[PATCH 1/2] ARM startup: invalidate I-cache before jumping to relocated binary

[Sascha Hauer]

barebox can startup with I-cache enabled, so to be on the safe
side we should invalidate the I-cache before jumping to a binary
we just copied in place.

Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
 arch/arm/cpu/start.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm/cpu/start.c b/arch/arm/cpu/start.c
index ede8fd1..0fcc950 100644
--- a/arch/arm/cpu/start.c
+++ b/arch/arm/cpu/start.c
@@ -135,6 +135,9 @@ void __naked __section(.text_ll_return) board_init_lowlevel_return(void)
 	/* clear bss */
 	memset(__bss_start, 0, __bss_stop - __bss_start);
 
+	/* flush I-cache before jumping to the copied binary */
+	__asm__ __volatile__("mcr p15, 0, %0, c7, c5, 0" : : "r" (0));
+
 	/* call start_barebox with its absolute address */
 	r = (unsigned int)&start_barebox;
 	__asm__ __volatile__("mov pc, %0" : : "r"(r));
-- 
1.7.10