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