POST cleanup.

- Revives POST for blackfin arch;
- Removes redundant code:
     arch/blackfin/lib/post.c
     arch/powerpc/cpu/ppc4xx/commproc.c
     arch/powerpc/cpu/mpc512x/common.c
- fixes up the post_word_{load|store} usage.

Signed-off-by: Michael Zaidman <michael.zaidman@gmail.com>
Acked-by: Detlev Zundel <dzu@denx.de>
Tested-by: Anatolij Gustschin <agust@denx.de>

List of the maintainers of the affected by patch boards:
Cc: Stephan Linz <linz@li-pro.net>
Cc: Denis Peter <d.peter@mpl.ch>
Cc: Matthias Fuchs <matthias.fuchs@esd-electronics.com>
Cc: Peter Tyser <ptyser@xes-inc.com>
Cc: Stefan Roese <sr@denx.de>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Niklaus Giger <niklaus.giger@netstal.com>
Cc: Larry Johnson <lrj@acm.org>
Cc: Feng Kan <fkan@amcc.com>
diff --git a/include/configs/hcu5.h b/include/configs/hcu5.h
index 26d2d0c..5adcc0f 100644
--- a/include/configs/hcu5.h
+++ b/include/configs/hcu5.h
@@ -86,7 +86,7 @@
 #define CONFIG_SYS_INIT_RAM_END	(4 << 10)
 #define CONFIG_SYS_GBL_DATA_SIZE	256		/* num bytes initial data */
 #define CONFIG_SYS_GBL_DATA_OFFSET	(CONFIG_SYS_INIT_RAM_END - CONFIG_SYS_GBL_DATA_SIZE)
-#define CONFIG_SYS_INIT_SP_OFFSET	CONFIG_SYS_POST_WORD_ADDR
+#define CONFIG_SYS_INIT_SP_OFFSET	(CONFIG_SYS_GBL_DATA_OFFSET - 0x4)
 
 /*-----------------------------------------------------------------------
  * Serial Port
@@ -212,9 +212,8 @@
 				 CONFIG_SYS_POST_FPU	   | \
 				 CONFIG_SYS_POST_ETHER	   | \
 				 CONFIG_SYS_POST_SPR)
-#define CONFIG_SYS_POST_UART_TABLE	{UART0_BASE}
 
-#define CONFIG_SYS_POST_WORD_ADDR	(CONFIG_SYS_GBL_DATA_OFFSET - 0x4)
+#define CONFIG_SYS_POST_UART_TABLE	{UART0_BASE}
 #define CONFIG_SYS_POST_CACHE_ADDR	0x7fff0000 /* free virtual address	*/
 #define CONFIG_SYS_CONSOLE_IS_IN_ENV /* Otherwise it catches logbuffer as output */