From: Heiko Schocher <hs@denx.de>
Date: Thu, 12 Mar 2009 06:37:15 +0000 (+0100)
Subject: 8xx, icache: enabling ICache not before running from RAM
X-Git-Tag: v2009.03~12
X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=506f391888b82d1b83bdd749c3cea9eb2fd64df8;p=u-boot

8xx, icache: enabling ICache not before running from RAM

with the new CONFIG_SYS_DELAYED_ICACHE config option, ICache
is not enabled before code runs from RAM.

Signed-off-by: Heiko Schocher <hs@denx.de>
---

diff --git a/README b/README
index 43fb1c0d89..46181a4bcd 100644
--- a/README
+++ b/README
@@ -318,6 +318,11 @@ The following options need to be configured:
 		that this requires a (stable) reference clock (32 kHz
 		RTC clock or CONFIG_SYS_8XX_XIN)
 
+		CONFIG_SYS_DELAYED_ICACHE
+
+		Define this option if you want to enable the
+		ICache only when Code runs from RAM.
+
 - Intel Monahans options:
 		CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO
 
diff --git a/cpu/mpc8xx/start.S b/cpu/mpc8xx/start.S
index 45c902e7c6..8864c37cf6 100644
--- a/cpu/mpc8xx/start.S
+++ b/cpu/mpc8xx/start.S
@@ -142,7 +142,7 @@ boot_warm:
 	lis	r3, IDC_DISABLE@h	/* Disable data cache */
 	mtspr	DC_CST, r3
 
-#if !(defined(CONFIG_IP860) || defined(CONFIG_PCU_E) || defined (CONFIG_FLAGADM))
+#if !defined(CONFIG_SYS_DELAYED_ICACHE)
 					/* On IP860 and PCU E,
 					 * we cannot enable IC yet
 					 */
diff --git a/include/configs/FLAGADM.h b/include/configs/FLAGADM.h
index d8312384df..0f4277c4e3 100644
--- a/include/configs/FLAGADM.h
+++ b/include/configs/FLAGADM.h
@@ -173,6 +173,9 @@
 #if defined(CONFIG_CMD_KGDB)
 #define CONFIG_SYS_CACHELINE_SHIFT	4	/* log base 2 of the above value	*/
 #endif
+#define CONFIG_SYS_DELAYED_ICACHE	1	/* enable ICache not before
+						 * running in RAM.
+						 */
 
 /*-----------------------------------------------------------------------
  * SYPCR - System Protection Control				11-9
diff --git a/include/configs/IP860.h b/include/configs/IP860.h
index b9c57132d7..125aa6c802 100644
--- a/include/configs/IP860.h
+++ b/include/configs/IP860.h
@@ -209,6 +209,9 @@
 #if defined(CONFIG_CMD_KGDB)
 #define CONFIG_SYS_CACHELINE_SHIFT	4	/* log base 2 of the above value	*/
 #endif
+#define CONFIG_SYS_DELAYED_ICACHE	1	/* enable ICache not before
+						 * running in RAM.
+						 */
 
 /*-----------------------------------------------------------------------
  * SYPCR - System Protection Control				11-9
diff --git a/include/configs/pcu_e.h b/include/configs/pcu_e.h
index 921451927b..7c2bf1b0f4 100644
--- a/include/configs/pcu_e.h
+++ b/include/configs/pcu_e.h
@@ -246,6 +246,9 @@
  */
 #define CONFIG_SYS_CACHELINE_SIZE	16	/* For all MPC8xx CPUs			*/
 #define CONFIG_SYS_CACHELINE_SHIFT	4	/* log base 2 of the above value	*/
+#define CONFIG_SYS_DELAYED_ICACHE	1	/* enable ICache not before
+						 * running in RAM.
+						 */
 
 /*-----------------------------------------------------------------------
  * SYPCR - System Protection Control				11-9
diff --git a/lib_ppc/board.c b/lib_ppc/board.c
index 6d2930376e..f69c5f4f1f 100644
--- a/lib_ppc/board.c
+++ b/lib_ppc/board.c
@@ -736,8 +736,7 @@ void board_init_r (gd_t *id, ulong dest_addr)
 
 	WATCHDOG_RESET();
 
-#if defined(CONFIG_IP860) || defined(CONFIG_PCU_E) || \
-	defined (CONFIG_FLAGADM) || defined(CONFIG_MPC83XX)
+#if defined(CONFIG_SYS_DELAYED_ICACHE) || defined(CONFIG_MPC83XX)
 	icache_enable ();	/* it's time to enable the instruction cache */
 #endif