diff --git a/flash.h b/flash.h
new file mode 100644
index 0000000..3b763a7
--- /dev/null
+++ b/flash.h
@@ -0,0 +1,44 @@
+#include <sys/io.h>
+#include <unistd.h>
+
+struct flashchip {
+	char * name;
+	int manufacture_id;
+	int model_id;
+
+	char * virt_addr;
+	int total_size;
+	int page_size;
+
+	int (*probe) (struct flashchip * flash);
+	int (*erase) (struct flashchip * flash);
+	int (*write) (struct flashchip * flash, char * buf);
+};
+
+#define AMD_ID            0x01
+#define AM_29F040B        0xA4
+
+#define ATMEL_ID          0x1F    /* Winbond Manufacture ID code	*/
+#define AT_29C040A        0xA4    /* Winbond w29c020c device code*/
+
+#define MX_ID             0xC2
+#define MX_29F002         0xB0
+
+#define SST_ID            0xBF	/* SST Manufacturer ID[B code	*/
+#define SST_29EE020A      0x10	/* SST 29EE020 device code	*/
+#define SST_28SF040       0x04    /* SST 29EE040 device code	*/
+
+#define WINBOND_ID        0xDA	/* Winbond Manufacture ID code	*/
+#define W_29C020C         0x45	/* Winbond w29c020c device code*/
+
+extern int probe_28sf040 (struct flashchip * flash);
+extern int erase_28sf040 (struct flashchip * flash);
+extern int write_28sf040 (struct flashchip * flash, char * buf);
+
+extern int probe_29f040b (struct flashchip * flash);
+extern int erase_29f040b (struct flashchip * flash);
+extern int write_29f040b (struct flashchip * flash, char * buf);
+
+extern int probe_29f002 (struct flashchip * flash);
+extern int erase_29f002 (struct flashchip * flash);
+extern int write_29f002 (struct flashchip * flash, char * buf);