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diff --git a/qemu/roms/ipxe/src/include/ipxe/threewire.h b/qemu/roms/ipxe/src/include/ipxe/threewire.h
new file mode 100644
index 000000000..b5513ecdd
--- /dev/null
+++ b/qemu/roms/ipxe/src/include/ipxe/threewire.h
@@ -0,0 +1,118 @@
+#ifndef _IPXE_THREEWIRE_H
+#define _IPXE_THREEWIRE_H
+
+/** @file
+ *
+ * Three-wire serial interface
+ *
+ * The Atmel three-wire interface is a subset of the (newer) SPI
+ * interface, and is implemented here as a layer on top of the SPI
+ * support.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <ipxe/spi.h>
+#include <limits.h>
+
+/**
+ * @defgroup tcmds Three-wire commands
+ * @{
+ */
+
+/** Read data from memory array */
+#define THREEWIRE_READ 0x6
+
+/** Write data to memory array */
+#define THREEWIRE_WRITE 0x5
+
+/** Write enable */
+#define THREEWIRE_EWEN 0x4
+
+/** Address to be used for write enable command */
+#define THREEWIRE_EWEN_ADDRESS INT_MAX
+
+/** Time to wait for write cycles to complete
+ *
+ * This is sufficient for AT93C46/AT93C56 devices, but may need to be
+ * increased in future when other devices are added.
+ */
+#define THREEWIRE_WRITE_MDELAY 10
+
+/** @} */
+
+extern int threewire_read ( struct nvs_device *nvs, unsigned int address,
+			    void *data, size_t len );
+extern int threewire_write ( struct nvs_device *nvs, unsigned int address,
+			     const void *data, size_t len );
+extern int threewire_detect_address_len ( struct spi_device *device );
+
+/**
+ * @defgroup tdevs Three-wire device types
+ * @{
+ */
+
+static inline __attribute__ (( always_inline )) void
+init_at93cx6 ( struct spi_device *device, unsigned int organisation ) {
+	device->nvs.word_len_log2 = ( ( organisation == 8 ) ? 0 : 1 );
+	device->nvs.block_size = 1;
+	device->command_len = 3,
+	device->nvs.read = threewire_read;
+	device->nvs.write = threewire_write;
+}
+
+/**
+ * Initialise Atmel AT93C06 serial EEPROM
+ *
+ * @v device		SPI device
+ * @v organisation	Word organisation (8 or 16)
+ */
+static inline __attribute__ (( always_inline )) void
+init_at93c06 ( struct spi_device *device, unsigned int organisation ) {
+	device->nvs.size = ( 256 / organisation );
+	device->address_len = ( ( organisation == 8 ) ? 7 : 6 );
+	init_at93cx6 ( device, organisation );
+}
+
+/**
+ * Initialise Atmel AT93C46 serial EEPROM
+ *
+ * @v device		SPI device
+ * @v organisation	Word organisation (8 or 16)
+ */
+static inline __attribute__ (( always_inline )) void
+init_at93c46 ( struct spi_device *device, unsigned int organisation ) {
+	device->nvs.size = ( 1024 / organisation );
+	device->address_len = ( ( organisation == 8 ) ? 7 : 6 );
+	init_at93cx6 ( device, organisation );
+}
+
+/**
+ * Initialise Atmel AT93C56 serial EEPROM
+ *
+ * @v device		SPI device
+ * @v organisation	Word organisation (8 or 16)
+ */
+static inline __attribute__ (( always_inline )) void
+init_at93c56 ( struct spi_device *device, unsigned int organisation ) {
+	device->nvs.size = ( 2048 / organisation );
+	device->address_len = ( ( organisation == 8 ) ? 9 : 8 );
+	init_at93cx6 ( device, organisation );
+}
+
+/**
+ * Initialise Atmel AT93C66 serial EEPROM
+ *
+ * @v device		SPI device
+ * @v organisation	Word organisation (8 or 16)
+ */
+static inline __attribute__ (( always_inline )) void
+init_at93c66 ( struct spi_device *device, unsigned int organisation ) {
+	device->nvs.size = ( 4096 / organisation );
+	device->address_len = ( ( organisation == 8 ) ? 9 : 8 );
+	init_at93cx6 ( device, organisation );
+}
+
+/** @} */
+
+#endif /* _IPXE_THREEWIRE_H */