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From: Lucas Stach <l.stach@pengutronix.de>
To: barebox@lists.infradead.org
Subject: [PATCH 1/2] ARM: implement recommended WAR for errata 709718
Date: Thu,  6 Nov 2014 12:23:12 +0100	[thread overview]
Message-ID: <1415272993-29736-1-git-send-email-l.stach@pengutronix.de> (raw)

ARM Cortex A8 errata 709718:
"Load and store operations to shared device memory
regions may not complete in program order"

We implement the recommended workaround in the bootloader
as it must be applied before enabling the MMU for the
first time.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
---
 arch/arm/include/asm/errata.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/arm/include/asm/errata.h b/arch/arm/include/asm/errata.h
index e2ffd87360c0..9525823e4ca8 100644
--- a/arch/arm/include/asm/errata.h
+++ b/arch/arm/include/asm/errata.h
@@ -12,6 +12,18 @@
  * GNU General Public License for more details.
  */
 
+static inline void enable_arm_errata_709718_war(void)
+{
+	__asm__ __volatile__ (
+		"mrc	p15, 0, r0, c10, c2, 0\n"
+		"bic	r0, #3 << 16\n"
+		"mcr	p15, 0, r0, c10, c2, 0\n"
+		"mrc	p15, 0, r0, c1, c0, 0\n"
+		"orr	r0, r0, #1 << 28\n"
+		"mcr	p15, 0, r0, c1, c0, 0\n"
+	);
+}
+
 static inline void enable_arm_errata_716044_war(void)
 {
 	__asm__ __volatile__ (
-- 
2.1.1


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             reply	other threads:[~2014-11-06 11:23 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-11-06 11:23 Lucas Stach [this message]
2014-11-06 11:23 ` [PATCH 2/2] ARM: imx5: add imx5_cpu_lowlevel_init and use in all boards Lucas Stach
2014-11-11 13:51   ` Andreas Pretzsch
2014-11-11 14:01     ` Lucas Stach
2014-11-06 12:20 ` [PATCH 1/2] ARM: implement recommended WAR for errata 709718 Holger Schurig
2014-11-06 12:44   ` Lucas Stach
2014-11-06 12:46   ` Eric Bénard
2014-11-07  6:55 ` Sascha Hauer

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