libpayload: Reintroduce CONFIG_LP_CHROMEOS to set suitable defaults

Chrome OS builds always have some inherent differences to "standard"
libpayload configurations: they don't want to use curses or things like
storage drivers, they always use the coreboot framebuffer and USB, etc.
This patch reintroduces CONFIG_LP_CHROMEOS as an option that only
affects Kconfig defaults. This allows Chrome OS builds to select most of
what they need in one go and reduces board-specific .config files to
only the options that are really specific to that board.

Also restricts the 8250_SERIAL_CONSOLE Kconfig to only default to yes on
x86 boards, which probably makes sense for all of libpayload (some but
far from all ARM boards use 8250-compatible UARTs, and we should
probably not default a platform option unless it's going to be correct
with very high probability).

BRANCH=None
BUG=None
TEST=Built and booted Jerry and Oak.

Change-Id: Ie0c0593ffd399608d2cbfb83d20891f6f1864914
Signed-off-by: Julius Werner <jwerner@chromium.org>
Original-Commit-Id: e558f59
Original-Change-Id: I609637cd2ea7dfb4558aa3c04c90b64038c9ab57
Original-Signed-off-by: Julius Werner <jwerner@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/347970
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/17024
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

payloads/libpayload/Kconfig

@@ -34,6 +34,7 @@ menu "Generic Options"
 
 config GPL
 	bool "GPLv2-licensed Options"
+	default y if CHROMEOS
 	default n
 	help
 	  Prompt for options that will build code licensed under the GNU General
@@ -55,6 +56,12 @@ config DEVELOPER
 	  Prompt for developer options. These options are only interesting for
 	  libpayload developers.
 
+config CHROMEOS
+	bool "Chrome OS Options"
+	default n
+	help
+	  Select configuration defaults appropriate for Chrome OS boards.
+
 choice
 	prompt "Compiler to use"
 	default COMPILER_GCC
@@ -117,7 +124,7 @@ endchoice
 config MULTIBOOT
 	bool "Multiboot header support"
 	depends on ARCH_X86
-	default y
+	default y if !CHROMEOS
 
 config HEAP_SIZE
 	int "Heap size"
@@ -158,7 +165,7 @@ config LIBC
 
 config CURSES
 	bool "Build a curses library"
-	default y
+	default y if !CHROMEOS
 
 choice
 	prompt "Curses implementation"
@@ -208,6 +215,7 @@ menu "Console Options"
 
 config SKIP_CONSOLE_INIT
 	bool "Skip initializing the consoles at startup"
+	default y if CHROMEOS
 	default n
 	help
 	  Normally, libpayload will initialize console input/output on startup
@@ -225,7 +233,7 @@ config SERIAL_CONSOLE
 config 8250_SERIAL_CONSOLE
 	bool "8250-compatible serial port driver (including IO and MMIO)"
 	depends on SERIAL_CONSOLE
-	default y
+	default y if ARCH_X86
 
 config S5P_SERIAL_CONSOLE
 	bool "Exynos SOC, S5P compatible serial port driver"
@@ -289,7 +297,7 @@ config VIDEO_CONSOLE
 config VGA_VIDEO_CONSOLE
 	bool "VGA video console driver"
 	depends on ARCH_X86 && VIDEO_CONSOLE
-	default y
+	default y if !CHROMEOS
 
 config GEODELX_VIDEO_CONSOLE
 	bool "Geode LX video console driver"
@@ -299,6 +307,7 @@ config GEODELX_VIDEO_CONSOLE
 config COREBOOT_VIDEO_CONSOLE
 	bool "coreboot video console driver"
 	depends on VIDEO_CONSOLE && !GEODELX_VIDEO_CONSOLE
+	default y if CHROMEOS
 	default n
 	help
 	  Say Y here if coreboot switched to a graphics mode and
@@ -352,7 +361,7 @@ config RTC_PORT_EXTENDED_VIA
 config SPEAKER
 	bool "Support for PC speaker"
 	depends on ARCH_X86
-	default y
+	default y if !CHROMEOS
 
 source "drivers/timer/Kconfig"
 source "drivers/storage/Kconfig"

payloads/libpayload/drivers/storage/Kconfig

@@ -12,7 +12,7 @@
 
 config STORAGE
 	bool "Support for storage devices"
-	default y
+	default y if !CHROMEOS
 	help
 	  Select this option if you want support for storage devices (like
 	  hard drives, memory sticks or optical drives).

payloads/libpayload/drivers/usb/Kconfig

@@ -18,7 +18,7 @@ config USB
 config USB_UHCI
 	bool "Support for USB UHCI controllers"
 	depends on USB && ARCH_X86
-	default y
+	default y if !CHROMEOS
 	help
 	  Select this option if you are going to use USB 1.1 on an Intel based
 	  system.
@@ -26,7 +26,7 @@ config USB_UHCI
 config USB_OHCI
 	bool "Support for USB OHCI controllers"
 	depends on USB
-	default y
+	default y if !CHROMEOS
 	help
 	  Select this option if you are going to use USB 1.1 on a non-Intel based
 	  system.
@@ -34,14 +34,14 @@ config USB_OHCI
 config USB_EHCI
 	bool "Support for USB EHCI controllers"
 	depends on USB
-	default y
+	default y if !CHROMEOS
 	help
 	  Select this option if you want to use USB 2.0
 
 config USB_XHCI
 	bool "Support for USB xHCI controllers"
 	depends on USB
-	default y
+	default y if !CHROMEOS
 	help
 	  Select this option if you want to use USB 3.0