orangepi: add basic support for orangepi-zero board

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+setenv fdt_high ffffffff
+
+setenv bootargs console=ttyS0,115200 earlyprintk root=/dev/mmcblk0p2 rootwait
+
+fatload mmc 0 $kernel_addr_r zImage
+fatload mmc 0 $fdt_addr_r sun8i-h2-plus-orangepi-zero.dtb
+
+bootz $kernel_addr_r - $fdt_addr_r

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+# Minimal SD card image for the OrangePi PC
+#
+image boot.vfat {
+	vfat {
+		files = {
+			"zImage",
+			"sun8i-h2-plus-orangepi-zero.dtb",
+			"boot.scr"
+		}
+	}
+	size = 10M
+}
+
+image sdcard.img {
+	hdimage {
+	}
+
+	partition u-boot {
+		in-partition-table = "no"
+		image = "u-boot-sunxi-with-spl.bin"
+		offset = 8192
+		size = 1040384 # 1MB - 8192
+	}
+
+	partition boot {
+		partition-type = 0xC
+		bootable = "true"
+		image = "boot.vfat"
+	}
+
+	partition rootfs {
+		partition-type = 0x83
+		image = "rootfs.ext4"
+		size = 512M
+	}
+}

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+# spidev
+CONFIG_SPI_SPIDEV=y
+
+# spi nor
+CONFIG_MTD=y
+CONFIG_MTD_OF_PARTS=y
+CONFIG_MTD_SPI_NOR=y
+CONFIG_MTD_M25P80=y
+
+# wireless core
+CONFIG_WIRELESS=y
+CONFIG_CFG80211=y
+CONFIG_MAC80211=y
+CONFIG_CFG80211_WEXT=y
+
+# wireless drivers
+CONFIG_WLAN=y

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+From d06068f474e029bbde7348108c509cc63d6aa196 Mon Sep 17 00:00:00 2001
+From: Sergey Matyukevich <[email protected]>
+Date: Fri, 19 May 2017 23:39:48 +0300
+Subject: [PATCH 1/2] ARM: dts: orange-pi-zero: interrupt triggering for XR819
+ WiFi chip
+
+Specify interrupt triggering for XR819 SDIO WiFi chip
+on orange-pi-zero board.
+
+For more details see: http://linux-sunxi.org/Wifi#Allwinner
+
+Signed-off-by: Sergey Matyukevich <[email protected]>
+---
+ arch/arm/boot/dts/sun8i-h2-plus-orangepi-zero.dts | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/arch/arm/boot/dts/sun8i-h2-plus-orangepi-zero.dts b/arch/arm/boot/dts/sun8i-h2-plus-orangepi-zero.dts
+index b7ca916d871d..6510d22deed3 100644
+--- a/arch/arm/boot/dts/sun8i-h2-plus-orangepi-zero.dts
++++ b/arch/arm/boot/dts/sun8i-h2-plus-orangepi-zero.dts
+@@ -125,6 +125,8 @@
+ 	 */
+ 	xr819: sdio_wifi at 1 {
+ 		reg = <1>;
++		interrupt-parent = <&pio>;
++		interrupts = <6 10 IRQ_TYPE_EDGE_RISING>;
+ 	};
+ };
+ 
+-- 
+2.11.0
+

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+../post-build.sh
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+../post-image.sh
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+OrangePi Zero
+
+Intro
+=====
+
+This default configuration will allow you to start experimenting with the
+buildroot environment for the OrangePi Zero. With the current configuration
+it will bring-up the board, and allow access through the serial console.
+
+How to build it
+===============
+
+Configure Buildroot:
+
+    $ make orangepi_zero_defconfig
+
+Compile everything and build the SD card image:
+
+    $ make
+
+How to write the SD card
+========================
+
+Once the build process is finished you will have an image called "sdcard.img"
+in the output/images/ directory.
+
+Copy the bootable "sdcard.img" onto an SD card with "dd":
+
+  $ sudo dd if=output/images/sdcard.img of=/dev/sdX

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