From 887a8b6ec287c20f802d5007081e7f5d615c51db Mon Sep 17 00:00:00 2001
From: Marek Vasut <marex@denx.de>
Date: Tue, 29 May 2018 16:16:46 +0200
Subject: [PATCH] ARM: socfpga: Assure correct ACTLR configuration
Make sure the ARM ACTLR register has correct configuration, otherwise
the Linux kernel refuses to boot. In particular, the "Write Full Line
of Zeroes" bit must be cleared.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chin Liang See <chin.liang.see@intel.com>
Cc: Dinh Nguyen <dinguyen@kernel.org>
---
arch/arm/mach-socfpga/board.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/arch/arm/mach-socfpga/board.c b/arch/arm/mach-socfpga/board.c
index 189e12a668..cb6530f7e8 100644
--- a/arch/arm/mach-socfpga/board.c
+++ b/arch/arm/mach-socfpga/board.c
@@ -18,7 +18,18 @@
DECLARE_GLOBAL_DATA_PTR;
-void s_init(void) {}
+void s_init(void) {
+ /*
+ * Preconfigure ACTLR, make sure Write Full Line of Zeroes is disabled.
+ * This is optional on CycloneV / ArriaV.
+ * This is mandatory on Arria10, otherwise Linux refuses to boot.
+ */
+ asm volatile(
+ "mcr p15, 0, %0, c1, c0, 1\n"
+ "isb\n"
+ "dsb\n"
+ ::"r"(0x0));
+}
/*
* Miscellaneous platform dependent initialisations
--
2.39.5