U-Boot (Universal Boot-loader), developed by Denx Software Engineering, is an open-source bootloader commonly used in embedded systems. It serves as the initial program that loads the operating system, notably the Linux kernel, into DRAM and prepares the system for execution. U-Boot is highly configurable and supports a wide range of architectures and hardware platforms. Moreover, it is licensed as free software under the GNU General Public License, fostering collaborative development and widespread adoption.
Refer to:
https://www.denx.de/project/u-boot/ U-Boot
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