers add-layer ../meta-<module>

6. Redefine the variable MACHINE with '<module>-<Board-Part-Short-Name>' in path/to//yocto/poky/build/conf/local.conf 
   1. A list with the correct MACHINE names can be found in the wiki description of the reference design: Overview→Requirements→Hardware

      • e.g. for the board TEI0022-03 see TEI0022 Test Board#Hardware → the MACHINE name is tei0022-a5-c8-2gb.

   2. run following commands to redefine 'MACHINE':

      sed -i '/^MACHINE/s/MACHINE/#MACHINE/g' conf/local.conf
      echo -e '\nMACHINE = "<module>-<Board-Part-Short-Name>"' >> conf/local.conf

7. Build the image with following command (the image recipes are located in meta-<module>/recipes-images/yocto/):

   bitbake <module>-image-minimal

Copy image to SD card

Yocto generates a full sd card image with u-boot, zImage, rootfs etc. included.

The generated image is stored in path/to/yocto/poky/build/tmp/deploy/images/<machine>/<image_name>.wic.

If you downloaded a reference design with prebuilt files, you can find a generated yocto linux image in <project name>/prebuilt/Board_Part_Short_Name/os/yocto/images/.

Do following steps to copy the image to the SD card:

1. Insert the sd card into a sd card reader connected to the computer

2. Run following command to get the device name of the SD card  (e.g. /dev/sdx):

   lsblk

3. Copy the generated *.wic image to the sd card (replace 'sdx' in 'of=/dev/sdx' with the correct sd card device name:

   sudo dd if=path/to/yocto_image/<image_name>.wic of=/dev/sdx bs=1M seek=0

4. Insert the SD card into your board, set boot mode to sd card (if the setting is available) and boot it.

Serial Console

1. Open Serial Console (e.g. PuTTY)

   1. select COM Port

      Win OS: see device manager

      Linux OS: see  dmesg | grep tty  (UART is *USB1)

   2. Speed: 115200
2. Press reset button on the board
3. Linux Console:

   1. Login data:

      Note: Wait until Linux boot finished

      Username: root
      Password: root

   2. You can use Linux shell now.

      i2cdetect -y -r 1   (check I2C 1 Bus, if available)
      dmesg | grep rtc    (RTC check, if available)
      udhcpc              (ETH0 check, if available)
      lsusb               (USB check, if available)