4/5/2023 0 Comments U boot raspberry pi 4![]() According to documentation, if the first probed USB drive does not have a boot partition, the next drive will be probed. ![]() It would of course be better to have everything on the USB drive (and even using RAID).Īs the Raspberry Pi bootloader can only access a FAT-based boot partition, we still need a FAT-based boot partition on the USB drive. While has some very easy script to use ZFS, it still assumes an SD card for the boot and root filesystem. But at least, Raspberry Pi has the better ecosystem and ZFS has some memory debug flag that does checksums for its RAM buffers.) USB is not as stable as SATA, so an ODROID-HV4 or a Raspberry Pi 4 compute module with PCI-based SATA might be better, or a Helios64 which might in future even have ECC RAM. if the USB adapter claims data to have been written, that it has in fact not yet written, ZFS may fail - just like probably any journaling-based file system 2. The ultimate goal is to have two drives as ZFS mirrors (RAID1) connected via USB. (It should be possible to automate this, to get an idea, see: of you want to use the system headless (in fact, connecting a keyboard did not produce any input in my case), you can configure the network settings via the FAT-based boot partition: ZFS In this case, you need to copy the kernel over. Note that when you do later a kernel update inside the booted Ubuntu, it might only update the kernel image in the ext4 root partition - not in the FAT boot partition. My above steps are essentially based on where you find step-by-step instructions. That should be enough to boot Ubuntu from USB. Initramfs initrd.img followkernel (in and comment-out. elf files from the boot directory.įinally, you need to change the config.txt by adding kernel=vmlinux and Hence, I downloaded the whole Raspberry Pi firmware from GitHub (via the green Code button) and extracted the. elf files that are part of the bootstraping need to be the most recent ones. Hence, you need to uncompress the kernel manually to allow the Raspberry Pi firmware bootloader to load and start the kernel. While the Ubuntu 20.04 LTS ARM64 image has a kernel on the FAT-based boot partition, it is unfortunately compressed (because the assumed U-Boot would be able to deal with it). While U-Boot can load compressed ( vmlinuz) kernel images and can load the kernel from an ext4 root filesystem, the Raspberry Pi bootloader firmware can only load uncompressed ( vmlinux) kernel images and only from the FAT-based boot filesystem. As always, a FAT format boot partition is needed that contains a couple of files in order to boot. Luckily, the bootloader that is part of the Raspberry Pi firmware can boot Ubuntu without U-Boot. while Ubuntu 20.04 LTS works out of the box when booting from SD card, when I dd'ed the SD card onto a USB drive, booting failed because U-Boot could not load the kernel via USB. ![]() Ubuntu for Raspberry Pi uses U-Boot as bootloader, however U-Boot does not support booting from USB on Raspberry Pi, only from SD card, i.e. If you want to go for Ubuntu (not just beta as 64 bit Raspberry Pi OS, but available as stable 64 bit and support for ZFS), the following is relevant: I then dd'ed the image from SD to USB mass storage. ![]() Note that in contrast to Raspberry Pi <4, Raspberry Pi 4 stores the firmware actually in an EEPROM, not just as a file loaded at every boot from the FAT boot partition by the GPU firmware of Raspberry Pi <4). Raspberry Pi now supports booting from USB (having installed the latest firmware does not harm: I did this by booting Raspberry OS from SD card. Alternativly (did not try myself), use: Zram-config.īut you anyway might want to use USB storage instead of SD card. In order to log to RAM and write it to file system only when needed, you can use Log2RAM either by adding it manually or to apt. The default Raspberry Pi syslog logs to the normal files system, i.e. Running Raspberry Pi on SD card and syslog wear When I was new to Raspberry Pi, I followed these German instructions.
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