armv8: Flush dcache before switching to EL2

For ARMv8, U-boot has been running at EL3 with cache and MMU enabled. Without proper setup for EL2, cache and MMU are both disabled (out of reset). Before switching, we need to flush the dcache to make sure the data is in the main memory. Signed-off-by: York Sun <yorksun@freescale.com> Acked-by: David.Feng <fenghua@phytium.com.cn>

armv8: Flush dcache before switching to EL2
For ARMv8, U-boot has been running at EL3 with cache and MMU enabled. Without proper setup for EL2, cache and MMU are both disabled (out of reset). Before switching, we need to flush the dcache to make sure the data is in the main memory. Signed-off-by: York Sun <yorksun@freescale.com> Acked-by: David.Feng <fenghua@phytium.com.cn>
York Sun · Albert ARIBAUD
1 parent 0883b0b58e
Showing 1 changed file with 1 additions and 0 deletions Side-by-side Diff
arch/arm/lib/bootm.c
@@ -199,6 +199,7 @@
  
 #ifdef CONFIG_ARM64
 	smp_kick_all_cpus();
+	flush_dcache_all();	/* flush cache before swtiching to EL2 */
 	armv8_switch_to_el2();
 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1
 	armv8_switch_to_el1();
...	...	@@ -199,6 +199,7 @@
199	199
200	200	#ifdef CONFIG_ARM64
201	201	smp_kick_all_cpus();
	202	+ flush_dcache_all(); /* flush cache before swtiching to EL2 */
202	203	armv8_switch_to_el2();
203	204	#ifdef CONFIG_ARMV8_SWITCH_TO_EL1
204	205	armv8_switch_to_el1();