diff --git a/board/radxa/zero3-rk3566/zero3-rk3566.c b/board/radxa/zero3-rk3566/zero3-rk3566.c
new file mode 100644
index 0000000..cf30c4e
--- /dev/null
+++ b/board/radxa/zero3-rk3566/zero3-rk3566.c
@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <adc.h>
+#include <env.h>
+
+#define HW_ID_CHANNEL	1
+
+struct board_model {
+	unsigned int low;
+	unsigned int high;
+	const char *fdtfile;
+};
+
+static const struct board_model board_models[] = {
+	{ 230, 270, "rockchip/rk3566-radxa-zero-3w.dtb" },
+	{ 400, 450, "rockchip/rk3566-radxa-zero-3e.dtb" },
+};
+
+static const struct board_model *get_board_model(void)
+{
+	unsigned int val;
+	int i, ret;
+
+	ret = adc_channel_single_shot("saradc@fe720000", HW_ID_CHANNEL, &val);
+	if (ret)
+		return NULL;
+
+	for (i = 0; i < ARRAY_SIZE(board_models); i++) {
+		unsigned int min = board_models[i].low;
+		unsigned int max = board_models[i].high;
+
+		if (min <= val && val <= max)
+			return &board_models[i];
+	}
+
+	return NULL;
+}
+
+int rk_board_late_init(void)
+{
+	const struct board_model *model = get_board_model();
+
+	if (model)
+		env_set("fdtfile", model->fdtfile);
+
+	return 0;
+}
+
+int board_fit_config_name_match(const char *name)
+{
+	const struct board_model *model = get_board_model();
+
+	if (model && !strcmp(name, model->fdtfile))
+		return 0;
+
+	return -EINVAL;
+}