View source for DART-6UL Yocto Morty Build Yocto release

{{PageHeader|DART-6UL - Yocto Morty 2.2.1 based on FSL Community BSP 2.2 with L4.1.15_2.0.0-ga Linux release}} {{DocImage|category1=DART-6UL|category2=Yocto}} __toc__

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= Setup and build Yocto =
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== Build X11 GUI demo image ==
<pre>
$ cd ~/var-fslc-yocto
$ MACHINE=mx6ul-var-dart DISTRO=fslc-x11 . setup-environment build_x11
</pre>

Optional steps: [[#local.conf customization|local.conf customization]]

launch bitbake:
<pre>
Without Qt content:
$ bitbake fsl-image-gui

Or with Qt content:
$ bitbake fsl-image-qt5
</pre>

NOTE: Some of the [https://github.com/Freescale/gstreamer-imx/blob/master/docs/blitter-architecture.md blitter-based I.MX GStreamer plugins] do not work with X11 and Wayland backends. To get the most of the I.MX GPU/VPU acceleration use the fslc-framebuffer backend

== Build console-only demo image with Freescale’s multimedia packages (VPU and GPU) ==
<pre>
$ cd ~/var-fslc-yocto
$ MACHINE=mx6ul-var-dart DISTRO=fslc-framebuffer . setup-environment build_fb
</pre>

Optional steps: [[#local.conf customization|local.conf customization]]

<pre>
Without Qt content:
$ bitbake fsl-image-gui

Or with Qt content:
$ bitbake fsl-image-qt5
</pre>

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== Build Results ==
The resulted images are located at tmp/deploy/images/imx6ul-var-dart:

{| class="wikitable"
|-
! scope="col" | File Name
! scope="col" | Description
|-
| style="padding: 5px;"| fsl-image-gui-imx6ul-var-dart.sdcard
| style="padding: 5px;"| This image is for SD card boot.<br> It can be flashed as-is on an SD card that can then be used to boot your system.<br>For detailed information refer to the [[#Create_a_bootable_SD_card|Create a bootable SD card]] section below.
|-
| style="padding: 5px;"| fsl-image-gui-imx6ul-var-dart.tar.bz2
| style="padding: 5px;"| Tarball with rootfs files.<br>Can be used to create an NFS root file system on the host.<br> See the [[VAR-SOM-MX6_Yocto_Utilizing | Setup TFTP/NFS Yocto system]] section for more info.<br>Also used to create our extended SD card.<br>See the [[#Create_a_bootable_SD_card|Create a bootable SD card]] section below.
|-
| style="padding: 5px;"| fsl-image-gui-imx6ul-var-dart.ubi
| style="padding: 5px;"| A complete UBI image containing a UBIFS volume, for writing to NAND flash.
|-
| style="padding: 5px;"| zImage
| style="padding: 5px;"| Linux kernel image, same binary for SD card/eMMC/NAND flash.
|-
| style="padding: 5px;"| SPL-nand
| style="padding: 5px;"| SPL built for NAND flash. The SPL is a pre-U-Boot SW component, used for DDR initialization
|-
| style="padding: 5px;"| SPL-sd
| style="padding: 5px;"| SPL built for SD card boot. The SPL is pre-U-Boot SW component, used for DDR initialization
|-
| style="padding: 5px;"| u-boot.img-sd
| style="padding: 5px;"| U-Boot built for SD card/eMMC.
|-
| style="padding: 5px;"| u-boot.img-nand
| style="padding: 5px;"| U-Boot built for NAND flash.
|-
| style="padding: 5px;"| zImage-imx6ul-var-dart-emmc_wifi.dtb
| style="padding: 5px;"| Device tree blob for DART-6UL with eMMC & WI-FI enabled. (SD card & NAND disabled)
|-
| style="padding: 5px;"| zImage-imx6ul-var-dart-nand_wifi.dtb
| style="padding: 5px;"| Device tree blob for DART-6UL with NAND flash & WI-FI enabled. (SD card & eMMC disabled)
|-
| style="padding: 5px;"| zImage-imx6ul-var-dart-sd_emmc.dtb
| style="padding: 5px;"| Device tree blob for DART-6UL with SD card & eMMC enabled (WIFI & NAND disabled)
|-
| style="padding: 5px;"| zImage-imx6ul-var-dart-sd_nand.dtb
| style="padding: 5px;"| Device tree blob for DART-6UL with SD card & NAND flash enabled (WIFI & eMMC disabled)
|-
| style="padding: 5px;"| zImage-imx6ull-var-dart-emmc_wifi.dtb
| style="padding: 5px;"| Device tree blob for DART-6ULL with eMMC & WI-FI enabled. (SD card & NAND disabled)
|-
| style="padding: 5px;"| zImage-imx6ull-var-dart-nand_wifi.dtb
| style="padding: 5px;"| Device tree blob for DART-6ULL with NAND flash & WI-FI enabled. (SD card & eMMC disabled)
|-
| style="padding: 5px;"| zImage-imx6ull-var-dart-sd_emmc.dtb
| style="padding: 5px;"| Device tree blob for DART-6ULL with SD card & eMMC enabled (WIFI & NAND disabled)
|-
| style="padding: 5px;"| zImage-imx6ull-var-dart-sd_nand.dtb
| style="padding: 5px;"| Device tree blob for DART-6ULL with SD card & NAND flash enabled (WIFI & eMMC disabled)
|-
|}

