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********************************* Technexion i.MX8M Mini Pico board ********************************* This file documents the Buildroot support for the Technexion i.MX8M Mini Pico board. The Pico i.MX8M Mini system-on-module [1] is present in development kits like the Pico Pi i.MX8M Mini [2]. Build ===== First, configure Buildroot for the i.MX8M Mini Pico board: make imx8mmpico_defconfig Build all components: make You will find in output/images/ the following files: - bl31.bin - boot.vfat - Image - imx8-boot-sd.bin - imx8mm-pico-pi.dtb - imx8mm-pico-pi-ili9881c.dtb - imx8mm-pico-pi-sn65dsi84-hj070na.dtb - lpddr4_pmu_train_fw.bin - rootfs.ext2 - rootfs.ext4 - sdcard.img - u-boot.imx Flashing sdcard.img on the eMMC =============================== i.MX8M Mini Pico board does not have a SD card slot. The storage is an eMMC. An easy way to flash the eMMC is to use the u-boot ums command. The boards are sold pre-flashed with such a u-boot. It is assumed here that the board has already a working u-boot on eMMC and jumpers are set to boot on eMMC. See [3]. Jumper configuration for eMMC boot: J1: jumper on pins 4 and 6. J2: jumper on pins 2 and 4. In case the board was flashed with a wrong u-boot, or the eMMC is erased, u-boot can be loaded by USB Serial Download boot mode, using imx-usb-loader. See [3] and [4]. For flashing: - Plug the micro USB cable from the Debug USB Port, to your computer - Plug the USB Type C to your computer, this will power up the board In the U-Boot prompt launch: => ums 0 mmc 1 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 If your system automatically mount some device partitions, make sure to unmount them. Buildroot prepares a bootable "sdcard.img" image in the output/images/ directory, ready to be dumped on the eMMC. 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! *** This operation can take several minutes, depending on the image size. When tested, a 2MB/s transfer rate was observed. For details about the medium image layout, see the definition in board/freescale/common/imx/genimage.cfg.template. Boot the i.MX8M Mini 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, with USB Type C connector. Enjoy! [1]. https://www.technexion.com/products/system-on-modules/pico/pico-compute-modules/detail/PICO-IMX8M-MINI [2]. https://www.technexion.com/products/pico-evaluation-kits/detail/PICOPIIMX8MM1GDEV [3]. https://www.technexion.com/support/knowledgebase/boot-configuration-settings-for-pico-baseboards/ [4]. https://www.technexion.com/support/knowledgebase/loading-bootable-software-images-onto-the-emmc-of-picosom-on-pico-pi/