// After (fixed) static int lpro_probe(struct platform_device *pdev) // ... allocate ramdisk ... ret = device_register(&lpro_device); if (ret) dev_err(&pdev->dev, "Failed to register device\n"); return ret;
// Before (buggy) static int lpro_probe(struct platform_device *pdev) // ... allocate ramdisk ... // Missing: device registration return 0;
# Ubuntu sudo apt install linux-image-generic-hwe-22.04 sudo dnf upgrade kernel Arch sudo pacman -S linux-lts lpro aio ramdisk device not registered better
Remember: The word "better" in the error log is a developer’s note to themselves. Your job is to give the system a "better" way to register that device—and now you have the tools to do exactly that. If this guide helped you, share it on forums or GitHub issues. If the error persists, post your dmesg output, kernel version, and distribution details in a comment below or on a relevant subreddit like r/linuxquestions.
lpro.mem=256M # Allocate 256 MB for LPRO ramdisk aio=legacy # Use legacy AIO (if supported) memmap=128M$0x2000000 # Reserve contiguous memory For GRUB, edit /etc/default/grub and add to GRUB_CMDLINE_LINUX_DEFAULT , then run sudo update-grub . Older kernels (before 5.4) had spotty AIO ramdisk support, especially for custom drivers. Upgrade to a newer long-term support (LTS) kernel: allocate ramdisk
sudo modprobe lpro_core sudo modprobe aio_ramdisk # or aio_ram depending on your kernel The exact module name varies. Search your kernel’s module directory:
Last updated: May 2026 – Compatible with Linux kernels 5.4 through 6.12. If this guide helped you, share it on
find /lib/modules/$(uname -r) -name "*lpro*" -o -name "*aio*ram*" The error often occurs because the initramfs lacks LPRO modules. Rebuild it: