Documentation
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Overview ¶
madeye merges multiple architecture u-root initramfs to form a single universal initramfs.
Synopsis:
madeye initramfs [initramfs...]
u-root was intended to be capable of function as a universal root, i.e. a root file system that you could boot from different architectures. We call this ability Multiple Architecture Device Image, or MADI, pronounced Mad-Eye. (Apologies to Harry Potter.)
Given a set of images, e.g. initramfs.linux_<arch>.cpio, madeye derives the architecture from the name. It then reads the cpio in. For a distinguished set of directories, it relocates them from / to /<arch>/, a la Plan 9. If there is a /init, it moves to /<arch>/init. It adjusts absolute path symlinks.
To boot a kernel with a MadEye, one must adjust the init= arg to prepend the architecture. For example, on arm it would be init=/arm/init. For now, this only works for bb mode.
TODO: look for conflicting dev entries, and write them out.
TODO: derive arch from the ELF file of bb instead of the name.
Source Files