initial buildroot for linux 5.15

board/radxa/rockpi-n8/readme.txt

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+RADXA ROCKPI-N8
+================
+https://wiki.radxa.com/RockpiN8
+
+Build:
+======
+  $ make rock_pi_n8_defconfig
+  $ make
+
+Files created in output directory
+=================================
+
+output/images
+.
+├── boot.vfat
+├── extlinux
+├── idbloader.img
+├── rk3288-rock-pi-n8.dtb
+├── rootfs.ext2
+├── rootfs.ext4 -> rootfs.ext2
+├── rootfs.tar
+├── sdcard.img
+├── u-boot.bin
+├── u-boot-dtb.bin
+├── u-boot-dtb.img
+└── zImage
+
+Creating bootable SD card:
+==========================
+
+Simply invoke (as root)
+
+sudo dd if=output/images/sdcard.img of=/dev/sdX && sync
+
+Where X is your SD card device.
+
+Booting:
+========
+
+Serial console:
+---------------
+RockPi-N8 has a 40-pin GPIO header. The pin layout is as follows:
+
+pin 6:  gnd
+pin 8:  tx
+pin 10: rx
+
+Baudrate for this board is 115200.
+
+The boot order on rockpi-n8 is emmc, sd. If emmc contains a valid Image, the board
+always boots from emmc. To boot from SD, erase emmc as per the guide:
+
+https://wiki.amarulasolutions.com/bsp/setup/rockchip/rk3399_emmc.html
+
+Login:
+------
+Enter 'root' as login user, and the prompt is ready.
+
+wiki link:
+----------
+https://wiki.amarulasolutions.com/bsp/rockchip/rk3288/rock-pi-n8.html