4/30/2023 0 Comments Das u boot tutorialAlso, it is easier to reuse default “device tree blobs”. ![]() Those bootloaders take care of GPU initialization.). Raspberry Pi, by default, has 2 bootloaders bootcode.bin and start.elf, and we need both before booting u-boot (Because Raspberry pi is using very odd SoC, which has GPU in it. It’s also capable of booting kernel from network, but it’s not the scope of this article. u-boot is, as I introduced it in the previous article, a second-stage bootloader, which is capable of booting kernel from various devices. One way to do this is, using custom bootloader “u-boot”. For Raspberry pi, toolchain is available like link below. But this is the most important step for the purpose. Toolchain is set of compilers and other tools like linker.įortunately, I already had toolchain for ARM processors (both 32bit and 64bit, thanks to Xilinx), so I skipped this step. To build both, custom bootloader and Linux kernel, we need toolchain to generate AARCH64 binary. ARM Cortex-A53 is 64bit processor, and potentially be able to perform 10–15% better if it runs 64bit code ( ). So at least, I wanted to mount root filesystem from external storage for reliability, maintainability, and performance.Īlso, I found that, Raspbian is using 32bit binary, and the kernel is compiled to 32 bit code as well. ![]() This is not really good practice, since SD card is not really reliable, and if it’s written frequently, it wears off fast. Booting Ubuntu desktop on Raspberry pi 3 Motivationīy default, Raspberry pi boots from SD card, and root filesystem is also mounted from there.
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