|
@@ -0,0 +1,96 @@
|
|
|
+*********************************
|
|
|
+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/
|