My question is: what can I do to see serial output of what start.elf is doing and expecting?Īccording to this Github issue (this is for RPi4, but as long as you have recent versions of bootcode.bin & start.elf the same config.txt parameters should apply) you are correct and uart_2ndstage=1 should enable UART debugging for both Second Stage bootloader ( bootcode.bin) and GPU firmware ( start.elf):
My original question still stands, however. By manually decompressing the image, the Pi boots. Ubuntu gives compressed images by default. Setting arm_64bit=1 (or any non empty value) makes it so either the bootcode.bin or start.elf expect a non-compressed kernel image. This leads to an identical hang.Įdit: I have found the cause of my issue. I have further set the option start_debug=1 in my config.txt and see that start_db.elf is now being loaded, but do not get any additional serial output.Īs an additional test I have set the same options in the config.txt when used from an sdcard, so setting the serial options as well as using the adjusted boot loader and kernel. According to the Raspberry Pi Documentation, the option should also enable serial output for start.elf, but that is not the case.
I have set uart_2ndstage=1 in my config.txt, which has given me serial output of bootcode.bin, which shows config.txt, start.elf, and fixup.dat get loaded. From my tftp server logs I can see that all correct files are being loaded, but the Pi still does not progress past the rainbow splash screen. To do this, I have replaced the Ubuntu u-boot boot loader with the Pi boot loader, as instructed in the Ubuntu documentation. Other boot options should be used only under the direction of technical staff.I am attempting to netboot Ubuntu 20.04.1LTS arm64 on a Raspberry Pi 3B v1.2. It provides a "known good" release from which you can boot the storage system if it fails to automatically boot the primary image.
HOW TO NETBOOT ONTAP SOFTWARE UPGRADE
The backup release is created during the first software upgrade to preserve the kernel that shipped with the storage system. By default, the boot_ontap and boot_primary commands load the same kernel.īoots the backup Data ONTAP release from the boot device. This option overrides the firmware AUTOBOOT_FROM environment variable if it is set to a value other than PRIMARY. By default, the storage system automatically boots this release if you do not select another option from the basic menu.īoots the Data ONTAP release stored on the boot device as the primary kernel.
HOW TO NETBOOT ONTAP PC
You can also boot the storage system with the following boot options from the boot environment prompt:īoots the current Data ONTAP software release stored on the boot device (such as a PC CompactFlash card). You can also boot Data ONTAP remotely from the CLI prompt of the remote management device, for example, SP> or RLM>.
You can boot the storage system from the storage system prompt, for example, toaster>. You can boot the storage system from the storage system prompt, the CLI prompt for the remote management device, or the boot environment prompt.
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