[U-Boot] [PATCH 4/4] x86: baytrail: acpi: Hide internal UART per GNVS setting

[Bin Meng]

If global NVS says internal UART is not enabled, hide it in the ASL
code so that OS won't see it.

Signed-off-by: Bin Meng <bmeng.cn at gmail.com>

---

 arch/x86/include/asm/arch-baytrail/acpi/lpc.asl | 19 ++++++++-----------
 1 file changed, 8 insertions(+), 11 deletions(-)

diff --git a/arch/x86/include/asm/arch-baytrail/acpi/lpc.asl b/arch/x86/include/asm/arch-baytrail/acpi/lpc.asl
index 22f0d68..fe34d32 100644
--- a/arch/x86/include/asm/arch-baytrail/acpi/lpc.asl
+++ b/arch/x86/include/asm/arch-baytrail/acpi/lpc.asl
@@ -119,17 +119,14 @@ Device (LPCB)
 
 		Method(_STA, 0, Serialized)
 		{
-			/*
-			 * TODO:
-			 *
-			 * Need to hide the internal UART depending on whether
-			 * internal UART is enabled or not so that external
-			 * SuperIO UART can be exposed to system.
-			 */
-			Store(1, UI3E)
-			Store(1, UI4E)
-			Store(1, C1EN)
-			Return (STA_VISIBLE)
+			If (LEqual(IURE, 1)) {
+				Store(1, UI3E)
+				Store(1, UI4E)
+				Store(1, C1EN)
+				Return (STA_VISIBLE)
+			} Else {
+				Return (STA_MISSING)
+			}
 
 		}
 
-- 
2.7.4