Fastboot is a protocol for communication between your device and a computer. It allows you to modify file system images over a USB connection, which is a quick way to update firmware during development. Fastboot requires the USB interface to work as 'device'.
Although it was originally developed for Android images, its implementation on the NXP UUU (Universal Update Utility) tool extends the functionality to any file type.
To update U-Boot via USB OTG using uuu and the Fastboot protocol:
-
Download the latest Universal Update Utility (UUU), a software tool from NXP.
UUU version should be v1.5.11 or higher. -
Place the
uuu
executable in a directory in your PATH, such as/usr/bin
. -
Install
udev
rules to allow any user to runuuu
to access the USB port:$ sudo sh -c "uuu -udev >> /etc/udev/rules.d/70-uuu.rules" $ sudo udevadm control --reload
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Connect a USB type-C cable to your development PC and the other end to the target USB type-C connector.
-
Reset the device by pressing the reset button on the board and immediately press any key in the serial terminal to stop the auto-boot process. The U-Boot bootloader prompt displays:
U-Boot SPL dub-2020.04-r6.1 (Sep 19 2023 - 07:15:55 +0000) Normal Boot Trying to boot from MMC1 Primary set selected Load image from MMC/SD 0x59c00 U-Boot dub-2020.04-r6.1 (Sep 19 2023 - 07:15:55 +0000) CPU: NXP i.MX8QXP RevC A35 at 1200 MHz at 33C DRAM: 2 GiB MCA: HW_VER=1 FW_VER=1.01 MMC: FSL_SDHC: 0, FSL_SDHC: 1 In: serial Out: serial Err: serial Model: Digi International ConnectCore 8X SBC Pro Board. ConnectCore 8X SOM variant 0x02: 2 GiB LPDDR4, Wi-Fi, Bluetooth, MCA, Crypto-auth Board version 3, ID 135 Boot: MMC0 BuildInfo: - SCFW 6638c032, SECO-FW c9de51c0, IMX-MKIMAGE 3bfcfccb, ATF e4b2dbf - U-Boot dub-2020.04-r6.1 flash target is MMC:0 Net: eth0: ethernet@5b040000 [PRIME], eth1: ethernet@5b050000 Fastboot: Normal Normal Boot Hit any key to stop autoboot: 0 =>
Information in the console log may vary. -
On the target, in U-Boot, execute the following command:
=> fastboot 1
-
On your development PC, change to your Digi Embedded Yocto project’s deploy images folder:
$ cd tmp/deploy/images/ccimx8x-sbc-pro/
-
Run the
install_linux_fw_uuu.sh
script with-h
parameter to check the syntax:$ ./install_linux_fw_uuu.sh -h ############################################################ # Linux firmware install through USB OTG # ############################################################ Usage: ./install_linux_fw_uuu.sh [options] Options: -b Activate bootcount mechanism (3 boot attempts). -d Install firmware on dualboot partitions (system A and system B). (Implies -b). -h Show this help. -i <dey-image-name> Image name that prefixes the image filenames, such as 'dey-image-qt', 'dey-image-webkit', 'core-image-base'... Defaults to 'dey-image-qt' if not provided. -k <dek-filename> Update includes dek file. (implies -t)." -n No wait. Skips 10 seconds delay to stop script. -t Install TrustFence artifacts. -u <u-boot-filename> U-Boot filename. Auto-determined by variant if not provided.
-
To program the default image files (dey-image-qt):
$ ./install_linux_fw_uuu.sh
-
Once the firmware is installed, the device boots automatically. The default username is root with no password.