@juliank my assumption is that nothing prevents it, other than someone writing that code.
Attached is a patch for flash-kernel that will handle the compression, if needed, of kernel images for the m400. One alternate solution might be to try and copy the firmware-provided device tree data into a different memory location before loading the kernel in the boot.scr script. On one hand, that would limit the changes to code that only runs on these devices. But on the other hand, the generated uImage/uInitrd files wouldn't be usable for netbooting, as I don't think there's a way to inject memory copy commands into a config file for u-boot's pxelinux emulation. Note that we'll need to update the MAAS image generation code as well to keep that working. ** Patch added: "0001-Introduce-Boot-Kernel-Max-Size-and-support-for-compr.patch" https://bugs.launchpad.net/ubuntu/+source/flash-kernel/+bug/1954692/+attachment/5557834/+files/0001-Introduce-Boot-Kernel-Max-Size-and-support-for-compr.patch ** Also affects: maas-images Importance: Undecided Status: New ** Changed in: flash-kernel (Ubuntu) Status: New => In Progress ** Changed in: flash-kernel (Ubuntu) Assignee: (unassigned) => dann frazier (dannf) -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1954692 Title: Reconsider compressed kernels on arm64 Status in maas-images: New Status in flash-kernel package in Ubuntu: In Progress Status in linux package in Ubuntu: Triaged Bug description: Compressed kernel images were introduced in bug 1384955 to work around some limits on old u-boot systems. This in turn broke grub-check- signatures, meaning that while cloud images booted in secure boot, you could not upgrade grub or install new kernels on secure systems as that would trigger a "you have unsigned kernels" message. grub 2.06 also fails to boot the images, as it verifies before decompressing. Work to fix grub to handle such images on arm64 for backward compatibility is tracked in bug 1954683. This bug is to reconsider whether the change is still necessary or could be removed in 22.04 such that we can have proper UEFI executables again. To manage notifications about this bug go to: https://bugs.launchpad.net/maas-images/+bug/1954692/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
