From: nitin.garg at freescale.com <nitin.garg@freescale.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH v3 2/3] ARM: Add workaround for Cortex-A9 errata 845369
Date: Mon, 6 Apr 2015 14:01:09 -0500 [thread overview]
Message-ID: <1428346870-15227-2-git-send-email-nitin.garg@freescale.com> (raw)
In-Reply-To: <1428346870-15227-1-git-send-email-nitin.garg@freescale.com>
From: Nitin Garg <nitin.garg@freescale.com>
Under very rare timing circumstances, transition into
streaming mode might create a data corruption. Exists on
all Cortex-A9 revisions.
Signed-off-by: Nitin Garg <nitin.garg@freescale.com>
---
Changes in v3: None
Changes in v2: None
README | 1 +
arch/arm/cpu/armv7/start.S | 5 +++++
2 files changed, 6 insertions(+)
diff --git a/README b/README
index b7c2a17..8976041 100644
--- a/README
+++ b/README
@@ -683,6 +683,7 @@ The following options need to be configured:
CONFIG_ARM_ERRATA_751472
CONFIG_ARM_ERRATA_794072
CONFIG_ARM_ERRATA_761320
+ CONFIG_ARM_ERRATA_845369
If set, the workarounds for these ARM errata are applied early
during U-Boot startup. Note that these options force the
diff --git a/arch/arm/cpu/armv7/start.S b/arch/arm/cpu/armv7/start.S
index 5ed0f45..db77adb 100644
--- a/arch/arm/cpu/armv7/start.S
+++ b/arch/arm/cpu/armv7/start.S
@@ -164,6 +164,11 @@ ENTRY(cpu_init_cp15)
orr r0, r0, #1 << 21 @ set bit #21
mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register
#endif
+#ifdef CONFIG_ARM_ERRATA_845369
+ mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register
+ orr r0, r0, #1 << 22 @ set bit #22
+ mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register
+#endif
mov r5, lr @ Store my Caller
mrc p15, 0, r1, c0, c0, 0 @ r1 has Read Main ID Register (MIDR)
--
1.7.9.5
next prev parent reply other threads:[~2015-04-06 19:01 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-06 19:01 [U-Boot] [PATCH v3 1/3] ARM: mx6: Fix errata workarounds for i.MX6 nitin.garg at freescale.com
2015-04-06 19:01 ` nitin.garg at freescale.com [this message]
2015-04-06 19:01 ` [U-Boot] [PATCH v3 3/3] ARM: mx6: Enable ARM errata workaround for 845369 nitin.garg at freescale.com
2015-04-06 23:33 ` [U-Boot] [PATCH v3 1/3] ARM: mx6: Fix errata workarounds for i.MX6 Troy Kisky
2015-04-08 9:04 ` Stefano Babic
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