configs/nanopi_m4: new defconfig

This initial support includes:
	Custom u-boot
	Linux v5.1
	ATF v2.0
	Buildroot default packages

Tested-by: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Shyam Saini <shyam.saini@amarulasolutions.com>
[Thomas:
 - Use BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_1
 - Use final 5.1 kernel
 - Use default ext2 filesystem]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

.gitlab-ci.yml

@@ -213,6 +213,7 @@ mx6udoo_defconfig: { extends: .defconfig }
 nanopc_t4_defconfig: { extends: .defconfig }
 nanopi_m1_defconfig: { extends: .defconfig }
 nanopi_m1_plus_defconfig: { extends: .defconfig }
+nanopi_m4_defconfig: {extends: .defconfig}
 nanopi_neo_defconfig: { extends: .defconfig }
 nanopi_neo4_defconfig: { extends: .defconfig }
 nexbox_a95x_defconfig: { extends: .defconfig }

DEVELOPERS

@@ -2064,11 +2064,13 @@ F:	package/ubus/
 F:	package/wolfssl/
 
 N:	Shyam Saini <shyam.saini@amarulasolutions.com>
+F:	board/friendlyarm/nanopi-m4/
 F:	board/friendlyarm/nanopi-neo4/
 F:	board/friendlyarm/nanopc-t4/
 F:	board/olimex/a33_olinuxino/
 F:	board/radxa/rock-pi4/
 F:	board/pine64/rockpro64/
+F:	configs/nanopi_m4_defconfig
 F:	configs/nanopi_neo4_defconfig
 F:	configs/nanopc_t4_defconfig
 F:	configs/olimex_a33_olinuxino_defconfig

board/friendlyarm/nanopi-m4/extlinux.conf

@@ -0,0 +1,4 @@
+label NanoPi M4 5.1-rc1
+  kernel /boot/Image
+  devicetree /boot/rk3399-nanopi-m4.dtb
+  append earlycon=uart8250,mmio32,0xff1a0000 root=/dev/mmcblk1p1 rootwait

board/friendlyarm/nanopi-m4/genimage.cfg

@@ -0,0 +1,22 @@
+image sdcard.img {
+	hdimage {
+	}
+
+	partition u-boot-spl-dtb {
+		in-partition-table = "no"
+		image = "u-boot-spl-dtb.img"
+		offset = 32K
+	}
+
+	partition u-boot-dtb {
+		in-partition-table = "no"
+		image = "u-boot.itb"
+		offset = 8M
+		size = 30M
+	}
+
+	partition rootfs {
+		partition-type = 0x83
+		image = "rootfs.ext4"
+	}
+}

board/friendlyarm/nanopi-m4/post-build.sh

@@ -0,0 +1,8 @@
+#!/bin/sh
+
+MKIMAGE=$HOST_DIR/bin/mkimage
+BOARD_DIR="$(dirname $0)"
+
+$MKIMAGE -n rk3399 -T rksd -d $BINARIES_DIR/u-boot-spl-dtb.bin $BINARIES_DIR/u-boot-spl-dtb.img
+
+install -m 0644 -D $BOARD_DIR/extlinux.conf $TARGET_DIR/boot/extlinux/extlinux.conf

board/friendlyarm/nanopi-m4/readme.txt

@@ -0,0 +1,45 @@
+Intro
+=====
+
+NanoPi M4 is a RK3399 SoC based ARM board.
+
+Wiki: https://wiki.amarulasolutions.com/bsp/rockchip/rk3399/nanopi_m4.html
+
+Build
+=====
+
+Run NanoPi M4 configuration
+
+  $ make nanopi_m4_defconfig
+
+To build, run make command.
+
+  $ make
+
+Files created in output directory
+=================================
+output/images/
+├── bl31.bin
+├── Image
+├── rk3399-nanopi-m4.dtb
+├── rootfs.ext2
+├── rootfs.ext4 -> rootfs.ext2
+├── rootfs.tar
+├── sdcard.img
+├── u-boot.bin
+├── u-boot.itb
+├── u-boot-spl-dtb.bin
+└── u-boot-spl-dtb.img
+
+Creating bootable SD card:
+=========================
+
+Simply invoke (as root)
+
+  # dd if=output/images/sdcard.img of=/dev/sdX && sync
+
+Where X is your SD card device
+
+Serial console
+--------------
+Baudrate for this board is 1500000

configs/nanopi_m4_defconfig

@@ -0,0 +1,54 @@
+# Architecture
+BR2_aarch64=y
+BR2_cortex_a72_a53=y
+
+# Linux headers same as kernel, a 5.1 series
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_1=y
+
+# Firmware
+BR2_TARGET_ARM_TRUSTED_FIRMWARE=y
+BR2_TARGET_ARM_TRUSTED_FIRMWARE_CUSTOM_GIT=y
+BR2_TARGET_ARM_TRUSTED_FIRMWARE_CUSTOM_REPO_URL="https://github.com/ARM-software/arm-trusted-firmware"
+BR2_TARGET_ARM_TRUSTED_FIRMWARE_CUSTOM_REPO_VERSION="v2.0"
+BR2_TARGET_ARM_TRUSTED_FIRMWARE_PLATFORM="rk3399"
+BR2_TARGET_ARM_TRUSTED_FIRMWARE_BL31=y
+
+# Bootloader
+BR2_TARGET_UBOOT=y
+BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG=y
+BR2_TARGET_UBOOT_CUSTOM_GIT=y
+BR2_TARGET_UBOOT_CUSTOM_REPO_URL="https://github.com/amarula/u-boot-amarula.git"
+BR2_TARGET_UBOOT_CUSTOM_REPO_VERSION="980ca75ae0438b4a1847d044605c492f3c844f88"
+BR2_TARGET_UBOOT_BOARD_DEFCONFIG="nanopi-m4-rk3399"
+BR2_TARGET_UBOOT_NEEDS_DTC=y
+BR2_TARGET_UBOOT_NEEDS_PYLIBFDT=y
+BR2_TARGET_UBOOT_NEEDS_PYELFTOOLS=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="spl/u-boot-spl-dtb.bin"
+
+# Kernel
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.1"
+BR2_LINUX_KERNEL_USE_ARCH_DEFAULT_CONFIG=y
+BR2_LINUX_KERNEL_DTS_SUPPORT=y
+BR2_LINUX_KERNEL_INTREE_DTS_NAME="rockchip/rk3399-nanopi-m4"
+BR2_LINUX_KERNEL_INSTALL_TARGET=y
+BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
+
+# Filesystem
+BR2_TARGET_GENERIC_HOSTNAME="NanoPi M4"
+BR2_TARGET_GENERIC_ISSUE="Welcome to NanoPi M4!"
+BR2_TARGET_ROOTFS_EXT2=y
+BR2_TARGET_ROOTFS_EXT2_4=y
+BR2_PACKAGE_HOST_DOSFSTOOLS=y
+BR2_PACKAGE_HOST_GENIMAGE=y
+BR2_PACKAGE_HOST_MTOOLS=y
+BR2_PACKAGE_HOST_UBOOT_TOOLS=y
+BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"
+BR2_ROOTFS_POST_SCRIPT_ARGS="-c board/friendlyarm/nanopi-m4/genimage.cfg"
+BR2_ROOTFS_POST_BUILD_SCRIPT="board/friendlyarm/nanopi-m4/post-build.sh"