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From: Sascha Hauer <s.hauer@pengutronix.de>
To: barebox@lists.infradead.org
Subject: [PATCH 1/2] ARM startup: invalidate I-cache before jumping to relocated binary
Date: Wed, 23 May 2012 22:28:59 +0200	[thread overview]
Message-ID: <1337804940-9512-1-git-send-email-s.hauer@pengutronix.de> (raw)

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@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


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             reply	other threads:[~2012-05-23 20:29 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-05-23 20:28 Sascha Hauer [this message]
2012-05-23 20:29 ` [PATCH 2/2] ARM startup: Do call __mmu_cache_flush during startup Sascha Hauer

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