initial buildroot for linux 5.15

board/friendlyarm/nanopi-neo/boot.cmd

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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-h3-nanopi-neo.dtb
+
+bootz $kernel_addr_r - $fdt_addr_r

board/friendlyarm/nanopi-neo/genimage.cfg

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+image boot.vfat {
+	vfat {
+		files = {
+			"zImage",
+			"sun8i-h3-nanopi-neo.dtb",
+			"boot.scr"
+		}
+	}
+
+	size = 10M
+}
+
+image sdcard.img {
+	hdimage {
+	}
+
+	partition u-boot {
+		in-partition-table = "no"
+		image = "u-boot-sunxi-with-spl.bin"
+		offset = 8K
+		size = 1016K # 1MB - 8KB
+	}
+
+	partition boot {
+		partition-type = 0xC
+		bootable = "true"
+		image = "boot.vfat"
+	}
+
+	partition rootfs {
+		partition-type = 0x83
+		image = "rootfs.ext4"
+	}
+}

board/friendlyarm/nanopi-neo/readme.txt

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+Intro
+=====
+
+The instructions herein are valid for the FriendlyARM NanoPi NEO,
+both the 256MiB and 512MiB versions. They should also work for the
+NanoPi NEO Air, but this is untested so far.
+
+The FriendlyARM Nanopi NEO is a 4x4cm² board with an Allwiner H3 SoC:
+  - quad-core Cortex-A7 @1.2GHz
+  - 256 or 512MiB of DDR
+  - uSDCard as only storage option
+  - 3x USB 2.0 host (one socket, two on expansion pin-holes)
+  - 1x USB 2.0 OTG (also used as power source)
+  - 10/100 ethernet MAC
+  - GPIOs, SPI, I2c...
+
+Support for the Nanopi NEO in U-Boot and Linux is very recent, so only
+core, basic features are available.
+
+Unfortunately, support for the ethernet MAC and the USB OTG are not
+yet upstream, but are being actively worked on.
+
+
+How to build
+============
+
+    $ make friendlyarm_nanopi_neo_defconfig
+    $ make
+
+Note: you will need access to the internet to download the required
+sources.
+
+You will then obtain an image ready to be written to your micro SDcard:
+
+    $ dd if=output/images/sdcard.img of=/dev/sdX bs=1M
+
+Notes:
+  - replace 'sdX' with the actual device with your micro SDcard,
+  - you may need to be root to do that (use 'sudo').
+
+Insert the micro SDcard in your NanoPi NEO and power it up. The console
+is on the serial line, 115200 8N1.