I have Fedora managing GRUB2 and everything seems normal except i can't boot Arch, the entry appears in grub but checking the menuentry commands i realised that the initrd line points only to /boot/intel-ucode.img

I can boot Arch if i manually add /boot/intel-ucode.img /boot/initramfs-linux-rt.img to the initrd line in grub but is pretty fastidous to do it everytime i want boot Arch. I already have os-prober installed and ran grub2-mkconfig -o /boot/grub2/grub.cfg to make grub.cfg but is still the same. Maybe i can make a script with the initramfs.img line manually added to /etc/grub.d but isn't os-prober supposed to do that?

There's no man entry for os-prober, is there a way to configure it and see whats going on?

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