initial buildroot for linux 5.15

board/embest/riotboard/genimage.cfg

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+image sdcard.img {
+	hdimage {
+	}
+
+	partition u-boot {
+		in-partition-table = "no"
+		image = "u-boot.imx"
+		offset = 1K
+	}
+
+	partition rootfs {
+		partition-type = 0x83
+		image = "rootfs.ext2"
+		offset = 1M
+		size = 60M
+	}
+}

board/embest/riotboard/readme.txt

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+Buildroot for Embest RIoTboard
+==============================
+
+This is a small development board, based on Freescale IMX6 Solo SoC
+(single core ARM Cortex-A9).
+
+More details about the board can be found at:
+
+  http://www.embest-tech.com/riotboard
+
+1. Compiling buildroot
+----------------------
+
+$ make riotboard_defconfig
+$ make
+
+2. Installing buildroot
+-----------------------
+
+Prepare an SD-card and plug it into your card reader. Always double
+check the block device before writing to it, as writing to the wrong
+block device can cause irrecoverable data loss. Now you can write the
+image to your SD-card:
+
+sudo dd if=output/images/sdcard.img of=/dev/<sdcard-block-device> bs=1M
+
+3. Running buildroot
+--------------------
+
+Position the board so you can read the label "RIoTboard" on the right
+side of SW1 DIP switches. Configure the SW1 swiches like this:
+
+1   0  1   0   0  1   0  1
+ON OFF ON OFF OFF ON OFF ON
+
+Now plug your prepared SD-card in slot J6. Connect a serial console
+(115200, 8, N, 1) to header J18. Connect a 5V/1A power supply to the
+board and enjoy.

board/embest/riotboard/rootfs_overlay/boot/extlinux/extlinux.conf

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+default buildroot
+
+label buildroot
+kernel /boot/zImage
+devicetree /boot/imx6dl-riotboard.dtb
+append console=ttymxc1,115200 root=/dev/mmcblk1p1 rw