[PATCH] flattened device tree changes

This patch updates the format of the flattened device-tree passed
between the boot trampoline and the kernel to support a more compact
representation, for use by embedded systems mostly.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 9 insertions, 5 deletions

diff --git a/include/asm-ppc64/prom.h b/include/asm-ppc64/prom.h
index 04b1a84f7ca3..dc5330b39509 100644
--- a/include/asm-ppc64/prom.h
+++ b/include/asm-ppc64/prom.h
@@ -22,13 +22,15 @@
 #define RELOC(x)        (*PTRRELOC(&(x)))
 
 /* Definitions used by the flattened device tree */
-#define OF_DT_HEADER            0xd00dfeed      /* 4: version, 4: total size */
-#define OF_DT_BEGIN_NODE        0x1             /* Start node: full name */
+#define OF_DT_HEADER            0xd00dfeed      /* marker */
+#define OF_DT_BEGIN_NODE        0x1             /* Start of node, full name */
 #define OF_DT_END_NODE          0x2             /* End node */
-#define OF_DT_PROP              0x3             /* Property: name off, size, content */
+#define OF_DT_PROP              0x3             /* Property: name off, size,
+                                                 * content */
+#define OF_DT_NOP               0x4             /* nop */
 #define OF_DT_END               0x9
 
-#define OF_DT_VERSION           1
+#define OF_DT_VERSION           0x10
 
 /*
  * This is what gets passed to the kernel by prom_init or kexec
@@ -54,7 +56,9 @@ struct boot_param_header
         u32     version;                /* format version */
         u32     last_comp_version;      /* last compatible version */
         /* version 2 fields below */
-        u32     boot_cpuid_phys;        /* Which physical CPU id we're booting on */
+        u32     boot_cpuid_phys;        /* Physical CPU id we're booting on */
+        /* version 3 fields below */
+        u32     dt_strings_size;        /* size of the DT strings block */
 };