![]() ![]() Not hesitate and take the liberty to delay a release if there are Note: While we try to adhere to the release schedule, we will After the merge window closes, no new features may be added to allow for a release candidate phase which is intended to fix bugs and regressions.Linus Torvalds explains here and there what the term "merge window" is supposed to mean. While this merge window is open, new features can be added to the U-Boot source tree. if the release was on a Monday, then the merge window will close on the Monday in the 3rd week after the release. Immediately following each release, there will be a "merge window" of normally 21 days, i.Under normal conditions the release date will be a Monday around mid-month.We will have U-Boot releases at a fixed release interval of (approximately) every 3 months. ![]() The U-Boot projects attempts to maintain a fixed, predictable Release Here the current documentation for the project and its Source Code.Note: Documentation on how to use and develop U-Boot can be found at U-Boot Release Cycle The importance of U-Boot in embedded Linux systems is quite succinctly stated in the book Building Embedded Linux Systems, by Karim Yaghmour, whose text about U-Boot begins, “Though there are quite a few other bootloaders, ‘Das U-Boot’, the universal bootloader, is arguably the richest, most flexible, and most actively developed open source bootloader available.” It can be built on an x86 PC for any of its intended architectures using a cross development GNU toolchain. It is free software released under the terms of the GNU General Public License. The current name Das U-Boot adds a German definite article, to create a bilingual pun on the classic 1981 German submarine film Das Boot, which takes place on a World War II German U-boat. The May 2004 release of U-Boot-1.1.2 worked on the products of 216 board manufacturers across the various architectures. ![]() Additional architecture capabilities were added in the following months: MIPS32 in March 2003, MIPS64 in April, Nios II in October, ColdFire in December, and MicroBlaze in April 2004. PPCBoot−2.0.0 became U−Boot−0.1.0 in November 2002, expanded to work on the x86 processor architecture. This marked the last release under the PPCBoot name, as it was renamed to reflect its ability to work on other architectures besides the PPC ISA. In 2002 a previous version of the source code was briefly forked into a product called ARMBoot, but was merged back into the PPCBoot project shortly thereafter. Version 0.4.1 of PPCBoot was first publicly released July 19, 2000. ![]() Wolfgang Denk moved the project to and renamed it to PPCBoot, because SF.net did not allow project names starting with digits. The project started as an MPC 8xx PowerPC bootloader. It is available for a large number of different computer architectures, including 68k, ARM, Blackfin, MicroBlaze, MIPS, Nios, SuperH, PPC, RISC-V and x86. U-Boot (subtitled “the Universal Boot Loader” and often shortened to U-Boot), started by Wolfgang Denx more than 20 years ago,has become a de-facto standard for Embedded Linux Device and not only. You cannot have a running device with Embedded Linux without a bootloader that initializes the hardware and load and start the OS. ![]()
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