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>

diff --git a/arch/arm/mach-socfpga/board.c b/arch/arm/mach-socfpga/board.c
index 189e12a668398c02de8380dbad7558b63e05d18e..cb6530f7e8feea57215940756b0a113ea6b5941c 100644 (file)
--- 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