diff --git a/00-README-DEBUG b/00-README-DEBUG
new file mode 100644
index 00000000..d6ee689b
--- /dev/null
+++ b/00-README-DEBUG
@@ -0,0 +1,15 @@
+Run OpenCD:
+~/install/bin/openocd -s ~/install/share/openocd/scripts/ -f interface/cmsis-dap.cfg -f target/at32f4xx.cfg
+
+In another window, run GDB (note elf image name is hardcoded in the script):
+gdb-multiarch -x scripts/gdb-commands
+
+Telnet commands:
+telnet localhost 4444
+mdb 0x1fffc000 512 # Read USD on 435
+mdb 0x1ffff800 512 # Read USD on 415
+at32f4xx mass_erase
+at32f4xx usd_erase        # NB. Enables RDP!
+at32f4xx usd_write 0 0xa5 # Disable RDP
+flash write_image [erase] flashfloppy/out/at32f435/debug/floppy/target.hex
+reset run|halt|init
diff --git a/scripts/gdb-commands b/scripts/gdb-commands
new file mode 100644
index 00000000..c2fb16eb
--- /dev/null
+++ b/scripts/gdb-commands
@@ -0,0 +1,6 @@
+file /home/keir/flashfloppy/out/at32f435/debug/floppy/target.elf
+target extended-remote localhost:3333
+# Reset the target and call its init script
+monitor reset init
+# Halt the target. The init script should halt the target, but just in case
+monitor halt