ppc4xx: Flush complete dcache in relocate_code()

When the cache is enabled in SDRAM we need to flush not only the global
data area but also the bd_info struct in relocate_code. This patch now
flushed the complete dcache (all dcache lines) via flush_dcache() instead
of adding a flush_dcache_range() call for bd_info since this is faster.
Signed-off-by: NStefan Roese <sr@denx.de>

arch/powerpc/cpu/ppc4xx/start.S

@@ -1389,8 +1389,8 @@ in32r:
 relocate_code:
 #if defined(CONFIG_4xx_DCACHE) || defined(CONFIG_SYS_INIT_DCACHE_CS)
 	/*
-	 * We need to flush the initial global data (gd_t) before the dcache
-	 * will be invalidated.
+	 * We need to flush the initial global data (gd_t) and bd_info
+	 * before the dcache will be invalidated.
 	 */
 
 	/* Save registers */
@@ -1398,10 +1398,11 @@ relocate_code:
 	mr	r10, r4
 	mr	r11, r5
 
-	/* Flush initial global data range */
-	mr	r3, r4
-	addi	r4, r4, GENERATED_GBL_DATA_SIZE@l
-	bl	flush_dcache_range
+	/*
+	 * Flush complete dcache, this is faster than flushing the
+	 * ranges for global_data and bd_info instead.
+	 */
+	bl	flush_dcache
 
 #if defined(CONFIG_SYS_INIT_DCACHE_CS)
 	/*