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 <ma...@denx.de>
Cc: Chin Liang See <chin.liang....@intel.com>
Cc: Dinh Nguyen <dingu...@kernel.org>
---
NOTE: This gem was well hidden in the Altera U-Boot fork and is really needed.
What is not entirely clear to me is WHY ? So why is this needed ?
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..ffdabc04fc 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"(0x44));
+}
/*
* Miscellaneous platform dependent initialisations
--
2.17.0
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