[PATCH/RFC] Allow CONFIG_OF_FLAT_TREE to boot a non-arch/powerpc kernel

[Grant Likely <grant.likely@secretlab.ca>]

This patch allows an arch/ppc kernel to be booted by just passing 1 or 2
arguments to bootm.  It removes the getenv("disable_of") test that used
to be used for this purpose.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
---
 common/cmd_bootm.c |   52 ++++++++++++++++++++--------------------------------
 1 files changed, 20 insertions(+), 32 deletions(-)

diff --git a/common/cmd_bootm.c b/common/cmd_bootm.c
index 3091a58..07a9f12 100644
--- a/common/cmd_bootm.c
+++ b/common/cmd_bootm.c
@@ -833,10 +833,6 @@ #endif
 			printf ("ERROR: flat device tree size does not agree with image\n");
 			return;
 		}
-
-	} else if (getenv("disable_of") == NULL) {
-		printf ("ERROR: bootm needs flat device tree as third argument\n");
-		return;
 	}
 #endif
 	if (!data) {
@@ -913,23 +909,11 @@ #endif	/* CONFIG_HW_WATCHDOG || CONFIG_W
 
 	SHOW_BOOT_PROGRESS (15);
 
-#ifndef CONFIG_OF_FLAT_TREE
-
 #if defined(CFG_INIT_RAM_LOCK) && !defined(CONFIG_E500)
 	unlock_ram_in_cache();
 #endif
 
-	/*
-	 * Linux Kernel Parameters:
-	 *   r3: ptr to board info data
-	 *   r4: initrd_start or 0 if no initrd
-	 *   r5: initrd_end - unused if r4 is 0
-	 *   r6: Start of command line string
-	 *   r7: End   of command line string
-	 */
-	(*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end);
-
-#else	/* CONFIG_OF_FLAT_TREE */
+#ifdef CONFIG_OF_FLAT_TREE
 	/* move of_flat_tree if needed */
 	if (of_data) {
 		ulong of_start, of_len;
@@ -949,29 +933,33 @@ #else	/* CONFIG_OF_FLAT_TREE */
 		memmove ((void *)of_start, (void *)of_data, of_len);
 	}
 
-	ft_setup(of_flat_tree, kbd, initrd_start, initrd_end);
-	/* ft_dump_blob(of_flat_tree); */
-
-#if defined(CFG_INIT_RAM_LOCK) && !defined(CONFIG_E500)
-	unlock_ram_in_cache();
+	/*
+	 * Linux Kernel Parameters (passing board info data):
+	 *   r3: ptr to board info data
+	 *   r4: initrd_start or 0 if no initrd
+	 *   r5: initrd_end - unused if r4 is 0
+	 *   r6: Start of command line string
+	 *   r7: End   of command line string
+	 */
+#ifdef CONFIG_OF_FLAT_TREE
+	if (!of_flat_tree)	/* no device tree; boot old style */
 #endif
+		(*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end);
+		/* does not return */
+
 	/*
-	 * Linux Kernel Parameters:
+	 * Linux Kernel Parameters (passing device tree):
 	 *   r3: ptr to OF flat tree, followed by the board info data
 	 *   r4: physical pointer to the kernel itself
 	 *   r5: NULL
 	 *   r6: NULL
 	 *   r7: NULL
 	 */
-	if (getenv("disable_of") != NULL)
-		(*kernel) ((bd_t *)of_flat_tree, initrd_start, initrd_end,
-			cmd_start, cmd_end);
-	else {
-		ft_setup(of_flat_tree, kbd, initrd_start, initrd_end);
-		/* ft_dump_blob(of_flat_tree); */
-		(*kernel) ((bd_t *)of_flat_tree, (ulong)kernel, 0, 0, 0);
-	}
-#endif	/* CONFIG_OF_FLAT_TREE */
+	ft_setup(of_flat_tree, kbd, initrd_start, initrd_end);
+	/* ft_dump_blob(of_flat_tree); */
+
+	(*kernel) ((bd_t *)of_flat_tree, (ulong)kernel, 0, 0, 0);
+#endif
 }
 #endif /* CONFIG_PPC */
 
-- 
1.4.3.rc2.g0503