= Create a bootable SD card =
== SD card structure ==
The first unallocated 4MiB are saved for U-Boot. It can be replaced using the dd command as described in the [[DART-6UL_Yocto_Krogoth_Build_U-Boot_out_of_tree|Build U-Boot from source code] section.<br>
The first partition is formatted with FAT16 and contains the Linux image and device tree blobs. You can copy them as described in the [[DART-6UL_Yocto_Krogoth_R2_Build_Linux_out_of_tree|Build the Linux kernel from source code]] section.<br>
The second partition is formatted with ext4 and contains the file system (including the kernel modules).

== Yocto pre-built bootable SD card ==
The Yocto build products contains many files as explained in [[#Build Results|Build Results]] section above including a ".sdcard" file. For example, fsl-image-gui-imx6ul-var-dart.sdcard, depending on your build.<br>
This is a complete image to be flashed directly to an SD card.<br>
Example usage:
<pre>
$ cd ~/var-fslc-yocto/build_x11
$ sudo umount /dev/sdX*
$ sudo dd if=tmp/deploy/images/imx6ul-var-dart/fsl-image-gui-imx6ul-var-dart.sdcard of=/dev/sdX bs=1M && sync
Replace sdX with the right device name.
</pre>
Drawbacks of the native .sdcard yocto-built image:
* The second partition size doesn't use the entire SD card.
* The second partition is not labeled as rootfs.
* The NAND and eMMC flashing scripts are not included.

== Create an extended SD card ==
Variscite provides the var-create-yocto-sdcard.sh script which creates our NAND/eMMC recovery SD card - an SD card based on the fsl-image-gui filesystem, which copies the NAND flash burning scripts and relevant binaries for your convenience.<br>
Later, you will be able to follow either the more automatic [[DART-6UL Yocto R2 NAND Recovery|DART-6UL Yocto Recovery SD card]] guide or the more manual [[DART-6ULL NAND Flash Burning|Flashing the internal storage device]] guide to burn your images to NAND flash or eMMC.<br><br>

Note:<br>
This is essentially the same as our pre-built Recovery SD image, with the following main difference:<br>
The pre-built image's rootfs partition size is 3700MiB, which is also the default size when using the script, but the script also has an option to set the rootfs partition size to fill the whole free space of the used SD card. Anyway, you can always resize the partition later with an external tool such as gparted.<br>
Naturally, the pre-built image is more straight forward and easier to use, while the script method is easier to customize.<br><br>

Usage:<br>
* Follow the [[#Setup and build Yocto|Setup and build Yocto]] guide, and bitbake fsl-image-gui.
* Plug-in the SD card to your Linux HOST PC, run dmesg and see which device is added (i.e. /dev/sdX or /dev/mmcblkX)
<pre>
$ sudo MACHINE=imx6ul-var-dart ~/var-fslc-yocto/sources/meta-variscite-fslc/scripts/var_mk_yocto_sdcard/var-create-yocto-sdcard.sh <options> /dev/sdX
(Replace /dev/sdX with your actual device)
</pre>
<pre>
options:
  -h            Display help message
  -s            Only show partition sizes to be written, without actually write them
  -a            Automatically set the rootfs partition size to fill the SD card
  -r            Select alternative rootfs for recovery images (default: build_x11/tmp/deploy/images/imx6ul-var-dart/fsl-image-gui-imx6ul-var-dart.*)

If you don't use the '-a' option, a default rootfs size of 3700MiB will be used.
The '-r' option allows you to create a bootable SD card with an alternative image for the installation to NAND flash or eMMC.
Example: "-r tmp/deploy/images/imx6ul-var-dart/fsl-image-qt5-imx6ul-var-dart" -- selects the "Qt5 image with X11" recovery image
</pre>

= Boot board with a bootable SD card =
<span style="color:red">Note: Boot from SD card eliminates Wifi</span> as the Wifi and SD card are using same SDIO interface.<br>
A typical use-case, is to boot from SD card, flash eMMC or NAND flash, and re-boot form eMMC/NAND to have Wi-Fi operational.

