![]() ![]() To learn more about specific themes visit the U-boot on-line manual at the site. This section is a quick guide to the U-boot command line. $ make ARCH=arm CROSS_COMPILE= bootz 0x46000000 - 0x49000000`Īt the next boots the board will boot automatically. You can download U-boot from Github typing the following commands:Ĭonfigure and build U-boot it's easy because U-boot supports many Orange Pi boards via defconfig, so you just need to type: We suggest the use of Das U-boot: it's an open source bootloader used especially to load Linux in several architectures including ARM. The bootloader is the program that loads the Operating System kernel from the secondary memory to the primary memory (generally RAM) so the processor can excute it and starts the boot of the system. The next step is the cross compilation of the bootloader. ![]() ![]() Warranty not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. This is free software see the source for copying conditions. The output of this command should be something like:Īrm-linux-gnueabihf-gcc (Linaro GCC 7.2.1-2017.11) 7.2.1 20171111Ĭopyright (C) 2017 Free Software Foundation, Inc. You can verify the correct installaton of the cross compiler typing the command: It's suggested for the next uses to save the path of the cross compiler in an enviroment variable: Then extract the tarball with the followign command: Alternatively you can open a terminal and use wget command, for example to downloade the release 7.2.1-2017.11 you have to type: To download the latest release you can visit this site, choose a release and download the tarball gcc-linaro-x86_64_. We suggest the use of Linaro GCC toolchain. This will interrupt the U-Boot bootcmd sequence and let you enter the U-Boot command monitor:įrom the command monitor, you would be able to reset bootdelay to 3 or whatever value makes sense to you.The first step to do is getting an ARM cross compiler. ![]() To do so, push the Ctrl-C keys down on the serial console and don't release them until you have hit the reset button on the baseboard. With bootdelay set to 0 the U-Boot countdown is disabled, so there is a question how you enter the U-Boot command monitor, should you need that for some reason. This will make sure that on each power on / reset U-Boot immediately executes the command defined by bootcmd, typically booting Linux from the on-module Flash. In deployed configurations, where boot time to the service provided by your embedded device is critical, you will probably want to set bootdelay to 0: The latter is how bootcmd is set on the modules at the factory. Typically, this would be run netboot to boot Linux from TFTP during development or run flashboot to boot Linux from the NAND Flash on deployed units. The bootcmd variable defines a command executed by U-Boot automatically after the bootdelay countdown is over. This will let you enter the U-Boot command line interface. During the bootdelay countdown, you can interrupt the autobooting by pressing any key. The bootdelay variable defines a delay, in seconds, before running the autoboot command defined by bootcmd. The Linux autoboot sequence in U-Boot is controlled by the two environment variables called bootdelay and bootcmd. ![]()
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