x86: galileo: Enable ACPI table generation

Enable ACPI table generation by creating a DSDT table.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

board/intel/galileo/.gitignore

@@ -0,0 +1,3 @@
+dsdt.aml
+dsdt.asl.tmp
+dsdt.c

board/intel/galileo/Makefile

@@ -5,3 +5,4 @@
 #
 
 obj-y	+= galileo.o start.o
+obj-$(CONFIG_GENERATE_ACPI_TABLE) += dsdt.o

board/intel/galileo/acpi/mainboard.asl

@@ -0,0 +1,11 @@
+/*
+ * Copyright (C) 2016, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+/* Power Button */
+Device (PWRB)
+{
+	Name(_HID, EISAID("PNP0C0C"))
+}

board/intel/galileo/dsdt.asl

@@ -0,0 +1,14 @@
+/*
+ * Copyright (C) 2016, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+DefinitionBlock("dsdt.aml", "DSDT", 2, "U-BOOT", "U-BOOTBL", 0x00010000)
+{
+	/* platform specific */
+	#include <asm/arch/acpi/platform.asl>
+
+	/* board specific */
+	#include "acpi/mainboard.asl"
+}

configs/galileo_defconfig

@@ -5,6 +5,7 @@ CONFIG_TARGET_GALILEO=y
 CONFIG_ENABLE_MRC_CACHE=y
 CONFIG_GENERATE_PIRQ_TABLE=y
 CONFIG_GENERATE_MP_TABLE=y
+CONFIG_GENERATE_ACPI_TABLE=y
 CONFIG_FIT=y
 CONFIG_BOOTSTAGE=y
 CONFIG_BOOTSTAGE_REPORT=y

doc/README.x86

@@ -1028,12 +1028,15 @@ Features that are optional:
    those legacy stuff into U-Boot. ACPI spec allows a system that does not
    support SMI (a legacy-free system).
 
-So far ACPI is enabled on BayTrail based boards. Testing was done by booting
+ACPI was initially enabled on BayTrail based boards. Testing was done by booting
 a pre-installed Ubuntu 14.04 from a SATA drive. Installing Ubuntu 14.04 and
 Windows 8.1/10 to a SATA drive and booting from there is also tested. Most
 devices seem to work correctly and the board can respond a reboot/shutdown
 command from the OS.
 
+For other platform boards, ACPI support status can be checked by examining their
+board defconfig files to see if CONFIG_GENERATE_ACPI_TABLE is set to y.
+
 TODO List
 ---------
 - Audio