Add board-enable code for the Shuttle AK38N

FYI, this board can only decode 256 KB chips (not 512 KB ones) unfortunately.
The highest address line (A18) is not connected on this board.

The it8705f_write_enable() is kept generic enough so it can be reused for other
board-enables, possibly in the board_biostar_p4m80_m4() for example, but that
shouldn't be touched for now, unless someone can test the code.

Corresponding to flashrom svn r616.
Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de>
Acked-by: Luc Verhaegen <libv@skynet.be>

board_enable.c

@@ -719,6 +719,23 @@ static int board_soyo_sy_7vca(const char *name)
 	return 0;
 }
 
+static int it8705f_write_enable(uint8_t port, const char *name)
+{
+	enter_conf_mode_ite(port);
+	sio_mask(port, 0x24, 0x04, 0x04); /* Flash ROM I/F Writes Enable */
+	exit_conf_mode_ite(port);
+
+	return 0;
+}
+
+/**
+ * Suited for Shuttle AK38N: VIA KT333CF + VIA VT8235 + ITE IT8705F
+ */
+static int it8705f_write_enable_2e(const char *name)
+{
+	return it8705f_write_enable(0x2e, name);
+}
+
 /**
  * Find the runtime registers of an SMSC Super I/O, after verifying its
  * chip ID.
@@ -842,6 +859,7 @@ struct board_pciid_enable board_pciid_enables[] = {
 	{0x1106, 0x0571, 0x1462, 0x7120,       0,      0,      0,      0, "msi",        "kt4v",        "MSI",         "MS-6712 (KT4V)",     board_msi_kt4v},
 	{0x8086, 0x2658, 0x1462, 0x7046,  0x1106, 0x3044, 0x1462, 0x046d, NULL,         NULL,          "MSI",         "MS-7046",            ich6_gpio19_raise},
 	{0x10de, 0x005e,      0,      0,       0,      0,      0,      0, "msi",        "k8n-neo3",    "MSI",         "MS-7135 (K8N Neo3)", w83627thf_gpio4_4_raise_4e},
+	{0x1106, 0x3104, 0x1297, 0xa238,  0x1106, 0x3059, 0x1297, 0xc063, NULL,         NULL,          "Shuttle",     "AK38N",              it8705f_write_enable_2e},
 	{0x1106, 0x3038, 0x0925, 0x1234,  0x1106, 0x3058, 0x15DD, 0x7609, NULL,         NULL,          "Soyo",        "SY-7VCA",            board_soyo_sy_7vca},
 	{0x8086, 0x1076, 0x8086, 0x1176,  0x1106, 0x3059, 0x10f1, 0x2498, NULL,         NULL,          "Tyan",        "S2498 (Tomcat K7M)", board_asus_a7v8x_mx},
 	{0x1106, 0x0314, 0x1106, 0xaa08,  0x1106, 0x3227, 0x1106, 0xAA08, NULL,         NULL,          "VIA",         "EPIA-CN",            board_via_epia_sp},