RB_DFLTROOT
RB_ASKNAME, RB_CDROM, RB_KDB, RB_DFLTROOT, RB_GDB, RB_MULTIPLE,
case 'r': howto |= RB_DFLTROOT; break;
{ "boot_dfltroot", RB_DFLTROOT},
if (boothowto & RB_DFLTROOT)
if (!(boothowto & RB_DFLTROOT))
if ((p == NULL || (boothowto & RB_DFLTROOT) != 0) &&