Yocto Platform Customization: Difference between revisions

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Revision as of 13:34, 8 May 2017

Yocto

Documentation

  • Yocto Project Core - Morty 2.2.1 (released on 02/24/2017)

Documentation is available from www.yoctoproject.org

  • FSL Community BSP Release Notes 2.2 documentation

Documentation is available from http://freescale.github.io


VAR-SOM-MX6

Build Results

Device Tree Name
 SOM type
 Carrier Board type
 LCD Type
 Evaluation Kit name
uImage-imx6q-var-som-cap.dtb VAR-SOM-MX6_V2 (Quad / Dual) VAR-MX6CustomBoard Capacitive touch VAR-DVK-MX6_V2-PRO
VAR-STK-MX6_V2
uImage-imx6q-var-som-res.dtb VAR-SOM-MX6_V2 (Quad / Dual) VAR-MX6CustomBoard Resistive touch VAR-DVK-MX6_V2-PRO
VAR-STK-MX6_V2
uImage-imx6q-var-som-vsc.dtb VAR-SOM-MX6_V2 (Quad / Dual) VAR-SOLOCustomBoard Capacitive LVDS touch N/A
uImage-imx6dl-var-som-cap.dtb VAR-SOM-MX6_V2 (DualLite/ Solo) VAR-MX6CustomBoard Capacitive touch N/A
uImage-imx6dl-var-som-res.dtb VAR-SOM-MX6_V2 (DualLite/ Solo) VAR-MX6CustomBoard Resistive touch N/A
uImage-imx6dl-var-som-vsc.dtb VAR-SOM-MX6_V2 (DualLite/ Solo) VAR-SOLOCustomBoard Capacitive LVDS touch N/A
uImage-imx6dl-var-som-solo-vsc.dtb VAR-SOM-SOLO / VAR-SOM-DUAL VAR-SOLOCustomBoard Capacitive LVDS touch VAR-DVK-SOLO/DUAL
VAR-STK-SOLO/DUAL
uImage-imx6dl-var-som-solo-cap.dtb VAR-SOM-SOLO / VAR-SOM-DUAL VAR-MX6CustomBoard Capacitive touch N/A
uImage-imx6dl-var-som-solo-res.dtb VAR-SOM-SOLO / VAR-SOM-DUAL VAR-MX6CustomBoard Resistive touch N/A
uImage-imx6q-var-dart.dtb VAR-SOM-SOLO / VAR-SOM-DUAL VAR-DT6CustomBoard Capacitive LVDS touch VAR-DVK-DT6
VAR-STK-DT6


Device tree

Build the device tree for Dualite/Solo on VAR-MX6CustomBoard with capacitive touchscreen:
$ make -j4 imx6dl-var-som-cap.dtb

Build the device tree for Dualite/Solo on VAR-MX6CustomBoard with resistive touchscreen:
$ make -j4 imx6dl-var-som-res.dtb

Build the device tree for Dualite/Solo on VAR-SOLOCustomBoard:
$ make -j4 imx6dl-var-som-vsc.dtb

Build the device tree for Quad/Dual on VAR-MX6CustomBoard with capacitive touchscreen:
$ make -j4 imx6q-var-som-cap.dtb

Build the device tree for Quad/Dual on VAR-MX6CustomBoard with resistive touchscreen:
$ make -j4 imx6q-var-som-res.dtb

Build the device tree for Quad/Dual on VAR-SOLOCustomBoard:
$ make -j4 imx6q-var-som-vsc.dtb

Build the device tree for VAR-SOM-SOLO on VAR-MX6CustomBoard with capacitive touchscreen:
$ make -j4 imx6dl-var-som-solo-cap.dtb

Build the device tree for VAR-SOM-SOLO on VAR-MX6CustomBoard with resistive touchscreen:
$ make -j4 imx6dl-var-som-solo-res.dtb

Build the device tree for VAR-SOM-SOLO on VAR-SOLOCustomBoard:
$ make -j4 imx6dl-var-som-solo-vsc.dtb

