Le 18/11/2021 à 03:07, onefang a écrit : > Um, initramfs already uses busybox. Or it can, it's an option in > initramfs-tools.
Initramfs can use what you want to provide what is bundled by Debian in binutils and util-linux, + a shell. Busybox provides you with all that, and much more, ready-made. Aboriginal was a distro in which all of these applications was actually provided by busybox - I didn't look recently. The initramfs typically contains a script named /sbin/init, which is the default application launched by the kernel when it has finished booting. If the initramfs is based on busybox, then this script is interpreted by one of the shells provided by busybox (or it could be busybox's init), and all the userspace applications are also provided by busybox. YOU DON'T NEED AN INITRAMFS TO DO THAT. THIS INIT SEQUENCE CAN BE DONE OUT OF A DISK PARTITION IF THE KERNEL IS ABLE TO MOUNT IT. The advantage of such a set up is that you can modify your script from another OS mounting this partition. The application to launch by the kernel is given as an argument to the kernel when invoked by the bootloader (grub, uboot). In case of a bootloader firmware which lacks the possibility to provide arguments to the kernel, it is possible to define the default init when configuring the kernel. Just to experiment with busybox, give to the kernel the argument init="/bin/busybox ash" . After boot, you get the prompt; first invoke 'busybox install'; export PATH='/bin:/sbin:/usr/bin:/usr/sbin' (depending how you have prepared your boot partition and configured your busybox) and then 'mount -t proc proc /proc', and experiment... By default, the kernel will invoke /sbin/init. If you are running out of a partition and not initramfs, you need to invoke 'busybox install' only once and this can be done in advance by chrooting into the partition. There are many possibities ... up to your imagination. -- Didier _______________________________________________ Dng mailing list Dng@lists.dyne.org https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/dng