diff --git a/sw/.gitignore b/sw/.gitignore
index a40f733..3f8a90d 100644
--- a/sw/.gitignore
+++ b/sw/.gitignore
@@ -1,3 +1,4 @@
+puzzlefw_sdcard.img
 devicetree/devicetree.dtb
 buildroot_overlay/opt/puzzlefw/bin/puzzlecmd
 buildroot_overlay/opt/puzzlefw/bin/remotectl
diff --git a/sw/23_sdcard_image.sh b/sw/23_sdcard_image.sh
new file mode 100755
index 0000000..64b8c7a
--- /dev/null
+++ b/sw/23_sdcard_image.sh
@@ -0,0 +1,28 @@
+#!/bin/bash
+
+set -e
+
+. script_env
+
+# Delete stale output file.
+rm -f "$SDCARD_IMG"
+
+# Create empty SD card image.
+dd if=/dev/zero of="$SDCARD_IMG" bs=1M seek=507 count=1
+
+# Create partition table.
+cat <<END | /sbin/sfdisk "$SDCARD_IMG"
+label: dos
+start=8192, size=512000, type=e
+start=524288, size=512000, type=83
+END
+
+# Create DOS partition.
+/sbin/mkdosfs -F 16 --offset 8192 ${SDCARD_IMG} 256000
+
+# Copy files to SD card.
+mcopy -i ${SDCARD_IMG}@@4M ${SDCARD_DIR}/* ::
+
+# Create empty ext4 partition for configuration.
+/sbin/mke2fs -t ext4 -b 4096 -E offset=$((524288 * 512)) ${SDCARD_IMG} 256000k
+
diff --git a/sw/script_env b/sw/script_env
index a472aaa..2a72fb9 100644
--- a/sw/script_env
+++ b/sw/script_env
@@ -16,6 +16,7 @@ LINUX_DIR="linux-xlnx"
 
 BOOTIMG_DIR="boot_img"
 SDCARD_DIR="sdcard_files"
+SDCARD_IMG="puzzlefw_sdcard.img"
 
 XSA_FILE="../fpga/redpitaya_puzzlefw.xsa"
 FIRMWARE_FILES="../fpga/puzzlefw_top.bit.bin ../fpga/puzzlefw_top_4ch.bit.bin"