== Setting the Boot DIP switches ==
Booting your system from an SD card requires switching the Boot DIP switches. See picture below.
[[File:Boot_switch_6ul1.jpg|thumb|none|upright=2.0]]
* "00" The current position in the picture will set the system to boot from SD card.
* "01" Moving the right switch will set the system to boot from eMMC
* "10" Moving the left switch will set the system to boot from NAND flash
* "11" is illegal.
Be aware that your system has eMMC or NAND but never both.

== Automatic device Tree selection in U-Boot ==
Upon reset you will see the U-Boot SPL printouts. It will print also the SOM configuration:
<br>On-SOM storage: SD only, eMMC, NAND.
<br>WIFI if chip exits.
<br>For example:
<pre>
U-Boot SPL 2015.10-00532-g482dc88 (Jan 03 2016 - 10:05:42)
i.MX6UL SOC 
Part number: DART-6U-A01
Assembly: AS11
Date of production: 2015 Dec 31
DART-6UL configuration: eMMC WIFI
Ram size: 512
Boot Device: SD
</pre>
As explained in the above [[#Build_Results | Build Results]] table we have 4 optional configurations.
<br>We implemented in U-Boot and automatic device tree selection, so when kernel boots, the U-Boot will load the corresponding device tree according to On-SOM configuration. 

{| class="wikitable"
|-
! scope="col" | SOM Type<br/>
! scope="col" | Boot From<br/>
! scope="col" | SOM Internal FLASH<br/>
! scope="col" | SOM has WIFI/BT<br/>
! scope="col" | Device Tree selected<br/>
|-
| DART-6UL
| SD
| eMMC
| Don't Care
| imx6ul-var-dart-sd_emmc.dtb
|-
| DART-6UL
| SD
| NAND
| Don't Care
| imx6ul-var-dart-sd_nand.dtb
|-
| DART-6UL
| eMMC
| eMMC
| Yes
| imx6ul-var-dart-emmc_wifi.dtb
|-
| DART-6UL
| eMMC
| eMMC
| NO
| imx6ul-var-dart-sd_emmc.dtb
|-
| DART-6UL
| NAND
| NAND
| YES
| imx6ul-var-dart-nand_wifi.dtb
|-
| DART-6UL
| NAND
| NAND
| NO
| imx6ul-var-dart-sd_nand.dtb
|-
| DART-6ULL
| SD
| eMMC
| Don't Care
| imx6ull-var-dart-sd_emmc.dtb
|-
| DART-6ULL
| SD
| NAND
| Don't Care
| imx6ull-var-dart-sd_nand.dtb
|-
| DART-6ULL
| eMMC
| eMMC
| Yes
| imx6ull-var-dart-emmc_wifi.dtb
|-
| DART-6ULL
| eMMC
| eMMC
| NO
| imx6ull-var-dart-sd_emmc.dtb
|-
| DART-6ULL
| NAND
| NAND
| YES
| imx6ull-var-dart-nand_wifi.dtb
|-
| DART-6ULL
| NAND
| NAND
| NO
| imx6ull-var-dart-sd_nand.dtb
|}

<span style="color:red">Note: Boot from SD card eliminates Wifi</span> as the Wifi and SD card are using same SDIO interface.<br>
A typical use-case, is to boot from SD card, flash eMMC or NAND flash, and re-boot form eMMC/NAND to have Wi-Fi operational.

== Disable Automatic Device Tree selection ==
To disable the automatic device tree selection in U-Boot:
<pre>
$ setenv var_auto_fdt_file=N
$ saveenv
</pre>
Now you can set the device tree to meet your requirements. For example:
<pre>
$ setenv fdt_file=imx6ul-var-dart-sd_emmc.dtb
$ saveenv
</pre>
Will select device tree that has SD and eMMC regardless if the SOM has WIFI.
<pre>
$ setenv fdt_file=imx6ul-var-dart-sd_nand.dtb
$ saveenv
</pre>
Will select device tree that has SD and NAND regardless if the SOM has WIFI.
{{note|Comment:<br/>Make sure you don't set am illegal value like "imx6ul-var-dart-sd_nand.dtb" in a SOM that has eMMC flash.|info}}

= Flash images to NAND/eMMC =

Please refer to [[DART-6ULL_NAND_Flash_Burning|DART-6UL NAND Flash Burning]]

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== Running Application ==
<pre>
$ cd /usr/share/qt5/examples/
$ touch/dials/dials --platform linuxfb
$ gui/rasterwindow/rasterwindow --platform linuxfb
$ touch/fingerpaint/fingerpaint  --platform linuxfb
$ widgets/mainwindows/mainwindow/mainwindow --platform linuxfb
</pre>

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