Blackfin: post: setup default CONFIG_SYS_POST_WORD_ADDR

Set the default post word location to an L1 data location for all
Blackfin parts so things "just work" for most people.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/arch/blackfin/include/asm/config.h b/arch/blackfin/include/asm/config.h
index 89814cd..bc3c252 100644
--- a/arch/blackfin/include/asm/config.h
+++ b/arch/blackfin/include/asm/config.h
@@ -121,6 +121,9 @@
 #ifndef CONFIG_SYS_MEMTEST_END
 # define CONFIG_SYS_MEMTEST_END (CONFIG_STACKBASE - 8192 + 4)
 #endif
+#ifndef CONFIG_SYS_POST_WORD_ADDR
+# define CONFIG_SYS_POST_WORD_ADDR (L1_DATA_B_SRAM + L1_DATA_B_SRAM_SIZE - 4)
+#endif
 
 /* Check to make sure everything fits in external RAM */
 #if CONFIG_SYS_MAX_RAM_SIZE && \