[U-Boot] [PATCH] 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 --- arch/arm/lib/bootm.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/arm/lib/bootm.c b/arch/arm/lib/bootm.c index a8295bf..9782ddb 100644 --- a/arch/arm/lib/bootm.c +++ b/arch/arm/lib/bootm.c @@ -199,6 +199,7 @@ static void do_nonsec_virt_switch(void)
#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();
-----Original Messages----- From: "York Sun" yorksun@freescale.com Sent Time: 2014-04-01 05:40:32 (Tuesday) To: albert.u.boot@aribaud.net Cc: u-boot@lists.denx.de, "York Sun" yorksun@freescale.com Subject: [U-Boot] [PATCH] 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
arch/arm/lib/bootm.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/arm/lib/bootm.c b/arch/arm/lib/bootm.c index a8295bf..9782ddb 100644 --- a/arch/arm/lib/bootm.c +++ b/arch/arm/lib/bootm.c @@ -199,6 +199,7 @@ static void do_nonsec_virt_switch(void)
#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(); -- 1.7.9.5
fine!
Acked-by: David.Feng fenghua@phytium.com.cn
Hi York,
On Mon, 31 Mar 2014 14:40:32 -0700, York Sun yorksun@freescale.com wrote:
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
arch/arm/lib/bootm.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/arm/lib/bootm.c b/arch/arm/lib/bootm.c index a8295bf..9782ddb 100644 --- a/arch/arm/lib/bootm.c +++ b/arch/arm/lib/bootm.c @@ -199,6 +199,7 @@ static void do_nonsec_virt_switch(void)
#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();
Applied as a bugfix to u-boot-arm/master, thanks!
Amicalement,
participants (3)
-
Albert ARIBAUD -
FengHua -
York Sun