rockchip: add NanoPi R2S support

Hardware
--------
RockChip RK3328 ARM64 (4 cores)
1GB DDR4 RAM
2x 1000 Base-T
3 LEDs (LAN / WAN / SYS)
1 Button (Reset)
Micro-SD slot
USB 2.0 Port

Installation
------------
Uncompress the OpenWrt sysupgrade and write it to a micro SD card using
dd.

MAC-address
-----------
The vendor code supports reading a MAC address from an EEPROM connected
via i2c0 of the SoC. The EEPROM (address 0x51) should contain the MAC
address in binary at offset 0xfa. However, my two units didn't come with
such an EEPROM soldered on. The EEPROM should be placed between the SoC
and the GPIO pins on the board. (U10)

Generating rendom MAC addresses works around this issue. Otherwise, all
boards running the same image have identical MAC addresses.

Signed-off-by: David Bauer <mail@david-bauer.net>

target/linux/rockchip/image/armv8.mk

@@ -4,6 +4,17 @@
 # This is free software, licensed under the GNU General Public License v2.
 # See /LICENSE for more information.
 #
+
+define Device/friendlyarm_nanopi-r2s
+  DEVICE_VENDOR := FriendlyARM
+  DEVICE_MODEL := NanoPi R2S
+  SOC := rk3328
+  UBOOT_DEVICE_NAME := nanopi-r2s-rk3328
+  IMAGE/sysupgrade.img.gz := boot-common | boot-script nanopi-r2s | pine64-img | gzip | append-metadata
+  DEVICE_PACKAGES := kmod-usb-net kmod-usb-net-rtl8152
+endef
+TARGET_DEVICES += friendlyarm_nanopi-r2s
+
 define Device/pine64_rockpro64
   DEVICE_VENDOR := Pine64
   DEVICE_MODEL := RockPro64

target/linux/rockchip/image/nanopi-r2s.bootscript

@@ -0,0 +1,8 @@
+part uuid mmc ${devnum}:2 uuid
+
+setenv bootargs "console=ttyS2,1500000 earlycon=uart8250,mmio32,0xff130000 root=PARTUUID=${uuid} rw rootwait"
+
+load mmc ${devnum}:1 ${fdt_addr_r} rockchip.dtb
+load mmc ${devnum}:1 ${kernel_addr_r} kernel.img
+
+booti ${kernel_addr_r} - ${fdt_addr_r}