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- ****************************
- Technexion i.MX7D Pico board
- ****************************
- This file documents the Buildroot support for the Technexion i.MX7D Pico board.
- Build
- =====
- First, configure Buildroot for the i.MX7D Pico board:
- make imx7dpico_defconfig
- Build all components:
- make
- You will find in output/images/ the following files:
- - imx7d-pico.dtb
- - rootfs.ext4
- - rootfs.tar
- - sdcard.img
- - u-boot-dtb.img
- - SPL
- - zImage
- Flash U-Boot and SPL
- =====
- Note: This method is convenient for development purposes.
- If the eMMC has already a U-Boot flashed with DFU support then
- the user can go to step 2 below in order to update U-Boot.
- Put pico board in USB download mode (refer to the PICO-iMX7D Quick Start Guide
- page 3)
- Connect a USB to serial adapter between the host PC and pico.
- Connect a USB cable between the OTG pico port and the host PC.
- Note: Some computers may be a bit strict with USB current draw and will
- shut down their ports if the draw is too high. The solution for that is
- to use an externally powered USB hub between the board and the host computer.
- Open a terminal program such as minicom.
- Copy SPL and u-boot-dtb.img to the imx_usb_loader folder.
- Load the SPL binary via USB:
- $ sudo ./imx_usb SPL
- Load the u-boot-dtb.img binary via USB:
- $ sudo ./imx_usb u-boot-dtb.img
- Then U-Boot starts and its messages appear in the console program.
- Use the default environment variables:
- => env default -f -a
- => saveenv
- Run the DFU agent so we can flash the new images using dfu-util tool:
- => dfu 0 mmc 0
- Flash SPL and u-boot-dtb.img into the eMMC running the following commands on a PC:
- $ sudo dfu-util -D SPL -a spl
- $ sudo dfu-util -D u-boot-dtb.img -a u-boot
- Remove power from the pico board.
- Put pico board into normal boot mode.
- Power up the board and the new updated U-Boot should boot from eMMC.
- Flash the eMMC
- ==============
- In the U-Boot prompt lauch:
- => ums 0 mmc 0
- This will mount the eMMC content in the host PC as a mass storage device.
- To determine the device associated to the eMMC card have a look in the
- /proc/partitions file:
- cat /proc/partitions
- Buildroot prepares a bootable "sdcard.img" image in the output/images/
- directory, ready to be dumped on the eMMC card. Launch the following
- command as root:
- dd if=output/images/sdcard.img of=/dev/<your-sd-device>
- *** WARNING! This will destroy all the eMMC content. Use with care! ***
- For details about the medium image layout, see the definition in
- board/freescale/common/imx/genimage.cfg.template.
- Boot the i.MX7D Pico board
- ==========================
- To boot your newly created system:
- - put a micro USB cable into the Debug USB Port and connect using a terminal
- emulator at 115200 bps, 8n1;
- - power on the board.
- Using Wifi
- ==========
- # modprobe brcmfmac
- # iwconfig wlan0 essid ACCESSPOINTNAME
- # wpa_passphrase ACCESSPOINTNAME > /etc/wpa.conf
- (enter the wifi password and press enter)
- # wpa_supplicant -Dwext -iwlan0 -c /etc/wpa.conf &
- # udhcpc -i wlan0
- # ping buildroot.org
- Enjoy!
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