Here the current documentation for the project and its Source Code. 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. In U-Boot, there are multi way to update image into emmc via U-Boot, you can chose any of one easy use for you.Everything has a beginning. The output b is a its based package including u-boot-nodtb.bin, board.dtb, and trust binaries which can be used directly with upgrade tool.Īndroid boot(boot_android), Rockchip RKIMG boot(boot_rockchip) and LInux distro boot(distro_bootcmd). Note: please copy the trust binary(optee.bin or bl31.elf from rkbin project) to u-boot root directory and rename it to tee.bin(armv7) or bl31.elf(armv8). Some developer’s will load kernels and filesystems at 0×800000 for programming to flash. Regarding the Guruplug: On the RAM side, u-Boot has the first 8 megabytes reserved. Get detail at boot option.įor trust support in SPL, we are using FIT image with 'mkimage' cmd in Makefile and its script defined in defconfig: Further reading of the text seems to indicate its dependent on the processor or board and that you may have to check the U-Boot source to know for sure. The output including u-boot.bin, spl/u-boot-spl.bin, tpl/u-boot-tpl.bin at this step, and you need to package it with mkimage tool before use with rockchip upagrade tool. In order to support debug symbol in ARM DS-5, you may need add ctags in make command: Make ARCH=arm CROSS_COMPILE=aarch64-linux-gnu. This is common and available for both Upstream U-Boot and Rockchip U-Boot. The output will including pre-loader, trust and u-boot image which is ready to use with rockchip upgrade tool, Make CROSS_COMPILE=arm-linux-gnueabi- menuconfigįor convenience, Rockchip provide a script 'make.sh' to make it easy to get everything before kernel, this script need toolchain and rkbin support. There is also menuconfig to play with settings if you feel like it: You may need to change the U-Boot function/feature support by modify the defconfig file or, Make CROSS_COMPILE=arm-linux-gnueabi- _defconfig When you have determined what you want to build, configure: Note that the latest U-Boot require version gcc-5.0 and later, we recommand to use linaro 6.3.1.įirst you need to choose a correct defconfig for your board Sudo apt-get install gcc-aarch64-linux-gnu Sudo apt-get install gcc-arm-linux-gnueabi In Ubuntu 14.04, you can use below command to install cross compiler for armv7: If you haven't done so before, get a suitable toolchain installed and add it to your PATH. EVB RK3399 - use evb-rk3399 configuration.EVB RK3328 - use evb-rk3328 configuration.PopMetal RK3288 - use popmetal-rk3288 configuration.Miniarm RK3288 - use miniarm-rk3288 configuration.Hisense Chromebook - use chromebook_jerry configuration.Firefly RK3288 - use firefly-rk3288 configuration.EVB RK3288 - use evb-rk3288 configuration.EVB RK3036 - use evb-rk3036 configuration.You can clone the u-boot repository by running:Īlternatively you can use u-boot-rockchip instead which may with some patches not get in mainline:
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