The following is an extract of what the console shows when U-Boot is initialized and autoboot is prevented by entering into the console. By default, U-Boot waits up to 3 seconds before starting the autoboot sequence. Once you can read the output from your host machine, the U-Boot Console can be easily accessed by pressing any button before the autoboot sequence starts. For detailed information on how to set up and configure the serial port on your host machine see our Quickstart Guide. In order to visualize the serial output from a host machine, a serial port reader program such as minicom or PuTTy is commonly set to read the corresponding USB serial port (e.g. While U-Boot's console output is also visible on the parallel RGB display (and with the carrier boards RAMDAC on VGA) a USB keyboard directly connected to the module does not work as of yet. The Iris Board routes this UART through a TTL to RS232 converter to a header (see Serial Adapter Cable on Iris). The Colibri and Apalis evaluation boards route this UART through a USB to Serial converter to a USB B connector or through a TTL to RS232 converter to a DB9 connector (see Colibri Evaluation Board, Apalis Evaluation Board). When U-Boot is running in RAM, it sends its output through the primary Full Function (FF) UART (usually UART_A). Built your own image from the Toradex Open Embedded meta layers in our git repositories.Used our Toradex Easy Installer to install a compatible image from our feed servers.Installed a compatible image from the Linux Software page on our site. ![]() A running U-Boot is automatically available if you have: In order to access the U-Boot console, you obviously need a running U-Boot in your module. To learn how to build your own U-Boot version, please refer to Build U-Boot and Linux Kernel from Source Code. This article explains how to manage the console and the environment variables in a running U-Boot so that you are able to troubleshoot, modify, or set up your own booting configuration. You can find the code in our repositories. Toradex also uses U-Boot as the bootloader for its images. The most remarkable achievement, however, is its good driver assortment, which has established it as the preferred bootloader for most embedded platforms. It features a console interface through the serial port with low-level commands and environment variables that provide high flexibility when configuring the boot process. Today, U-Boot is a fully-fledged bootloader supporting more than a dozen architectures, several filesystems, and a handful of interfaces. ![]() Shortly thereafter it was renamed U-Boot (short for Das Universal Boot) to reflect its evolution into a multi architectural bootloader. It has its origins in a very simple bootloader designed for the PowerPC architecture which was publicly released in 2000 under the name of PPCBoot. U-Boot is an open-source bootloader commonly used in embedded devices. Is this page helpful? U-Boot Introduction
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