x86: qemu: Create separate i440fx and q35 device trees

Although the two qemu-x86 targets (i440fx and q35) share a lot in
common, they still have something that cannot easily handled in one
single device tree). Split to create two dedicated device tree files
and make the i440fx be the default build target.

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

arch/x86/dts/Makefile

@@ -3,7 +3,8 @@ dtb-y += chromebook_link.dtb \
 	crownbay.dtb \
 	galileo.dtb \
 	minnowmax.dtb \
-	qemu-x86.dtb
+	qemu-x86_i440fx.dtb \
+	qemu-x86_q35.dtb
 
 targets += $(dtb-y)
 

arch/x86/dts/qemu-x86_i440fx.dts

@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+/dts-v1/;
+
+/include/ "skeleton.dtsi"
+/include/ "serial.dtsi"
+
+/ {
+	model = "QEMU x86 (I440FX)";
+	compatible = "qemu,x86";
+
+	config {
+		silent_console = <0>;
+	};
+
+	chosen {
+		stdout-path = "/serial";
+	};
+
+	pci {
+		compatible = "pci-x86";
+		#address-cells = <3>;
+		#size-cells = <2>;
+		u-boot,dm-pre-reloc;
+		ranges = <0x02000000 0x0 0xc0000000 0xc0000000 0 0x10000000
+			0x42000000 0x0 0xd0000000 0xd0000000 0 0x10000000
+			0x01000000 0x0 0x2000 0x2000 0 0xe000>;
+	};
+
+};

arch/x86/dts/qemu-x86_q35.dts

@@ -10,7 +10,7 @@
 /include/ "serial.dtsi"
 
 / {
-	model = "QEMU x86";
+	model = "QEMU x86 (Q35)";
 	compatible = "qemu,x86";
 
 	config {

board/coreboot/coreboot/Kconfig

@@ -23,7 +23,7 @@ config SYS_CONFIG_NAME
 
 config DEFAULT_DEVICE_TREE
 	string "Board Device Tree Source (dts) file"
-	default "qemu-x86"
+	default "qemu-x86_i440fx"
 	help
 	  This option selects the board Device Tree Source (dts) file in
 	  arch/x86/dts/ directory to be used to build U-Boot for coreboot.

configs/qemu-x86_defconfig

@@ -1,10 +1,9 @@
 CONFIG_X86=y
 CONFIG_VENDOR_EMULATION=y
+CONFIG_DEFAULT_DEVICE_TREE="qemu-x86_i440fx"
 CONFIG_TARGET_QEMU_X86=y
 CONFIG_CMD_NET=y
 CONFIG_OF_CONTROL=y
-CONFIG_OF_SEPARATE=y
-CONFIG_DEFAULT_DEVICE_TREE="qemu-x86"
 CONFIG_VIDEO_VESA=y
 CONFIG_FRAMEBUFFER_SET_VESA_MODE=y
 CONFIG_FRAMEBUFFER_VESA_MODE_111=y

doc/README.x86

@@ -40,7 +40,7 @@ configuration during the 'make menuconfig' process.
 x86 architecture  --->
 	...
 	(qemu-x86) Board configuration file
-	(qemu-x86) Board Device Tree Source (dts) file
+	(qemu-x86_i440fx) Board Device Tree Source (dts) file
 	(0x01920000) Board specific Cache-As-RAM (CAR) address
 	(0x4000) Board specific Cache-As-RAM (CAR) size
 
@@ -186,6 +186,14 @@ To build u-boot.rom for QEMU x86 targets, just simply run
 $ make qemu-x86_defconfig
 $ make all
 
+Note this default configuration will build a U-Boot for the QEMU x86 i440FX
+board. To build a U-Boot against QEMU x86 Q35 board, you can change the build
+configuration during the 'make menuconfig' process like below:
+
+Device Tree Control  --->
+	...
+	(qemu-x86_q35) Default Device Tree for DT control
+
 Test with coreboot
 ------------------
 For testing U-Boot as the coreboot payload, there are things that need be paid