--- linux-2.6.26.5/arch/powerpc/kernel/prom.c	2008-09-08 13:40:20.000000000 -0400
+++ linux-2.6.26.5-rb600/arch/powerpc/kernel/prom.c	2008-09-20 23:51:04.795452491 -0400
@@ -797,6 +797,14 @@ static int __init early_init_dt_scan_cho
 	    (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
 		return 0;
 
+#ifdef CONFIG_BLK_DEV_INITRD
+	lprop = of_get_flat_dt_prop(node, "linux,initrd", NULL);
+	if (lprop) {
+		initrd_start = (unsigned) __va(lprop[0]);
+		initrd_end = initrd_start + lprop[1];
+	}
+#endif
+
 #ifdef CONFIG_PPC64
 	/* check if iommu is forced on or off */
 	if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL)
@@ -1154,6 +1162,11 @@ void __init early_init_devtree(void *par
 	of_scan_flat_dt(early_init_dt_scan_root, NULL);
 	of_scan_flat_dt(early_init_dt_scan_memory, NULL);
 
+#ifdef CONFIG_BLK_DEV_INITRD
+	if (initrd_start)
+		lmb_reserve(__pa(initrd_start), initrd_end - initrd_start);
+#endif
+
 	/* Save command line for /proc/cmdline and then parse parameters */
 	strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
 	parse_early_param();