$ hello-aarch64.elf -O srec hello-aarch64.srec The program can be compiled and an s-record file created by using the following commands: CROSS_COMPILE= /opt/aarch64-none/bin/aarch64-none. asciz 'Hello, aarch64 bare-metal world! 'īecause we will call the program from u-boot and don't want to crash it, the program should be compliant with the ARM Procedure Call Standard for the ARM 64-bit Architecture - this is somewhat overkill here because we are not calling any function, but it does not matter. You can now use all available u-boot commands for examining/changing the memory, and loading/executing a program:Ĭreate a file named hello-aarch64.s with the following content. If you enter the reset command, the pi will reboot, but u-boot will stop: U-Boot> reset The bootdelay environment variable is set to 2 (seconds), you need to set it to -1 (infinite) in order to avoid using CTRL+C every time you boot: U-Boot> printenv bootdelay

*** Warning - bad CRC, using default environment You could now power-up your device, and press CTRL+C as soon as possible to interrupt the boot process: U-Boot 2019.01 (16:07:23 -0400)

Installing the SD-Card into the Raspberry-pi3,Īssuming you have a serial-to-USB dongle installed and a terminal emulator configured to use the USB serial port with the following settings: 115200 bps, 8 data bits, 1 stop bit, no parity, no hardware flow control Make CROSS_COMPILE=/opt/aarch64-none/bin/aarch64-none- ARCH=arm64 rpi_3_defconfig allĬopying u-boot.bin to the SD-card - it should now contain the following files: 06:03 PM 108 config.txt Update: a convenient alternative could be to install u-boot on your SD-card based on the excellent procedure described here.Īssuming you would have the aarch64-none toolchain installed in /opt so that the path to aarch64-none-gcc would be: /opt/aarch64-none/bin/aarch64-none-gccĪ simplified procedure suitable to your needs would be:Ĭreating a minimal config.txt on your SD-card, enable_uart=1Ĭopying bootcode.bin, fixup.dat and start.elf to the SD-card, But you could use toolchains built by individuals for OSX, such as this one provided by Sergio Benitez. Regarding the toolchain, Linaro and ARM are only providing toolchains for Linux and mingw as far as I know. hex from from a compiled executable using the following command: aarch64-none-objcopy program.elf -O ihex example.elf example.hex

hex format for convenience.įor the record, you can create a. His bootloader allows uploading files in. I would suggest to have a look at David Welch's aarch64 examples for the RaspberryPi 3 here.

Raspberry pi 3b emulator mac