Add support for passing initrd information via flat device tree

Patch by Kumar Gala 11 Jan 2006

CHANGELOG

@@ -2,6 +2,9 @@
 Changes since U-Boot 1.1.4:
 ======================================================================
 
+* Add support for passing initrd information via flat device tree
+  Patch by Kumar Gala 11 Jan 2006
+
 * Added OF_STDOUT_PATH and OF_SOC
 
   OF_STDOUT_PATH specifies the path to the device the kernel can use

common/cmd_bootm.c

@@ -819,7 +819,7 @@ do_bootm_linux (cmd_tbl_t *cmdtp, int flag,
 	(*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end);
 
 #else
-	ft_setup(of_flat_tree, OF_FLAT_TREE_MAX_SIZE, kbd);
+	ft_setup(of_flat_tree, OF_FLAT_TREE_MAX_SIZE, kbd, initrd_start, initrd_end);
 	/* ft_dump_blob(of_flat_tree); */
 
 #if defined(CFG_INIT_RAM_LOCK) && !defined(CONFIG_E500)
@@ -828,12 +828,16 @@ do_bootm_linux (cmd_tbl_t *cmdtp, int flag,
 	/*
 	 * Linux Kernel Parameters:
 	 *   r3: ptr to OF flat tree, followed by the 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
+	 *   r4: physical pointer to the kernel itself
+	 *   r5: NULL
+	 *   r6: NULL
+	 *   r7: NULL
 	 */
-	(*kernel) ((bd_t *)of_flat_tree, initrd_start, initrd_end, cmd_start, cmd_end);
+	if (getenv("disable_of") != NULL)
+		(*kernel) ((bd_t *)of_flat_tree, initrd_start, initrd_end,
+			cmd_start, cmd_end);
+	else
+		(*kernel) ((bd_t *)of_flat_tree, (ulong)kernel, 0, 0, 0);
 
 #endif
 }

common/ft_build.c

@@ -163,7 +163,7 @@ void ft_add_rsvmap(struct ft_cxt *cxt, u64 physaddr, u64 size)
 	((u64 *) cxt->pres)[0] = cpu_to_be64(physaddr);	/* phys = 0, size = 0, terminate */
 	((u64 *) cxt->pres)[1] = cpu_to_be64(size);
 
-	cxt->pres += 18;	/* advance */
+	cxt->pres += 16;	/* advance */
 
 	((u64 *) cxt->pres)[0] = 0;	/* phys = 0, size = 0, terminate */
 	((u64 *) cxt->pres)[1] = 0;
@@ -577,7 +577,7 @@ static const struct {
 };
 #endif
 
-void ft_setup(void *blob, int size, bd_t * bd)
+void ft_setup(void *blob, int size, bd_t * bd, ulong initrd_start, ulong initrd_end)
 {
 	u32 *p;
 	int len;
@@ -602,7 +602,8 @@ void ft_setup(void *blob, int size, bd_t * bd)
 
 	ft_begin(&cxt, blob, size);
 
-	/* fs_add_rsvmap not used */
+	if (initrd_start && initrd_end)
+		ft_add_rsvmap(&cxt, initrd_start, initrd_end - initrd_start + 1);
 
 	ft_begin_tree(&cxt);
 
@@ -645,6 +646,10 @@ void ft_setup(void *blob, int size, bd_t * bd)
 	ft_prop_str(&cxt, "name", "chosen");
 	ft_prop_str(&cxt, "bootargs", getenv("bootargs"));
 	ft_prop_int(&cxt, "linux,platform", 0x600);	/* what is this? */
+	if (initrd_start && initrd_end) {
+		ft_prop_int(&cxt, "linux,initrd-start", initrd_start);
+		ft_prop_int(&cxt, "linux,initrd-end", initrd_end);
+	}
 #ifdef OF_STDOUT_PATH
 	ft_prop_str(&cxt, "linux,stdout-path", OF_STDOUT_PATH);
 #endif

include/ft_build.h

@@ -57,7 +57,7 @@ void ft_prop_int(struct ft_cxt *cxt, const char *name, int val);
 void ft_begin(struct ft_cxt *cxt, void *blob, int max_size);
 void ft_add_rsvmap(struct ft_cxt *cxt, u64 physaddr, u64 size);
 
-void ft_setup(void *blob, int size, bd_t * bd);
+void ft_setup(void *blob, int size, bd_t * bd, ulong initrd_start, ulong initrd_end);
 
 void ft_dump_blob(const void *bphp);
 void ft_merge_blob(struct ft_cxt *cxt, void *blob);