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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/
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