[U-Boot] [PATCH v2 2/2] x86: edison: Bring minimal ACPI support to the board

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

This board is based on Intel Tangier SoC (Intel Merrifield platform)
and may utilize ACPI powerfulness.

Bring minimum support by appending initial DSDT table for it.

Note, the addresses for generated tables are carefully chosen to avoid
any conflicts with existing shadowed BIOS data. The user have somewhat
like ~31 kB available for compiled ACPI tables that ought to be enough.

Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 board/intel/edison/.gitignore |  3 +++
 board/intel/edison/Kconfig    |  6 ++++++
 board/intel/edison/Makefile   |  1 +
 board/intel/edison/dsdt.asl   | 13 +++++++++++++
 include/configs/edison.h      |  3 +++
 5 files changed, 26 insertions(+)
 create mode 100644 board/intel/edison/.gitignore
 create mode 100644 board/intel/edison/dsdt.asl

diff --git a/board/intel/edison/.gitignore b/board/intel/edison/.gitignore
new file mode 100644
index 0000000000..6eb8a5481a
--- /dev/null
+++ b/board/intel/edison/.gitignore
@@ -0,0 +1,3 @@
+dsdt.aml
+dsdt.asl.tmp
+dsdt.c
diff --git a/board/intel/edison/Kconfig b/board/intel/edison/Kconfig
index 4ff9d5adec..ef9b14aa2b 100644
--- a/board/intel/edison/Kconfig
+++ b/board/intel/edison/Kconfig
@@ -15,6 +15,12 @@ config SYS_CONFIG_NAME
 config SYS_TEXT_BASE
 	default 0x01101000
 
+config ROM_TABLE_ADDR
+	default 0x0e4500
+
+config ROM_TABLE_SIZE
+	default 0x007b00
+
 config BOARD_SPECIFIC_OPTIONS # dummy
 	def_bool y
 	select X86_LOAD_FROM_32_BIT
diff --git a/board/intel/edison/Makefile b/board/intel/edison/Makefile
index dde159435b..eed8d65eb6 100644
--- a/board/intel/edison/Makefile
+++ b/board/intel/edison/Makefile
@@ -5,3 +5,4 @@
 #
 
 obj-y	+= start.o edison.o
+obj-$(CONFIG_GENERATE_ACPI_TABLE) += dsdt.o
diff --git a/board/intel/edison/dsdt.asl b/board/intel/edison/dsdt.asl
new file mode 100644
index 0000000000..d2e04730c9
--- /dev/null
+++ b/board/intel/edison/dsdt.asl
@@ -0,0 +1,13 @@
+/*
+ * Copyright (c) 2017 Intel Corporation
+ *
+ * Partially based on dsdt.asl for other x86 boards
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+DefinitionBlock("dsdt.aml", "DSDT", 2, "U-BOOT", "U-BOOTBL", 0x00010000)
+{
+	/* platform specific */
+	#include <asm/arch/acpi/platform.asl>
+}
diff --git a/include/configs/edison.h b/include/configs/edison.h
index d25b50c076..65d1660fc2 100644
--- a/include/configs/edison.h
+++ b/include/configs/edison.h
@@ -9,6 +9,9 @@
 
 #include <asm/ibmpc.h>
 
+/* ACPI */
+#define CONFIG_LAST_STAGE_INIT
+
 /* Boot */
 #define CONFIG_BOOTCOMMAND "run bootcmd"
 
-- 
2.14.2