configs/friendlyarm_nanopi_r2s: new defconfig

The NanoPi R2S is a FriendlyElec mini-router based on:

- Rockchip RK3328 SoC
- 1GB (or 2GB) DDR4 RAM
- Gigabit Ethernet (WAN)
- Gigabit Ethernet (USB3) (LAN)
- USB 2.0 Host Port
- MicroSD slot
- Reset button
- WAN - LAN - SYS LED

https://www.friendlyarm.com/index.php?route=product/product&path=69&product_id=282

Signed-off-by: Gilles Talis <gilles.talis@gmail.com>
[Arnout:
 - explicitly set BR2_cortex_a53=y;
 - remove unused mtools and dosfstools;
 - add BR2_TARGET_UBOOT_NEEDS_PYLIBFDT=y;
]
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

DEVELOPERS

@@ -1068,7 +1068,9 @@ F:	configs/qemu_*
 
 N:	Gilles Talis <gilles.talis@gmail.com>
 F:	board/freescale/imx8mmevk/
+F:	board/friendlyarm/nanopi-r2s/
 F:	configs/freescale_imx8mmevk_defconfig
+F:	configs/friendlyarm_nanopi_r2s_defconfig
 F:	package/cctz/
 F:	package/faad2/
 F:	package/fdk-aac/

board/friendlyarm/nanopi-r2s/extlinux.conf

@@ -0,0 +1,4 @@
+label NanoPi R2S linux
+  kernel /boot/Image
+  devicetree /boot/rk3328-nanopi-r2s.dtb
+  append root=/dev/mmcblk0p1 rw rootwait

board/friendlyarm/nanopi-r2s/genimage.cfg

@@ -0,0 +1,22 @@
+image sdcard.img {
+	hdimage {
+	}
+
+	partition u-boot-tpl-spl-dtb {
+		in-partition-table = "no"
+		image = "idbloader.img"
+		offset = 32K
+	}
+
+	partition u-boot-dtb {
+		in-partition-table = "no"
+		image = "u-boot.itb"
+		offset = 8M
+	}
+
+	partition rootfs {
+		partition-type = 0x83
+		offset = 16M
+		image = "rootfs.ext4"
+	}
+}

board/friendlyarm/nanopi-r2s/post-build.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+
+BOARD_DIR="$(dirname $0)"
+
+install -m 0644 -D $BOARD_DIR/extlinux.conf $TARGET_DIR/boot/extlinux/extlinux.conf

board/friendlyarm/nanopi-r2s/readme.txt

@@ -0,0 +1,57 @@
+Intro
+=====
+
+This default configuration will allow you to start experimenting with the
+buildroot environment for the Nanopi R2S. With the current configuration
+it will bring-up the board, and allow access through the serial console.
+
+Nanopi R2S link:
+https://www.friendlyarm.com/index.php?route=product/product&path=69&product_id=282
+
+This configuration uses ATF, U-Boot mainline and kernel mainline.
+
+How to build
+============
+
+    $ make friendlyarm_nanopi_r2s_defconfig
+    $ make
+
+Note: you will need access to the internet to download the required
+sources.
+
+Files created in output directory
+=================================
+
+output/images
+
+├── bl31.elf
+├── boot.vfat
+├── extlinux
+├── idbloader.img
+├── Image
+├── rk3328-nanopi-r2s.dtb
+├── rootfs.ext2
+├── rootfs.ext4 -> rootfs.ext2
+├── rootfs.tar
+├── sdcard.img
+├── u-boot.bin
+└── u-boot.itb
+
+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
+  $ sudo sync
+
+Insert the micro SDcard in your Nanopi R2S and power it up. The console
+is on the serial line, 1500000 8N1.
+
+Notes
+=====
+
+This configuration can also be used to drive the Friendlyarm Nanopi Neo3 board.

configs/friendlyarm_nanopi_r2s_defconfig

@@ -0,0 +1,40 @@
+BR2_aarch64=y
+BR2_cortex_a53=y
+BR2_ARM_FPU_VFPV4=y
+BR2_TARGET_GENERIC_HOSTNAME="rk3328-nanopi-r2s"
+BR2_TARGET_GENERIC_ISSUE="Welcome to Nanopi R2S RK3328"
+BR2_ROOTFS_POST_BUILD_SCRIPT="board/friendlyarm/nanopi-r2s/post-build.sh"
+BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"
+BR2_ROOTFS_POST_SCRIPT_ARGS="-c board/friendlyarm/nanopi-r2s/genimage.cfg"
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.16"
+BR2_LINUX_KERNEL_USE_ARCH_DEFAULT_CONFIG=y
+BR2_LINUX_KERNEL_DTS_SUPPORT=y
+BR2_LINUX_KERNEL_INTREE_DTS_NAME="rockchip/rk3328-nanopi-r2s"
+BR2_LINUX_KERNEL_INSTALL_TARGET=y
+BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
+BR2_TARGET_ROOTFS_EXT2=y
+BR2_TARGET_ROOTFS_EXT2_4=y
+BR2_TARGET_ROOTFS_EXT2_SIZE="120M"
+BR2_TARGET_ARM_TRUSTED_FIRMWARE=y
+BR2_TARGET_ARM_TRUSTED_FIRMWARE_CUSTOM_VERSION=y
+BR2_TARGET_ARM_TRUSTED_FIRMWARE_CUSTOM_VERSION_VALUE="v2.5"
+BR2_TARGET_ARM_TRUSTED_FIRMWARE_PLATFORM="rk3328"
+BR2_TARGET_ARM_TRUSTED_FIRMWARE_IMAGES=""
+BR2_TARGET_ARM_TRUSTED_FIRMWARE_NEEDS_ARM32_TOOLCHAIN=y
+BR2_TARGET_UBOOT=y
+BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG=y
+BR2_TARGET_UBOOT_CUSTOM_VERSION=y
+BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2021.10"
+BR2_TARGET_UBOOT_BOARD_DEFCONFIG="nanopi-r2s-rk3328"
+BR2_TARGET_UBOOT_NEEDS_DTC=y
+BR2_TARGET_UBOOT_NEEDS_PYLIBFDT=y
+BR2_TARGET_UBOOT_NEEDS_ATF_BL31=y
+BR2_TARGET_UBOOT_NEEDS_ATF_BL31_ELF=y
+BR2_TARGET_UBOOT_FORMAT_CUSTOM=y
+BR2_TARGET_UBOOT_FORMAT_CUSTOM_NAME="u-boot.itb"
+BR2_TARGET_UBOOT_SPL=y
+BR2_TARGET_UBOOT_SPL_NAME="idbloader.img"
+BR2_PACKAGE_HOST_GENIMAGE=y
+BR2_PACKAGE_HOST_UBOOT_TOOLS=y