Merge branch 'next' of git://www.denx.de/git/u-boot-ppc4xx into next

2 files changed, 23 insertions, 13 deletions

diff --git a/arch/powerpc/cpu/ppc4xx/start.S b/arch/powerpc/cpu/ppc4xx/start.S
index 0e75794..2218508 100644
--- a/arch/powerpc/cpu/ppc4xx/start.S
+++ b/arch/powerpc/cpu/ppc4xx/start.S
@@ -48,21 +48,23 @@
  *-------------------------------------------------------------------------------
  */
 
-/*  U-Boot - Startup Code for AMCC 4xx PowerPC based Embedded Boards
- *
+/*
+ * Startup code for IBM/AMCC PowerPC 4xx (PPC4xx) based boards
  *
- *  The processor starts at 0xfffffffc and the code is executed
- *  from flash/rom.
- *  in memory, but as long we don't jump around before relocating.
- *  board_init lies at a quite high address and when the cpu has
- *  jumped there, everything is ok.
- *  This works because the cpu gives the FLASH (CS0) the whole
- *  address space at startup, and board_init lies as a echo of
- *  the flash somewhere up there in the memorymap.
+ * The following description only applies to the NOR flash style booting.
+ * NAND booting is different. For more details about NAND booting on 4xx
+ * take a look at doc/README.nand-boot-ppc440.
  *
- *  board_init will change CS0 to be positioned at the correct
- *  address and (s)dram will be positioned at address 0
+ * The CPU starts at address 0xfffffffc (last word in the address space).
+ * The U-Boot image therefore has to be located in the "upper" area of the
+ * flash (e.g. 512MiB - 0xfff80000 ... 0xffffffff). The default value for
+ * the boot chip-select (CS0) is quite big and covers this area. On the
+ * 405EX this is for example 0xffe00000 ... 0xffffffff. U-Boot will
+ * reconfigure this CS0 (and other chip-selects as well when configured
+ * this way) in the boot process to the "correct" values matching the
+ * board layout.
  */
+
 #include <asm-offsets.h>
 #include <config.h>
 #include <asm/ppc4xx.h>
@@ -265,7 +267,7 @@
 	/* NOTREACHED - board_init_f() does not return */
 #endif
 
-#if defined(CONFIG_SYS_RAMBOOT)
+#if defined(CONFIG_SYS_RAMBOOT) || defined(CONFIG_BOOT_FROM_XMD)
 	/*
 	 * 4xx RAM-booting U-Boot image is started from offset 0
 	 */
diff --git a/arch/powerpc/cpu/ppc4xx/u-boot.lds b/arch/powerpc/cpu/ppc4xx/u-boot.lds
index dac0e5b..842ff5f 100644
--- a/arch/powerpc/cpu/ppc4xx/u-boot.lds
+++ b/arch/powerpc/cpu/ppc4xx/u-boot.lds
@@ -23,8 +23,12 @@
 #include "config.h"	/* CONFIG_BOARDDIR */
 
 #ifndef RESET_VECTOR_ADDRESS
+#ifdef CONFIG_RESET_VECTOR_ADDRESS
+#define RESET_VECTOR_ADDRESS	CONFIG_RESET_VECTOR_ADDRESS
+#else
 #define RESET_VECTOR_ADDRESS	0xfffffffc
 #endif
+#endif
 
 OUTPUT_ARCH(powerpc)
 
@@ -100,7 +104,11 @@ SECTIONS
      * start.o, since the first shadow TLB only covers 4k
      * of address space.
      */
+#ifdef CONFIG_INIT_TLB
+    CONFIG_INIT_TLB (.bootpg)
+#else
     CONFIG_BOARDDIR/init.o	(.bootpg)
+#endif
   } :text = 0xffff
 #endif