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

@@ -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