Print at least the vendor for SPI flash chips if the exact chip ID is unknown

Corresponding to flashrom svn r173 and coreboot v2 svn r3032.
Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Ronald G. Minnich <rminnich@gmail.com>

flash.h

@@ -59,10 +59,13 @@ extern struct flashchip flashchips[];
  * entry of each section should be the manufacturer ID, followed by the
  * list of devices from that manufacturer (sorted by device IDs).
  *
- * All LPC/FWH parts (parallel flash) have 8-bit device IDs.
+ * All LPC/FWH parts (parallel flash) have 8-bit device IDs if there is no
+ * continuation code.
  * All SPI parts have 16-bit device IDs.
  */
 
+#define GENERIC_DEVICE_ID	0xffff	/* Only match the vendor ID */
+
 #define ALLIANCE_ID		0x52	/* Alliance Semiconductor */
 
 #define AMD_ID			0x01	/* AMD */

flashchips.c

@@ -185,5 +185,13 @@ struct flashchip flashchips[] = {
 	 probe_jedec,	erase_chip_jedec, write_49f002},
 	{"S29C31004T", 	SYNCMOS_ID, 	S29C31004T,	512, 128,
 	 probe_jedec,	erase_chip_jedec, write_49f002},
+	{"EON unknown SPI chip", EON_ID_NOPREFIX, GENERIC_DEVICE_ID,	0, 0,
+	 probe_spi,	NULL,	NULL},
+	{"MX unknown SPI chip",	MX_ID,	GENERIC_DEVICE_ID,	0, 0,
+	 probe_spi,	NULL,	NULL},
+	{"SST unknown SPI chip",	SST_ID,	GENERIC_DEVICE_ID,	0, 0,
+	 probe_spi,	NULL,	NULL},
+	{"ST unknown SPI chip",	ST_ID,	GENERIC_DEVICE_ID,	0, 0,
+	 probe_spi,	NULL,	NULL},
 	{NULL,}
 };

spi.c

@@ -262,14 +262,19 @@ int probe_spi(struct flashchip *flash)
 		manuf_id = readarr[0];
 		model_id = (readarr[1] << 8) | readarr[2];
 		printf_debug("%s: id1 0x%x, id2 0x%x\n", __FUNCTION__, manuf_id, model_id);
-		if (manuf_id == flash->manufacture_id && model_id == flash->model_id) {
-			/* Print the status register before erase to tell the
+		if (manuf_id == flash->manufacture_id &&
+		    model_id == flash->model_id) {
+			/* Print the status register to tell the
 			 * user about possible write protection.
 			 */
 			generic_spi_prettyprint_status_register(flash);
 
 			return 1;
 		}
+		/* Test if this is a pure vendor match. */
+		if (manuf_id == flash->manufacture_id &&
+		    GENERIC_DEVICE_ID == flash->model_id)
+			return 1;
 	}
 
 	return 0;