![]() By using these commands, the data can be read from or written to any storage system that U-Boot supports. U-Boot’s commands are actually generalized commands which can be used to read or write any arbitrary data. U-Boot boots an operating system by reading the kernel and any other required data, e.g., device tree or ramdisk image) into memory, and then executing the kernel with the appropriate arguments. The first stage configures memory controllers & SDRAM, and the second stage is booting load modem operating system from many devices that must be configured. ![]() The platform loads a small SPL, which is a toned-down version of U-Boot, and the U-Boot performs at the first stage. If the size is an issue, you can split Das U-Boot into multiple stages. Other features are recognizing multiple exe formats, support non-Multiboot kernels, multiple modules, menu interface, flexible CLI, automatic decompression of data, independent of drive geometry translations, logical block address mode, network booting, and remote terminal support.ĭas U-Boot is the first stage and second stage bootloader that can be loaded by BIOS or ROM from a supported boot device like SD card, flash memory, NAND, or SATA drive. In addition, it can be installed on Master boot record (MBR), GUID Partition Table (GPT), and Unified Extensible Firmware Interface (UEFI). It supports a wide range of operating systems, including GNU/Linux, BSD, Solaris, as well as Microsoft Windows. The proprietary kernels like Windows NT and DOS are supported via chain loading functions. GNU GRUB has backward compatibility for booting FreeBSD, OpenBSD, NetBSD, and Linux. ![]() The basic functions are for the end-users along with the rich functionalities to support kernel designers and experts. ![]() The kernel, in response, initiates the remaining operating system. The software is responsible for transferring and loading the controls to the current operating system kernel software like Linux or The Hurd. ![]() It is among the first few programs that run when a computer starts. GNU GRUB is a Multiboot boot loader that is originally derived from the project Grand Unified Bootloader. ![]()
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