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-****************************
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-Technexion i.MX8M Pico board
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-****************************
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-
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-This file documents the Buildroot support for the Technexion i.MX8M
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-Pico board. The Pico i.MX8M system-on-module [1] is present in
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-development kits like the Pico Pi i.MX8M [2].
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-
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-Build
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-=====
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-
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-First, configure Buildroot for the i.MX8M Pico board:
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-
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- make imx8mpico_defconfig
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-
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-Build all components:
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-
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- make
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-
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-You will find in output/images/ the following files:
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- - bl31.bin
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- - boot.vfat
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- - Image
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- - imx8-boot-sd.bin
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- - lpddr4_pmu_train_fw.bin
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- - pico-8m-dcss-ili9881c.dtb
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- - pico-8m.dtb
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- - rootfs.ext4
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- - sdcard.img
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- - signed_hdmi_imx8m.bin
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- - u-boot.imx
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-
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-Flashing sdcard.img on the eMMC
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-===============================
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-
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-i.MX8M Pico board does not have a SD card slot. The storage is an
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-eMMC. An easy way to flash the eMMC is to use the u-boot ums
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-command. The boards are sold pre-flashed with such a u-boot. It is
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-assumed here that the board has already a working u-boot on eMMC and
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-jumpers are set to boot on eMMC. See [3].
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-
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-Jumper configuration for eMMC boot:
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-J1: jumper on pins 4 and 6.
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-J2: jumper on pins 2 and 4.
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-
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-In case the board was flashed with a wrong u-boot, or the eMMC is
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-erased, u-boot can be loaded by USB Serial Download boot mode, using
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-imx-usb-loader. See [3].
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-
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-For flashing:
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-- Plug the micro USB cable from the Debug USB Port, to your computer
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-- Plug the USB Type C to your computer, this will power up the board
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-
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-In the U-Boot prompt launch:
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-
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-=> ums 0 mmc ${mmcdev}
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-
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-This will mount the eMMC content in the host PC as a mass storage device.
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-Note: the ${mmcdev} id may change from one uboot version to another. The
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-actual id can be confirmed by running commands "mmc rescan" then
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-"mmc list", to find the eMMC entry. Finally it's possible to enter
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-directly the mmc device id, for example: "ums 0 mmc 2".
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-
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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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-
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- cat /proc/partitions
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-
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-If your system automatically mount some device partitions, make sure
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-to unmount them.
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-
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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. Launch the following
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-command as root:
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-
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- dd bs=1M if=output/images/sdcard.img of=/dev/<your-sd-device>
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-
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-*** WARNING! This will destroy all the eMMC content. Use with care! ***
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-
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-This operation can take several minutes, depending on the image
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-size. When tested, a 10MB/s transfer rate was observed. Note: the
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-blocksize "bs=1M" parameter gives better transfer performances.
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-
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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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-
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-Boot the i.MX8M Pico board
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-==========================
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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, with USB Type C connector.
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-
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-Enjoy!
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-
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-[1]. https://www.technexion.com/products/system-on-modules/pico/pico-compute-modules/detail/PICO-IMX8M
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-[2]. https://www.technexion.com/products/system-on-modules/evk/pico-pi-imx8m/
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-[3]. https://developer.technexion.com/docs/pico-evaluation-kit-boot-mode-settings#picoimx8m-and-picoimx8mmini
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