bootblk_command
static struct bootblk_command _cmd_ ## tag = { key, desc, func, 0 };\
static struct bootblk_command _cmd_ ## tag = { key, desc, func, 1 };\
SET_DECLARE(Xcommand_set, struct bootblk_command);
struct bootblk_command **cmdp;
struct bootblk_command **cmdp;