1/3/2024 0 Comments U boot raspberry pi 4![]() Listing 6 executes the necessary commands. In addition, you will need to modify the config.txt file ( Listing 5) that loads in the relevant u-boot-stubbed.bin version. To install, you should copy the file to the boot partition of the microSD card (see Table 1). This file represents the prepared 64-bit executable version. Download the Git source code on your home computer, set the generating variables ARCH and CROSS_COMPILE, configure U-Boot for the RPi3, and finally, let the boot launch with make.Īfter this operation is complete, the u-boot.bin file will be found along with others in the bootloader's source code directory. # mkimage -A arm64 -O linux -T script -C none -d boot.txt īy the way, just as with the kernel, the U-Boot bootloader can also be easily generated as a 64-bit version. # make CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 \ Upon completion of all of these preparations, you will have a fully functional system after unmounting both of the partitions again. The script gets a U-Boot header with the help of the Mkimage program from the u-boot-utils package ( Listing 4). Listing 3 shows the U-Boot script, boot.txt. However, the new names for the kernel and device tree will definitely require that U-Boot's bootloader configuration be modified. The professional approach to installation involves copying the kernel under its own name to the microSD card, using the correct device tree, and most importantly, locating the kernel module on the root partition. Once the power is turned on, the computer should boot the self-generated kernel. ![]() Therefore you should unmount the card right after copying the kernel and insert it into the Rasp Pi. The device tree that is also found on the SD card is suitable for the first test. However, one of the neat things about U-Boot is that it can provide netboot capabilities, so that you can boot your device from images across the network (we’re just going to use it to boot a kernel and initramfs, however). If you want to make absolutely sure, you should save the 64-bit kernel with the same name that is on the SD card before you overwrite it with your own kernel. The Raspberry Pi actually has native support for booting a kernel, you don’t have to use U-Boot. The U-Boot script found on the boot partition will be waiting there under that name, thus saving the need for any modification to the configuration. Impatient users can simply copy the self-compiled kernel arch/arm64/boot/Image to the boot partition ( Figure 4). ![]() There are two possibilities for installing your own kernel: a method for impatient users and the professional method. Then you can unmount the boot and root partitions again. The cp command only copies the kernel you have compiled yourself to the boot partition as an Image file. Raspberry Pi U-Boot 4.5Mbytes (Using U-Boot 2014.Figure 4: Here, Ubuntu has mounted the microSD card.It can be restored using the Win32 Disk Imager Edit the config.txt file to include the following line:īelow is a prepared FAT16 image. Once compiled, u-boot.bin can be copied to your SD Card. Make CROSS_COMPILE=arm-linux-gnueabi- u-boot.bin ![]() Make CROSS_COMPILE=arm-linux-gnueabi- rpi_b_config Make CROSS_COMPILE=arm-linux-gnueabi- distclean Now cross compile U-Boot using the Raspberry Pi Model B configuration: To download and extract the latest mainline version of U-Boot:Īlternatively, if you require USB support, use Stephen Warren GIT repository: It is understood Stephen Warren is working on getting USB support into the mainline U-Boot repository. As the ethernet port on the Raspberry Pi is connected to the Broadcom SoC via USB, no support for USB not only effects your use of USB input devices such as a keyboard, USB storage devices (booting from USB thumb drive) but also Network (TFTP loads). Raspberry Pi support in the current mainline U-Boot is functional, but excludes support for USB. I use gcc-4.7.3-arm-linux-gnueabi that comes with Ubuntu 14.04. To compile the U-Boot bootloader for the Raspberry Pi, you must first have an ARM cross compiler installed.
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