1 files changed, 30 insertions, 18 deletions

diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 483455c5bb02..ce02c056ac3f 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -30,6 +30,7 @@
 #include <linux/bitops.h>
 #include <linux/module.h>
 #include <linux/kexec.h>
+#include <linux/debugfs.h>
 
 #include <asm/prom.h>
 #include <asm/rtas.h>
@@ -1124,24 +1125,6 @@ static int __init early_init_dt_scan_chosen(unsigned long node,
                 tce_alloc_end = *lprop;
 #endif
 
-#ifdef CONFIG_PPC_RTAS
-        /* To help early debugging via the front panel, we retrieve a minimal
-         * set of RTAS infos now if available
-         */
-        {
-                u64 *basep, *entryp, *sizep;
-
-                basep = of_get_flat_dt_prop(node, "linux,rtas-base", NULL);
-                entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL);
-                sizep = of_get_flat_dt_prop(node, "linux,rtas-size", NULL);
-                if (basep && entryp && sizep) {
-                        rtas.base = *basep;
-                        rtas.entry = *entryp;
-                        rtas.size = *sizep;
-                }
-        }
-#endif /* CONFIG_PPC_RTAS */
-
 #ifdef CONFIG_KEXEC
        lprop = (u64*)of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL);
        if (lprop)
@@ -1326,6 +1309,11 @@ void __init early_init_devtree(void *params)
         /* Setup flat device-tree pointer */
         initial_boot_params = params;
 
+#ifdef CONFIG_PPC_RTAS
+        /* Some machines might need RTAS info for debugging, grab it now. */
+        of_scan_flat_dt(early_init_dt_scan_rtas, NULL);
+#endif
+
         /* Retrieve various informations from the /chosen node of the
          * device-tree, including the platform type, initrd location and
          * size, TCE reserve, and more ...
@@ -2148,3 +2136,27 @@ struct device_node *of_get_cpu_node(int cpu, unsigned int *thread)
         }
         return NULL;
 }
+
+#ifdef DEBUG
+static struct debugfs_blob_wrapper flat_dt_blob;
+
+static int __init export_flat_device_tree(void)
+{
+        struct dentry *d;
+
+        d = debugfs_create_dir("powerpc", NULL);
+        if (!d)
+                return 1;
+
+        flat_dt_blob.data = initial_boot_params;
+        flat_dt_blob.size = initial_boot_params->totalsize;
+
+        d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
+                                d, &flat_dt_blob);
+        if (!d)
+                return 1;
+
+        return 0;
+}
+__initcall(export_flat_device_tree);
+#endif