configs/imx8mpico: new defconfig

Signed-off-by: Julien Olivain <juju@cotds.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

1 files changed, 95 insertions, 0 deletions

diff --git a/board/technexion/imx8mpico/readme.txt b/board/technexion/imx8mpico/readme.txt
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+****************************
+Technexion i.MX8M Pico board
+****************************
+
+This file documents the Buildroot support for the Technexion i.MX8M
+Pico board. The Pico i.MX8M system-on-module [1] is present in
+development kits like the Pico Pi i.MX8M [2].
+
+Build
+=====
+
+First, configure Buildroot for the i.MX8M Pico board:
+
+  make imx8mpico_defconfig
+
+Build all components:
+
+  make
+
+You will find in output/images/ the following files:
+  - bl31.bin
+  - boot.vfat
+  - Image
+  - imx8-boot-sd.bin
+  - lpddr4_pmu_train_fw.bin
+  - pico-8m-dcss-ili9881c.dtb
+  - pico-8m.dtb
+  - rootfs.ext4
+  - sdcard.img
+  - signed_hdmi_imx8m.bin
+  - u-boot.imx
+
+Flashing sdcard.img on the eMMC
+===============================
+
+i.MX8M 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 0
+
+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 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
+[2]. https://www.technexion.com/products/system-on-modules/pico-evaluation-kits/detail/PICO-PI-IMX8M-BASIC
+[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/