On Sun, May 18, 2014 at 01:33:15PM +0800, Z C wrote: > If I boot into a linux kernel using a grub command like "linux /vmlinuz; > inirtd /initrd; boot", how do I shutdown linux itself (but do not power off > or reboot the computer hardware) and return back to the grub directly? > > What I meant is something equivalent to the "exit" command in most shells: > If you are within one shell and you enter another shell, then if you want > to quit the second shell and return back to the first shell, just simply > type exit. All env variables and commands you previous typed in the first > shell are completely intact. > > Suppose I am now in the grub shell, and then I boot into a tiny linux > kernel, say, a busybox shell, then what can I do to exit the second shell > (i.e. busybox shell) and return to the first shell (i.e. grub shell)? Of > course I can enter the grub shell again by simply rebooting the hardware, > but this is not what I want.
Once linux boots, it does not preserve the boot loader in memory (whyever would it do that?) If you want to invent a way to load grub using kexec so you can switch back to grub fropm a running linux system, well have fun, but why bother? Where is the use? It is so hard to deal with what the state of all the hardware is without doing a reset. -- Len Sorensen _______________________________________________ Grub-devel mailing list Grub-devel@gnu.org https://lists.gnu.org/mailman/listinfo/grub-devel
