On Monday, May 30, 2011 1:42:39 pm Dieter BSD wrote: > And it works great. Except that one of the 27 stages of boot > code that FreeBSD uses INSISTS on booting the active slice, > so you can tell the MBR to boot slice 3 and slice 3's boot > code sees that slice 4 is active and boots slice 4.
There are only 3 stages, and boot1.S is what looks at the active slice. Unfortunately it doesn't have a better way to do this as the only input it gets from boot0 or any other MBR boot loader is the BIOS drive number in %dl. I'm not sure how else you would detect that a non-active slice was booted from when that is your only input. One could define some extended structure to pass that information and send it in a register, but you'd still have to cope with MBR boot loaders that don't pass it (e.g. the Windows ones if you are dual-booting with Windows) and you'd need to have some sanity checks to make sure one doesn't treat garbage input as valid. -- John Baldwin _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
