pcduino3 is on openwrt official supported device list https://openwrt.org/toh/pcduino/pcduino3
pcduino3 nano spec也差不多，所以只需小改就可以完美使用

bring up

ethernet rtl8211e
openssl
openclash libcap/dnsmasq/luci-compat
nand flash H27UBG8T2BTR-BC

build process

clone code

1 2	git clone https://github.com/openwrt/openwrt.git git checkout v19.07.6

create a new device entry to build system

diff --git a/package/boot/uboot-sunxi/Makefile b/package/boot/uboot-sunxi/Makefile
index 6b83bd27c6..00101ad90c 100644
--- a/package/boot/uboot-sunxi/Makefile
+++ b/package/boot/uboot-sunxi/Makefile
@@ -126,6 +126,12 @@ define U-Boot/Linksprite_pcDuino3
   BUILD_DEVICES:=sun7i-a20-pcduino3
 endef
 
+define U-Boot/Linksprite_pcDuino3_Nano
+  BUILD_SUBTARGET:=cortexa7
+  NAME:=Linksprite pcDuino3 nano
+  BUILD_DEVICES:=sun7i-a20-pcduino3-nano
+endef
+
 define U-Boot/Lamobo_R1
   BUILD_SUBTARGET:=cortexa7
   NAME:=Lamobo R1
@@ -265,6 +271,7 @@ UBOOT_TARGETS := \
        OLIMEX_A13_SOM \
        Linksprite_pcDuino \
        Linksprite_pcDuino3 \
+       Linksprite_pcDuino3_Nano \
        Lamobo_R1 \
        nanopi_m1_plus \
        nanopi_neo \
diff --git a/target/linux/sunxi/image/cortex-a7.mk b/target/linux/sunxi/image/cortex-a7.mk
index ce0cbe5a5c..b0e5e9a28d 100644
--- a/target/linux/sunxi/image/cortex-a7.mk
+++ b/target/linux/sunxi/image/cortex-a7.mk
@@ -217,4 +217,13 @@ endef
 
 TARGET_DEVICES += sun7i-a20-pcduino3
 
+define Device/sun7i-a20-pcduino3-nano
+  DEVICE_TITLE:=LinkSprite pcDuino3 Nano
+  DEVICE_PACKAGES:=kmod-rtc-sunxi kmod-ata-core kmod-ata-sunxi kmod-usb-hid kmod-usb-net kmod-usb-net-asix
+  SUPPORTED_DEVICES:=linksprite,pcduino3-nano
+  SUNXI_DTS:=sun7i-a20-pcduino3-nano
+endef
+TARGET_DEVICES += sun7i-a20-pcduino3-nano
+
 endif

then config the kernel to make peripherals run properly

# add to target/linux/sunxi/config-4.14
CONFIG_GENERIC_IRQ_MIGRATION=y
# nand flash
CONFIG_MTD_NAND=y
CONFIG_MTD_NAND_ECC=y
CONFIG_MTD_NAND_SUNXI=y
# rtl8211e
CONFIG_REALTEK_PHY
# CONFIG_SPI_DYNAMIC is not set
# ax88772b usb to ethernet adaptor
CONFIG_USB_NET_AX8817X=y
CONFIG_USB_USBNET=y

replace with the master libcap https://github.com/vernesong/OpenClash/issues/839

1 2	rm -rf feeds/packages/libs/libcap svn co https://github.com/openwrt/packages/trunk/libs/libcap feeds/packages/libs/libcap

create dts patch to bring up nand flash target/linux/sunxi/patches-4.14/500-sun7i-a20-nand.patch

--- a/arch/arm/boot/dts/sun7i-a20-pcduino3-nano.dts
+++ b/arch/arm/boot/dts/sun7i-a20-pcduino3-nano.dts
@@ -232,3 +232,19 @@
        usb2_vbus-supply = <&reg_usb1_vbus>;
        status = "okay";
 };
+
+&nfc {
+       pinctrl-names = "default";
+       pinctrl-0 = <&nand_pins_a>, <&nand_cs0_pins_a>, <&nand_rb0_pins_a>;
+       status = "okay";
+
+       nand@0 {
+               #address-cells = <2>;
+               #size-cells = <2>;
+               reg = <0>;
+               allwinner,rb = <0>;
+
+               nand-ecc-mode = "hw";
+               nand-on-flash-bbt;
+       };
+};
--- a/arch/arm/boot/dts/sun7i-a20.dtsi
+++ b/arch/arm/boot/dts/sun7i-a20.dtsi
@@ -1322,6 +1322,45 @@
                                pins = "PI20", "PI21";
                                function = "uart7";
                        };
+
+                       nand_pins_a: nand_pins@0 {
+                           pins = "PC0", "PC1", "PC2",
+                                   "PC5", "PC8", "PC9", "PC10",
+                                   "PC11", "PC12", "PC13", "PC14",
+                                   "PC15", "PC16";
+                           function = "nand0";
+                       };
+
+                       nand_cs0_pins_a: nand_cs@0 {
+                           pins = "PC4";
+                           function = "nand0";
+                       };
+
+                       nand_cs1_pins_a: nand_cs@1 {
+                           pins = "PC3";
+                           function = "nand0";
+                       };
+
+                       nand_cs2_pins_a: nand_cs@2 {
+                           pins = "PC17";
+                           function = "nand0";
+                       };
+
+                       nand_cs3_pins_a: nand_cs@3 {
+                           pins = "PC18";
+                           function = "nand0";
+                       };
+
+                       nand_rb0_pins_a: nand_rb@0 {
+                           pins = "PC6";
+                           function = "nand0";
+                       };
+
+                       nand_rb1_pins_a: nand_rb@1 {
+                           pins = "PC7";
+                           function = "nand0";
+                       };
+
                };
                timer@01c20c00 {

compiling!!!
choose Target System (Allwinner A1x/A20/A3x) Subtarget (Allwinner A20/A3x) Target Profile (LinkSprite pcDuino3 Nano)

1	./scripts/feeds update -a && ./scripts/feeds install -a && make menuconfig && make download -j 16 && make -j1 V=s

nand flash might not work

[    0.970062] nand: Could not find valid ONFI parameter page; aborting   
[    0.976571] nand: device found, Manufacturer ID: 0xad, Chip ID: 0xd7                              
[    0.982942] nand: Hynix NAND 4GiB 3,3V 8-bit                                                      
[    0.987211] nand: 4096 MiB, MLC, erase size: 2048 KiB, page size: 4096, OOB size: 128             
[    0.995068] sunxi_nand 1c03000.nand: ECC init failed: -22                            
[    1.000463] sunxi_nand 1c03000.nand: failed to init nand chips      
[    1.006441] sunxi_nand: probe of 1c03000.nand failed with error -22

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pcduino3 nano 移植 openwrt 19.07.6

bring up

build process