diff --git a/arch/arm/boards/sama5d27-som1/Makefile b/arch/arm/boards/sama5d27-som1/Makefile
index b08c4a9..092c31d 100644
--- a/arch/arm/boards/sama5d27-som1/Makefile
+++ b/arch/arm/boards/sama5d27-som1/Makefile
@@ -1 +1,2 @@
 lwl-y += lowlevel.o
+obj-y += board.o
diff --git a/arch/arm/boards/sama5d27-som1/board.c b/arch/arm/boards/sama5d27-som1/board.c
new file mode 100644
index 0000000..00c0e92
--- /dev/null
+++ b/arch/arm/boards/sama5d27-som1/board.c
@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <common.h>
+#include <linux/sizes.h>
+#include <init.h>
+#include <asm/memory.h>
+#include <bbu.h>
+#include <bootsource.h>
+#include <of.h>
+
+static int ek_device_init(void)
+{
+	int flags_sd = 0, flags_usd = 0;
+	if (!of_machine_is_compatible("atmel,sama5d27-som1-ek"))
+		return 0;
+
+	if (bootsource_get() == BOOTSOURCE_MMC) {
+		if (bootsource_get_instance() == 0) {
+			flags_sd = BBU_HANDLER_FLAG_DEFAULT;
+			of_device_enable_path("/chosen/environment-sd");
+		} else {
+			flags_usd = BBU_HANDLER_FLAG_DEFAULT;
+			of_device_enable_path("/chosen/environment-microsd");
+		}
+	} else {
+		of_device_enable_path("/chosen/environment-qspi");
+	}
+
+	bbu_register_std_file_update("SD", flags_sd, "/mnt/mmc0.0/barebox.bin",
+				     filetype_arm_barebox);
+	bbu_register_std_file_update("microSD", flags_usd, "/mnt/mmc1.0/barebox.bin",
+				     filetype_arm_barebox);
+	return 0;
+}
+device_initcall(ek_device_init);
diff --git a/arch/arm/dts/at91-sama5d27_som1_ek.dts b/arch/arm/dts/at91-sama5d27_som1_ek.dts
index b9042d1..befee89 100644
--- a/arch/arm/dts/at91-sama5d27_som1_ek.dts
+++ b/arch/arm/dts/at91-sama5d27_som1_ek.dts
@@ -8,9 +8,24 @@
 
 / {
 	chosen {
-		environment {
+		environment-qspi {
 			compatible = "barebox,environment";
 			device-path = &barebox_env;
+			status = "disabled";
+		};
+
+		environment-sd {
+			compatible = "barebox,environment";
+			device-path = &sdmmc0;
+			file-path = "barebox.env";
+			status = "disabled";
+		};
+
+		environment-microsd {
+			compatible = "barebox,environment";
+			device-path = &sdmmc1;
+			file-path = "barebox.env";
+			status = "disabled";
 		};
 	};
 };
diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig
index 8584dcd..52eefc7 100644
--- a/arch/arm/mach-at91/Kconfig
+++ b/arch/arm/mach-at91/Kconfig
@@ -609,6 +609,7 @@
 	select OFDEVICE
 	select MCI_ATMEL_SDHCI_PBL
 	select COMMON_CLK_OF_PROVIDER
+	select FS_FAT_WRITE if MCI_ATMEL_SDHCI && FS_FAT && ENV_HANDLING
 	help
 	  Select this if you are using Microchip's sama5d27 SoM evaluation kit