Build the device tree for DART-MX6:
$ make -j4 imx6q-var-dart.dtb


DART-6UL

Build Results

File Name Description
zImage-imx6ul-var-dart-emmc_wifi.dtb Device tree blob for DART-6UL with eMMC & WI-FI enabled. (SD card & NAND disabled)
zImage-imx6ul-var-dart-nand_wifi.dtb Device tree blob for DART-6UL with NAND flash & WI-FI enabled. (SD card & eMMC disabled)
zImage-imx6ul-var-dart-sd_emmc.dtb Device tree blob for DART-6UL with SD card & eMMC enabled (WIFI & NAND disabled)
zImage-imx6ul-var-dart-sd_nand.dtb Device tree blob for DART-6UL with SD card & NAND flash enabled (WIFI & eMMC disabled)
zImage-imx6ull-var-dart-emmc_wifi.dtb Device tree blob for DART-6ULL with eMMC & WI-FI enabled. (SD card & NAND disabled)
zImage-imx6ull-var-dart-nand_wifi.dtb Device tree blob for DART-6ULL with NAND flash & WI-FI enabled. (SD card & eMMC disabled)
zImage-imx6ull-var-dart-sd_emmc.dtb Device tree blob for DART-6ULL with SD card & eMMC enabled (WIFI & NAND disabled)
zImage-imx6ull-var-dart-sd_nand.dtb Device tree blob for DART-6ULL with SD card & NAND flash enabled (WIFI & eMMC disabled)


Device tree

Build only the device tree for DART-6UL with eMMC and WiFi:
$ make -j4 imx6ul-var-dart-emmc_wifi.dtb

Build only the device tree for DART-6UL with eMMC and SD card:
$ make -j4 imx6ul-var-dart-sd_emmc.dtb

Build only the device tree for DART-6UL with NAND flash and WiFi:
$ make -j4 imx6ul-var-dart-nand_wifi.dtb

Build only the device tree for DART-6UL with NAND flash and SD card:
$ make -j4 imx6ul-var-dart-sd_nand.dtb

Build only the device tree for DART-6ULL with eMMC and WiFi:
$ make -j4 imx6ull-var-dart-emmc_wifi.dtb

Build only the device tree for DART-6ULL with eMMC and SD card:
$ make -j4 imx6ull-var-dart-sd_emmc.dtb

Build only the device tree for DART-6ULL with NAND flash and WiFi:
$ make -j4 imx6ull-var-dart-nand_wifi.dtb

Build only the device tree for DART-6ULL with NAND flash and SD card:
$ make -j4 imx6ull-var-dart-sd_nand.dtb


SD card image file tree

/opt/images/
└── Yocto
    ├── imx6ul-var-dart-emmc_wifi.dtb
    ├── imx6ul-var-dart-nand_wifi.dtb
    ├── imx6ul-var-dart-sd_emmc.dtb
    ├── imx6ul-var-dart-sd_nand.dtb
    ├── imx6ull-var-dart-emmc_wifi.dtb
    ├── imx6ull-var-dart-nand_wifi.dtb
    ├── imx6ull-var-dart-sd_emmc.dtb
    ├── imx6ull-var-dart-sd_nand.dtb
    ├── rootfs.tar.bz2
    ├── rootfs.ubi
    ├── SPL-nand
    ├── SPL-sd
    ├── u-boot.img-nand
    ├── u-boot.img-sd
    └── zImage


Boot board with a bootable SD card

Note: Boot from SD card eliminates Wifi as the Wifi and SD card are using same SDIO interface.
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.

Boot switch 6ul1.jpg
  • "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:
On-SOM storage: SD only, eMMC, NAND.
WIFI if chip exits.
For example: 

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

As explained in the above Build Results table we have 4 optional configurations.
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.

SOM Type
 Boot From
 SOM Internal FLASH
 SOM has WIFI/BT
 Device Tree selected
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

Note: Boot from SD card eliminates Wifi as the Wifi and SD card are using same SDIO interface.
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: 

$ setenv var_auto_fdt_file=N
$ saveenv

Now you can set the device tree to meet your requirements. For example: 

$ setenv fdt_file=imx6ul-var-dart-sd_emmc.dtb
$ saveenv

Will select device tree that has SD and eMMC regardless if the SOM has WIFI. 

$ setenv fdt_file=imx6ul-var-dart-sd_nand.dtb
$ saveenv

Will select device tree that has SD and NAND regardless if the SOM has WIFI.

Comment:
Make sure you don't set am illegal value like "imx6ul-var-dart-sd_nand.dtb" in a SOM that has eMMC flash.


Platform Customizations



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This page was last edited on 8 May 2017, at 13:34.

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