rockchip: add support for rk3288 PopMetal board

PopMetal is a rockchip rk3288 based board made by ChipSpark, which has
many interface such as HDMI, VGA, USB, micro-SD card, WiFi, Audio and
Gigabit Ethernet.

Signed-off-by: Ziyuan Xu <xzy.xu@rock-chips.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/mach-rockchip/rk3288/Kconfig b/arch/arm/mach-rockchip/rk3288/Kconfig
index 4bfd78b..8ec1920 100644
--- a/arch/arm/mach-rockchip/rk3288/Kconfig
+++ b/arch/arm/mach-rockchip/rk3288/Kconfig
@@ -24,6 +24,15 @@
 	  includes on-board eMMC and 2GB of SDRAM. Expansion connectors
 	  provide access to display pins, I2C, SPI, UART and GPIOs.
 
+config TARGET_POPMETAL_RK3288
+	bool "PopMetal-RK3288"
+	help
+	  PopMetal is a RK3288-based development board with 3 USB host ports,
+	  1 micro USB OTG port, HDMI, VGA, micro-SD card, audio, WiFi, Gigabit
+	  Ethernet and lots of sensors. It also includes on-board 8 GeMMC and
+	  2GB DDR3. Expansion connectors provide access to I2C, SPI, UART,
+	  GPIOs and display interface.
+
 config TARGET_CHROMEBOOK_JERRY
 	bool "Google/Rockchip Veyron-Jerry Chromebook"
 	help
@@ -65,4 +74,6 @@
 
 source "board/rockchip/fennec_rk3288/Kconfig"
 
+source "board/chipspark/popmetal_rk3288/Kconfig"
+
 endif