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 43fb1c0..46181a4 100644
--- a/README
+++ b/README
@@ -318,6 +318,11 @@
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 45c902e..8864c37 100644
--- a/cpu/mpc8xx/start.S
+++ b/cpu/mpc8xx/start.S
@@ -142,7 +142,7 @@
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 d831238..0f4277c 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 b9c5713..125aa6c 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 9214519..7c2bf1b 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 6d29303..f69c5f4 100644
--- a/lib_ppc/board.c
+++ b/lib_ppc/board.c
@@ -736,8 +736,7 @@
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