bootm: Add subcommands

Add the ability to break the steps of the bootm command into several
subcommands: start, loados, ramdisk, fdt, bdt, cmdline, prep, go.

This allows us to do things like manipulate device trees before
they are passed to a booting kernel or setup memory for a secondary
core in multicore situations.

Not all OS types support all subcommands (currently only start, loados,
ramdisk, fdt, and go are supported).

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/lib_m68k/bootm.c b/lib_m68k/bootm.c
index c52dd2f..0798e07 100644
--- a/lib_m68k/bootm.c
+++ b/lib_m68k/bootm.c
@@ -76,6 +76,9 @@
 	void  (*kernel) (bd_t *, ulong, ulong, ulong, ulong);
 	struct lmb *lmb = &images->lmb;
 
+	if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
+		return 1;
+
 	bootmap_base = getenv_bootm_low();
 
 	/* allocate space and init command line */