Using the CLI, users can load and boot a kernel, possibly changing parameters from the default. U-Boot runs a command-line interface on a console or a serial port. ![]() UEFI binaries like GRUB or the Linux kernel can be booted via the boot manager or from the command-line interface. U-Boot implements a subset of the UEFI specification as defined in the Embedded Base Boot Requirements (EBBR) specification. Regardless of whether the SPL is used, U-Boot performs both first-stage (e.g., configuring memory controllers and SDRAM) and second-stage booting (performing multiple steps to load a modern operating system from a variety of devices that must be configured, presenting a menu for users to interact with and control the boot process, etc.). DRAM initialization using CPU cache as RAM) and load the larger, fully featured version of U-Boot. If there are size constraints, U-Boot may be split into two stages: the platform would load a small SPL (Secondary Program Loader), which is a stripped-down version of U-Boot, and the SPL would do some initial hardware configuration (e.g. ![]() onchip ROM of the ARM CPU) from a supported boot device, such as an SD card, SATA drive, NOR flash (e.g. U-Boot is both a first-stage and second-stage bootloader. ![]() It is available for a number of computer architectures, including 68k, ARM, Blackfin, MicroBlaze, MIPS, Nios, SuperH, PPC, RISC-V and x86. Das U-Boot (subtitled "the Universal Boot Loader" and often shortened to U-Boot see History for more about the name) is an open-source, primary boot loader used in embedded devices to package the instructions to boot the device's operating system kernel.
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